source: trunk/kernel/kern/process.c @ 469

Last change on this file since 469 was 469, checked in by alain, 3 years ago

1) Introduce the libsemaphore library.
2) Introduce a small libmath library, required by the "fft" application..
3) Introduce the multithreaded "fft" application.
4) Fix a bad synchronisation bug in the Copy-On-Write mechanism.

File size: 72.9 KB
Line 
1/*
2 * process.c - process related management
3 *
4 * Authors  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *          Mohamed Lamine Karaoui (2015)
6 *          Alain Greiner (2016,2017,2018)
7 *
8 * Copyright (c) UPMC Sorbonne Universites
9 *
10 * This file is part of ALMOS-MKH.
11 *
12 * ALMOS-MKH is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2.0 of the License.
15 *
16 * ALMOS-MKH is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
23 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <kernel_config.h>
27#include <hal_kernel_types.h>
28#include <hal_remote.h>
29#include <hal_uspace.h>
30#include <hal_irqmask.h>
31#include <errno.h>
32#include <printk.h>
33#include <memcpy.h>
34#include <bits.h>
35#include <kmem.h>
36#include <page.h>
37#include <vmm.h>
38#include <vfs.h>
39#include <core.h>
40#include <thread.h>
41#include <chdev.h>
42#include <list.h>
43#include <string.h>
44#include <scheduler.h>
45#include <remote_spinlock.h>
46#include <dqdt.h>
47#include <cluster.h>
48#include <ppm.h>
49#include <boot_info.h>
50#include <process.h>
51#include <elf.h>
52#include <syscalls.h>
53#include <shared_syscalls.h>
54
55//////////////////////////////////////////////////////////////////////////////////////////
56// Extern global variables
57//////////////////////////////////////////////////////////////////////////////////////////
58
59extern process_t           process_zero;     // allocated in kernel_init.c
60extern chdev_directory_t   chdev_dir;        // allocated in kernel_init.c
61
62//////////////////////////////////////////////////////////////////////////////////////////
63// Process initialisation related functions
64//////////////////////////////////////////////////////////////////////////////////////////
65
66///////////////////////////
67process_t * process_alloc()
68{
69        kmem_req_t   req;
70
71    req.type  = KMEM_PROCESS;
72        req.size  = sizeof(process_t);
73        req.flags = AF_KERNEL;
74
75    return (process_t *)kmem_alloc( &req );
76}
77
78////////////////////////////////////////
79void process_free( process_t * process )
80{
81    kmem_req_t  req;
82
83        req.type = KMEM_PROCESS;
84        req.ptr  = process;
85        kmem_free( &req );
86}
87
88/////////////////////////////////////////////////
89void process_reference_init( process_t * process,
90                             pid_t       pid,
91                             xptr_t      parent_xp )
92{
93    cxy_t       parent_cxy;
94    process_t * parent_ptr;
95    xptr_t      stdin_xp;
96    xptr_t      stdout_xp;
97    xptr_t      stderr_xp;
98    uint32_t    stdin_id;
99    uint32_t    stdout_id;
100    uint32_t    stderr_id;
101    error_t     error;
102    uint32_t    txt_id;
103    char        rx_path[40];
104    char        tx_path[40];
105    xptr_t      file_xp;
106    xptr_t      chdev_xp;
107    chdev_t *   chdev_ptr;
108    cxy_t       chdev_cxy;
109    pid_t       parent_pid;
110
111    // get parent process cluster and local pointer
112    parent_cxy = GET_CXY( parent_xp );
113    parent_ptr = GET_PTR( parent_xp );
114
115    // get parent_pid
116    parent_pid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
117
118#if DEBUG_PROCESS_REFERENCE_INIT
119uint32_t cycle = (uint32_t)hal_get_cycles();
120if( DEBUG_PROCESS_REFERENCE_INIT )
121printk("\n[DBG] %s : thread %x in process %x enter to initalialize process %x / cycle %d\n",
122__FUNCTION__, CURRENT_THREAD->trdid, parent_pid , pid , cycle );
123#endif
124
125    // initialize PID, REF_XP, PARENT_XP, and STATE
126        process->pid        = pid;
127    process->ref_xp     = XPTR( local_cxy , process );
128    process->owner_xp   = XPTR( local_cxy , process );
129    process->parent_xp  = parent_xp;
130    process->term_state = 0;
131
132    // initialize vmm as empty
133    error = vmm_init( process );
134    assert( (error == 0) , __FUNCTION__ , "cannot initialize VMM\n" );
135 
136#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
137cycle = (uint32_t)hal_get_cycles();
138if( DEBUG_PROCESS_REFERENCE_INIT )
139printk("\n[DBG] %s : thread %x in process %x / vmm empty for process %x / cycle %d\n", 
140__FUNCTION__, CURRENT_THREAD->trdid, parent_pid , cycle );
141#endif
142
143    // initialize fd_array as empty
144    process_fd_init( process );
145
146    // define the stdin/stdout/stderr pseudo files <=> select a TXT terminal.
147    if( (pid == 1) || (parent_pid == 1)) // INIT or KSH process
148    {
149        // allocate a TXT channel
150        if( pid == 1 )  txt_id = 0;                     // INIT
151        else            txt_id = process_txt_alloc();   // KSH
152
153        // attach process to TXT
154        process_txt_attach( process , txt_id ); 
155
156#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
157cycle = (uint32_t)hal_get_cycles();
158if( DEBUG_PROCESS_REFERENCE_INIT )
159printk("\n[DBG] %s : thread %x in process %x / process %x attached to TXT%d / cycle %d\n", 
160__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, txt_id, cycle );
161#endif
162
163
164
165        // build path to TXT_RX[i] and TXT_TX[i] chdevs
166        snprintf( rx_path , 40 , "/dev/external/txt%d_rx", txt_id );
167        snprintf( tx_path , 40 , "/dev/external/txt%d_tx", txt_id );
168
169        // create stdin pseudo file         
170        error = vfs_open( process,
171                           rx_path,
172                           O_RDONLY, 
173                           0,                // FIXME chmod
174                           &stdin_xp, 
175                           &stdin_id );
176
177        assert( (error == 0) , __FUNCTION__ , "cannot open stdin pseudo file" );
178        assert( (stdin_id == 0) , __FUNCTION__ , "stdin index must be 0" );
179
180#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
181cycle = (uint32_t)hal_get_cycles();
182if( DEBUG_PROCESS_REFERENCE_INIT )
183printk("\n[DBG] %s : thread %x in process %x / stdin open for process %x / cycle %d\n", 
184__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, cycle );
185#endif
186
187        // create stdout pseudo file         
188        error = vfs_open( process,
189                           tx_path,
190                           O_WRONLY, 
191                           0,                // FIXME chmod
192                           &stdout_xp, 
193                           &stdout_id );
194
195        assert( (error == 0) , __FUNCTION__ , "cannot open stdout pseudo file" );
196        assert( (stdout_id == 1) , __FUNCTION__ , "stdout index must be 1" );
197
198#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
199cycle = (uint32_t)hal_get_cycles();
200if( DEBUG_PROCESS_REFERENCE_INIT )
201printk("\n[DBG] %s : thread %x in process %x / stdout open for process %x / cycle %d\n", 
202__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, cycle );
203#endif
204
205        // create stderr pseudo file         
206        error = vfs_open( process,
207                           tx_path,
208                           O_WRONLY, 
209                           0,                // FIXME chmod
210                           &stderr_xp, 
211                           &stderr_id );
212
213        assert( (error == 0) , __FUNCTION__ , "cannot open stderr pseudo file" );
214        assert( (stderr_id == 2) , __FUNCTION__ , "stderr index must be 2" );
215
216#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
217cycle = (uint32_t)hal_get_cycles();
218if( DEBUG_PROCESS_REFERENCE_INIT )
219printk("\n[DBG] %s : thread %x in process %x / stderr open for process %x / cycle %d\n", 
220__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, cycle );
221#endif
222
223    }
224    else                                            // normal user process
225    {
226        // get extended pointer on stdin pseudo file in parent process
227        file_xp = (xptr_t)hal_remote_lwd( XPTR( parent_cxy , &parent_ptr->fd_array.array[0] ) );
228
229        // get extended pointer on parent process TXT chdev
230        chdev_xp = chdev_from_file( file_xp );
231 
232        // get cluster and local pointer on chdev
233        chdev_cxy = GET_CXY( chdev_xp );
234        chdev_ptr = GET_PTR( chdev_xp );
235 
236        // get TXT terminal index
237        txt_id = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
238
239        // attach process to TXT[txt_id]
240        process_txt_attach( process , txt_id ); 
241
242        // copy all open files from parent process fd_array to this process
243        process_fd_remote_copy( XPTR( local_cxy , &process->fd_array ),
244                                XPTR( parent_cxy , &parent_ptr->fd_array ) );
245    }
246
247    // initialize specific inodes root and cwd
248    process->vfs_root_xp = (xptr_t)hal_remote_lwd( XPTR( parent_cxy,
249                                                         &parent_ptr->vfs_root_xp ) );
250    process->vfs_cwd_xp  = (xptr_t)hal_remote_lwd( XPTR( parent_cxy,
251                                                         &parent_ptr->vfs_cwd_xp ) );
252    vfs_inode_remote_up( process->vfs_root_xp );
253    vfs_inode_remote_up( process->vfs_cwd_xp );
254
255    remote_rwlock_init( XPTR( local_cxy , &process->cwd_lock ) );
256
257#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
258cycle = (uint32_t)hal_get_cycles();
259if( DEBUG_PROCESS_REFERENCE_INIT )
260printk("\n[DBG] %s : thread %x / fd_array for process %x / cycle %d\n", 
261__FUNCTION__ , CURRENT_THREAD , pid , cycle );
262#endif
263
264    // reset children list root
265    xlist_root_init( XPTR( local_cxy , &process->children_root ) );
266    process->children_nr     = 0;
267    remote_spinlock_init( XPTR( local_cxy , &process->children_lock ) );
268
269    // reset semaphore / mutex / barrier / condvar list roots
270    xlist_root_init( XPTR( local_cxy , &process->sem_root ) );
271    xlist_root_init( XPTR( local_cxy , &process->mutex_root ) );
272    xlist_root_init( XPTR( local_cxy , &process->barrier_root ) );
273    xlist_root_init( XPTR( local_cxy , &process->condvar_root ) );
274    remote_spinlock_init( XPTR( local_cxy , &process->sync_lock ) );
275
276    // register new process in the local cluster manager pref_tbl[]
277    lpid_t lpid = LPID_FROM_PID( pid );
278    LOCAL_CLUSTER->pmgr.pref_tbl[lpid] = XPTR( local_cxy , process );
279
280    // register new process descriptor in local cluster manager local_list
281    cluster_process_local_link( process );
282
283    // register new process descriptor in local cluster manager copies_list
284    cluster_process_copies_link( process );
285
286    // reset th_tbl[] array as empty in process descriptor
287    uint32_t i;
288    for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
289        {
290        process->th_tbl[i] = NULL;
291    }
292    process->th_nr  = 0;
293    spinlock_init( &process->th_lock );
294
295        hal_fence();
296
297#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
298cycle = (uint32_t)hal_get_cycles();
299if( DEBUG_PROCESS_REFERENCE_INIT )
300printk("\n[DBG] %s : thread %x exit / process %x / cycle %d\n", 
301__FUNCTION__ , CURRENT_THREAD , pid , cycle );
302#endif
303
304}  // process_reference_init()
305
306/////////////////////////////////////////////////////
307error_t process_copy_init( process_t * local_process,
308                           xptr_t      reference_process_xp )
309{
310    error_t error;
311
312    // get reference process cluster and local pointer
313    cxy_t       ref_cxy = GET_CXY( reference_process_xp );
314    process_t * ref_ptr = GET_PTR( reference_process_xp );
315
316    // initialize PID, REF_XP, PARENT_XP, and STATE
317    local_process->pid        = hal_remote_lw(  XPTR( ref_cxy , &ref_ptr->pid ) );
318    local_process->parent_xp  = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->parent_xp ) );
319    local_process->ref_xp     = reference_process_xp;
320    local_process->owner_xp   = reference_process_xp;
321    local_process->term_state = 0;
322
323#if DEBUG_PROCESS_COPY_INIT
324uint32_t cycle = (uint32_t)hal_get_cycles();
325if( DEBUG_PROCESS_COPY_INIT )
326printk("\n[DBG] %s : thread %x enter for process %x\n",
327__FUNCTION__ , CURRENT_THREAD , local_process->pid );
328#endif
329
330    // reset local process vmm
331    error = vmm_init( local_process );
332    assert( (error == 0) , __FUNCTION__ , "cannot initialize VMM\n");
333
334    // reset process file descriptors array
335        process_fd_init( local_process );
336
337    // reset vfs_root_xp / vfs_bin_xp / vfs_cwd_xp fields
338    local_process->vfs_root_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_root_xp ) );
339    local_process->vfs_bin_xp  = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_bin_xp ) );
340    local_process->vfs_cwd_xp  = XPTR_NULL;
341
342    // reset children list root (not used in a process descriptor copy)
343    xlist_root_init( XPTR( local_cxy , &local_process->children_root ) );
344    local_process->children_nr   = 0;
345    remote_spinlock_init( XPTR( local_cxy , &local_process->children_lock ) );
346
347    // reset children_list (not used in a process descriptor copy)
348    xlist_entry_init( XPTR( local_cxy , &local_process->children_list ) );
349
350    // reset semaphores list root (not used in a process descriptor copy)
351    xlist_root_init( XPTR( local_cxy , &local_process->sem_root ) );
352    xlist_root_init( XPTR( local_cxy , &local_process->mutex_root ) );
353    xlist_root_init( XPTR( local_cxy , &local_process->barrier_root ) );
354    xlist_root_init( XPTR( local_cxy , &local_process->condvar_root ) );
355
356    // reset th_tbl[] array as empty
357    uint32_t i;
358    for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
359        {
360        local_process->th_tbl[i] = NULL;
361    }
362    local_process->th_nr  = 0;
363    spinlock_init( &local_process->th_lock );
364
365    // register new process descriptor in local cluster manager local_list
366    cluster_process_local_link( local_process );
367
368    // register new process descriptor in owner cluster manager copies_list
369    cluster_process_copies_link( local_process );
370
371        hal_fence();
372
373#if DEBUG_PROCESS_COPY_INIT
374cycle = (uint32_t)hal_get_cycles();
375if( DEBUG_PROCESS_COPY_INIT )
376printk("\n[DBG] %s : thread %x exit for process %x\n",
377__FUNCTION__ , CURRENT_THREAD , local_process->pid );
378#endif
379
380    return 0;
381
382} // end process_copy_init()
383
384///////////////////////////////////////////
385void process_destroy( process_t * process )
386{
387    xptr_t      parent_xp;
388    process_t * parent_ptr;
389    cxy_t       parent_cxy;
390    xptr_t      children_lock_xp;
391    xptr_t      children_nr_xp;
392
393    pid_t       pid = process->pid;
394
395        assert( (process->th_nr == 0) , __FUNCTION__ ,
396    "process %x in cluster %x has still active threads", pid , local_cxy );
397
398#if DEBUG_PROCESS_DESTROY
399uint32_t cycle = (uint32_t)hal_get_cycles();
400if( DEBUG_PROCESS_DESTROY )
401printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
402__FUNCTION__ , CURRENT_THREAD , pid , local_cxy , cycle );
403#endif
404
405    // remove process from local_list in local cluster manager
406    cluster_process_local_unlink( process );
407
408    // remove process from copies_list in owner cluster manager
409    cluster_process_copies_unlink( process );
410
411    // remove process from children_list
412    // and release PID if owner cluster
413    if( CXY_FROM_PID( pid ) == local_cxy )
414    {
415        // get pointers on parent process
416        parent_xp  = process->parent_xp;
417        parent_cxy = GET_CXY( parent_xp );
418        parent_ptr = GET_PTR( parent_xp );
419
420        // get extended pointer on children_lock in parent process
421        children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
422        children_nr_xp   = XPTR( parent_cxy , &parent_ptr->children_nr );
423
424        // remove process from children_list
425        remote_spinlock_lock( children_lock_xp );
426        xlist_unlink( XPTR( local_cxy , &process->children_list ) );
427            hal_remote_atomic_add( children_nr_xp , -1 );
428        remote_spinlock_unlock( children_lock_xp );
429
430    // release the process PID to cluster manager
431    cluster_pid_release( pid );
432
433    }
434
435    // FIXME close all open files and update dirty [AG]
436
437    // decrease refcount for bin file, root file and cwd file
438        if( process->vfs_bin_xp  != XPTR_NULL ) vfs_file_count_down( process->vfs_bin_xp );
439        if( process->vfs_root_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_root_xp );
440        if( process->vfs_cwd_xp  != XPTR_NULL ) vfs_file_count_down( process->vfs_cwd_xp );
441
442    // Destroy VMM
443    vmm_destroy( process );
444
445    // release memory allocated to process descriptor
446    process_free( process );
447
448#if DEBUG_PROCESS_DESTROY
449cycle = (uint32_t)hal_get_cycles();
450if( DEBUG_PROCESS_DESTROY )
451printk("\n[DBG] %s : thread %x exit / destroyed process %x in cluster %x / cycle %d\n",
452__FUNCTION__ , CURRENT_THREAD , pid, local_cxy, cycle );
453#endif
454
455}  // end process_destroy()
456
457/////////////////////////////////////////////////
458char * process_action_str( uint32_t action_type )
459{
460    if     ( action_type == BLOCK_ALL_THREADS   ) return "BLOCK";
461    else if( action_type == UNBLOCK_ALL_THREADS ) return "UNBLOCK";
462    else if( action_type == DELETE_ALL_THREADS  ) return "DELETE";
463    else                                          return "undefined";
464}
465
466////////////////////////////////////////
467void process_sigaction( pid_t       pid,
468                        uint32_t    type )
469{
470    cxy_t              owner_cxy;         // owner cluster identifier
471    lpid_t             lpid;              // process index in owner cluster
472    cluster_t        * cluster;           // pointer on cluster manager
473    xptr_t             root_xp;           // extended pointer on root of copies
474    xptr_t             lock_xp;           // extended pointer on lock protecting copies
475    xptr_t             iter_xp;           // iterator on copies list
476    xptr_t             process_xp;        // extended pointer on process copy
477    cxy_t              process_cxy;       // process copy cluster identifier
478    process_t        * process_ptr;       // local pointer on process copy
479    reg_t              save_sr;           // for critical section
480    rpc_desc_t         rpc;               // shared RPC descriptor
481    thread_t         * client;            // pointer on client thread
482    xptr_t             client_xp;         // extended pointer on client thread
483    process_t        * local;             // pointer on process copy in local cluster
484    uint32_t           remote_nr;         // number of remote process copies
485
486    client    = CURRENT_THREAD;
487    client_xp = XPTR( local_cxy , client );
488    local     = NULL;
489    remote_nr = 0;
490
491#if DEBUG_PROCESS_SIGACTION
492uint32_t cycle = (uint32_t)hal_get_cycles();
493if( DEBUG_PROCESS_SIGACTION < cycle )
494printk("\n[DBG] %s : thread %x in process %x enter to %s process %x / cycle %d\n",
495__FUNCTION__ , client->trdid, client->process->pid,
496process_action_str( type ) , pid , cycle );
497#endif
498
499    // get pointer on local cluster manager
500    cluster = LOCAL_CLUSTER;
501
502    // get owner cluster identifier and process lpid
503    owner_cxy = CXY_FROM_PID( pid );
504    lpid      = LPID_FROM_PID( pid );
505
506    // get root of list of copies, lock, and number of copies from owner cluster
507    root_xp   = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
508    lock_xp   = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
509
510    // check action type
511    assert( ((type == DELETE_ALL_THREADS ) ||
512             (type == BLOCK_ALL_THREADS )  ||
513             (type == UNBLOCK_ALL_THREADS )), __FUNCTION__ , "illegal action type" );
514             
515
516    // The client thread send parallel RPCs to all remote clusters containing
517    // target process copies, wait all responses, and then handles directly the
518    // threads in local cluster, when required.
519    // The client thread allocates a - shared - RPC descriptor in the stack,
520    // because all parallel, non-blocking, server threads use the same input
521    // arguments, and use the shared RPC response field
522
523    // mask IRQs
524    hal_disable_irq( &save_sr);
525
526    // client thread blocks itself
527    thread_block( client_xp , THREAD_BLOCKED_RPC );
528
529    // take the lock protecting the copies
530    remote_spinlock_lock( lock_xp );
531
532    // initialize shared RPC descriptor
533    rpc.responses = 0;
534    rpc.blocking  = false;
535    rpc.index     = RPC_PROCESS_SIGACTION;
536    rpc.thread    = client;
537    rpc.lid       = client->core->lid;
538    rpc.args[0]   = type;
539    rpc.args[1]   = pid;
540
541    // scan list of process copies
542    // to send RPCs to remote copies
543    XLIST_FOREACH( root_xp , iter_xp )
544    {
545        // get extended pointers and cluster on process
546        process_xp  = XLIST_ELEMENT( iter_xp , process_t , copies_list );
547        process_cxy = GET_CXY( process_xp );
548        process_ptr = GET_PTR( process_xp );
549
550        if( process_cxy == local_cxy )    // process is local
551        { 
552            local = process_ptr;
553        }
554        else                              // process is remote
555        {
556            // update number of remote process copies
557            remote_nr++;
558
559            // atomically increment responses counter
560            hal_atomic_add( (void *)&rpc.responses , 1 );
561
562#if DEBUG_PROCESS_SIGACTION
563if( DEBUG_PROCESS_SIGACTION < cycle )
564printk("\n[DBG] %s : thread %x in process %x handles remote process %x in cluster %x\n",
565__FUNCTION__, client->trdid, client->process->pid, pid , process_cxy );
566#endif
567            // call RPC in target cluster
568            rpc_process_sigaction_client( process_cxy , &rpc );
569        }
570    }  // end list of copies
571
572    // release the lock protecting process copies
573    remote_spinlock_unlock( lock_xp );
574
575    // restore IRQs
576    hal_restore_irq( save_sr);
577
578    // - if there is remote process copies, the client thread deschedules,
579    //   (it will be unblocked by the last RPC server thread).
580    // - if there is no remote copies, the client thread unblock itself.
581    if( remote_nr )
582    {
583        sched_yield("blocked on rpc_process_sigaction");
584    } 
585    else
586    {
587        thread_unblock( client_xp , THREAD_BLOCKED_RPC );
588    }
589
590    // handle the local process copy if required
591    if( local != NULL )
592    {
593
594#if DEBUG_PROCESS_SIGACTION
595if( DEBUG_PROCESS_SIGACTION < cycle )
596printk("\n[DBG] %s : thread %x in process %x handles local process %x in cluster %x\n",
597__FUNCTION__, client->trdid, client->process->pid, pid , local_cxy );
598#endif
599        if     (type == DELETE_ALL_THREADS  ) process_delete_threads ( local , client_xp ); 
600        else if(type == BLOCK_ALL_THREADS   ) process_block_threads  ( local , client_xp ); 
601        else if(type == UNBLOCK_ALL_THREADS ) process_unblock_threads( local );
602    }
603
604#if DEBUG_PROCESS_SIGACTION
605cycle = (uint32_t)hal_get_cycles();
606if( DEBUG_PROCESS_SIGACTION < cycle )
607printk("\n[DBG] %s : thread %x in process %x exit after %s process %x / cycle %d\n",
608__FUNCTION__, client->trdid, client->process->pid,
609process_action_str( type ), pid, cycle );
610#endif
611
612}  // end process_sigaction()
613
614/////////////////////////////////////////////////
615void process_block_threads( process_t * process,
616                            xptr_t      client_xp )
617{
618    thread_t          * target;         // pointer on target thread
619    thread_t          * this;           // pointer on calling thread
620    uint32_t            ltid;           // index in process th_tbl
621    cxy_t               owner_cxy;      // target process owner cluster
622    uint32_t            count;          // requests counter
623    volatile uint32_t   ack_count;      // scheduler acknowledge counter
624
625    // get calling thread pointer
626    this = CURRENT_THREAD;
627
628    // get target process owner cluster
629    owner_cxy = CXY_FROM_PID( process->pid );
630
631#if DEBUG_PROCESS_SIGACTION
632uint32_t cycle = (uint32_t)hal_get_cycles();
633if( DEBUG_PROCESS_SIGACTION < cycle )
634printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
635__FUNCTION__ , this , process->pid , local_cxy , cycle );
636#endif
637
638    // get lock protecting process th_tbl[]
639    spinlock_lock( &process->th_lock );
640
641    // loop on target process local threads
642    // we use both "ltid" and "count" because it can exist "holes" in th_tbl
643    for( ltid = 0 , count = 0 , ack_count = 0 ; count < process->th_nr ; ltid++ )
644    {
645        target = process->th_tbl[ltid];
646
647        if( target != NULL )                                 // thread exist
648        {
649            count++;
650
651            // main thread and client thread should not be blocked
652            if( ((ltid != 0) || (owner_cxy != local_cxy)) &&         // not main thread
653                (client_xp) != XPTR( local_cxy , target ) )          // not client thread
654            {
655                // set the global blocked bit in target thread descriptor.
656                thread_block( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
657 
658                // - if the calling thread and the target thread are on the same core,
659                //   we don't need confirmation from scheduler,
660                // - if the calling thread and the target thread are not running on the same
661                //   core, we ask the target scheduler to acknowlege the blocking
662                //   to be sure that the target thread is not running.
663           
664                if( this->core->lid != target->core->lid )
665                {
666                    // increment responses counter
667                    hal_atomic_add( (void*)&ack_count , 1 );
668
669                    // set FLAG_REQ_ACK and &ack_rsp_count in target descriptor
670                    thread_set_req_ack( target , (uint32_t *)&ack_count );
671
672                    // force scheduling on target thread
673                    dev_pic_send_ipi( local_cxy , target->core->lid );
674                }
675            }
676        }
677    }
678
679    // release lock protecting process th_tbl[]
680    spinlock_unlock( &process->th_lock );
681
682    // wait acknowledges
683    while( 1 )
684    {
685        // exit when all scheduler acknoledges received
686        if ( ack_count == 0 ) break;
687   
688        // wait 1000 cycles before retry
689        hal_fixed_delay( 1000 );
690    }
691
692#if DEBUG_PROCESS_SIGACTION
693cycle = (uint32_t)hal_get_cycles();
694if( DEBUG_PROCESS_SIGACTION < cycle )
695printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
696__FUNCTION__ , this , process->pid , local_cxy , cycle );
697#endif
698
699}  // end process_block_threads()
700
701/////////////////////////////////////////////////
702void process_delete_threads( process_t * process,
703                             xptr_t      client_xp )
704{
705    thread_t          * this;          // pointer on calling thread
706    thread_t          * target;        // local pointer on target thread
707    xptr_t              target_xp;     // extended pointer on target thread
708    cxy_t               owner_cxy;     // owner process cluster
709    uint32_t            ltid;          // index in process th_tbl
710    uint32_t            count;         // threads counter
711
712    // get calling thread pointer
713    this = CURRENT_THREAD;
714
715    // get target process owner cluster
716    owner_cxy = CXY_FROM_PID( process->pid );
717
718#if DEBUG_PROCESS_SIGACTION
719uint32_t cycle = (uint32_t)hal_get_cycles();
720if( DEBUG_PROCESS_SIGACTION < cycle )
721printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
722__FUNCTION__ , this , process->pid , local_cxy , cycle );
723#endif
724
725    // get lock protecting process th_tbl[]
726    spinlock_lock( &process->th_lock );
727
728    // loop on target process local threads                       
729    // we use both "ltid" and "count" because it can exist "holes" in th_tbl
730    for( ltid = 0 , count = 0  ; count < process->th_nr ; ltid++ )
731    {
732        target = process->th_tbl[ltid];
733
734        if( target != NULL )    // valid thread 
735        {
736            count++;
737            target_xp = XPTR( local_cxy , target );
738
739            // main thread and client thread should not be blocked
740            if( ((ltid != 0) || (owner_cxy != local_cxy)) &&         // not main thread
741                (client_xp) != target_xp )                           // not client thread
742            {
743                // mark target thread for delete and block it
744                thread_delete( target_xp , process->pid , false );   // not forced
745            }
746        }
747    }
748
749    // release lock protecting process th_tbl[]
750    spinlock_unlock( &process->th_lock );
751
752#if DEBUG_PROCESS_SIGACTION
753cycle = (uint32_t)hal_get_cycles();
754if( DEBUG_PROCESS_SIGACTION < cycle )
755printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
756__FUNCTION__ , this , process->pid , local_cxy , cycle );
757#endif
758
759}  // end process_delete_threads()
760
761///////////////////////////////////////////////////
762void process_unblock_threads( process_t * process )
763{
764    thread_t          * target;        // pointer on target thead
765    thread_t          * this;          // pointer on calling thread
766    uint32_t            ltid;          // index in process th_tbl
767    uint32_t            count;         // requests counter
768
769    // get calling thread pointer
770    this = CURRENT_THREAD;
771
772#if DEBUG_PROCESS_SIGACTION
773uint32_t cycle = (uint32_t)hal_get_cycles();
774if( DEBUG_PROCESS_SIGACTION < cycle )
775printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
776__FUNCTION__ , this , process->pid , local_cxy , cycle );
777#endif
778
779    // get lock protecting process th_tbl[]
780    spinlock_lock( &process->th_lock );
781
782    // loop on process threads to unblock all threads
783    // we use both "ltid" and "count" because it can exist "holes" in th_tbl
784    for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
785    {
786        target = process->th_tbl[ltid];
787
788        if( target != NULL )             // thread found
789        {
790            count++;
791
792            // reset the global blocked bit in target thread descriptor.
793            thread_unblock( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
794        }
795    }
796
797    // release lock protecting process th_tbl[]
798    spinlock_unlock( &process->th_lock );
799
800#if DEBUG_PROCESS_SIGACTION
801cycle = (uint32_t)hal_get_cycles();
802if( DEBUG_PROCESS_SIGACTION < cycle )
803printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
804__FUNCTION__ , this , process->pid , local_cxy , cycle );
805#endif
806
807}  // end process_unblock_threads()
808
809///////////////////////////////////////////////
810process_t * process_get_local_copy( pid_t pid )
811{
812    error_t        error;
813    process_t    * process_ptr;   // local pointer on process
814    xptr_t         process_xp;    // extended pointer on process
815
816    cluster_t * cluster = LOCAL_CLUSTER;
817
818    // get lock protecting local list of processes
819    remote_spinlock_lock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
820
821    // scan the local list of process descriptors to find the process
822    xptr_t  iter;
823    bool_t  found = false;
824    XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter )
825    {
826        process_xp  = XLIST_ELEMENT( iter , process_t , local_list );
827        process_ptr = GET_PTR( process_xp );
828        if( process_ptr->pid == pid )
829        {
830            found = true;
831            break;
832        }
833    }
834
835    // release lock protecting local list of processes
836    remote_spinlock_unlock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
837
838    // allocate memory for a new local process descriptor
839    // and initialise it from reference cluster if not found
840    if( !found )
841    {
842        // get extended pointer on reference process descriptor
843        xptr_t ref_xp = cluster_get_reference_process_from_pid( pid );
844
845        assert( (ref_xp != XPTR_NULL) , __FUNCTION__ , "illegal pid\n" );
846
847        // allocate memory for local process descriptor
848        process_ptr = process_alloc();
849
850        if( process_ptr == NULL )  return NULL;
851
852        // initialize local process descriptor copy
853        error = process_copy_init( process_ptr , ref_xp );
854
855        if( error ) return NULL;
856    }
857
858#if DEBUG_PROCESS_GET_LOCAL_COPY
859uint32_t cycle = (uint32_t)hal_get_cycles();
860if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
861printk("\n[DBG] %s : enter in cluster %x / pid %x / process %x / cycle %d\n",
862__FUNCTION__ , local_cxy , pid , process_ptr , cycle );
863#endif
864
865    return process_ptr;
866
867}  // end process_get_local_copy()
868
869////////////////////////////////////////////
870pid_t process_get_ppid( xptr_t  process_xp )
871{
872    cxy_t       process_cxy;
873    process_t * process_ptr;
874    xptr_t      parent_xp;
875    cxy_t       parent_cxy;
876    process_t * parent_ptr;
877
878    // get process cluster and local pointer
879    process_cxy = GET_CXY( process_xp );
880    process_ptr = GET_PTR( process_xp );
881
882    // get pointers on parent process
883    parent_xp  = (xptr_t)hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
884    parent_cxy = GET_CXY( parent_xp );
885    parent_ptr = GET_PTR( parent_xp );
886
887    return hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
888}
889
890//////////////////////////////////////////////////////////////////////////////////////////
891// File descriptor array related functions
892//////////////////////////////////////////////////////////////////////////////////////////
893
894///////////////////////////////////////////
895void process_fd_init( process_t * process )
896{
897    uint32_t fd;
898
899    remote_spinlock_init( XPTR( local_cxy , &process->fd_array.lock ) );
900
901    process->fd_array.current = 0;
902
903    // initialize array
904    for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
905    {
906        process->fd_array.array[fd] = XPTR_NULL;
907    }
908}
909
910//////////////////////////////
911bool_t process_fd_array_full()
912{
913    // get extended pointer on reference process
914    xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
915
916    // get reference process cluster and local pointer
917    process_t * ref_ptr = GET_PTR( ref_xp );
918    cxy_t       ref_cxy = GET_CXY( ref_xp );
919
920    // get number of open file descriptors from reference fd_array
921    uint32_t current = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->fd_array.current ) );
922
923        return ( current >= CONFIG_PROCESS_FILE_MAX_NR );
924}
925
926/////////////////////////////////////////////////
927error_t process_fd_register( process_t * process,
928                             xptr_t      file_xp,
929                             uint32_t  * fdid )
930{
931    bool_t    found;
932    uint32_t  id;
933    xptr_t    xp;
934
935    // get reference process cluster and local pointer
936    xptr_t ref_xp = process->ref_xp;
937    process_t * ref_ptr = GET_PTR( ref_xp );
938    cxy_t       ref_cxy = GET_CXY( ref_xp );
939
940    // take lock protecting reference fd_array
941        remote_spinlock_lock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
942
943    found   = false;
944
945    for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ )
946    {
947        xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) );
948        if ( xp == XPTR_NULL )
949        {
950            found = true;
951            hal_remote_swd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) , file_xp );
952                hal_remote_atomic_add( XPTR( ref_cxy , &ref_ptr->fd_array.current ) , 1 );
953                        *fdid = id;
954            break;
955        }
956    }
957
958    // release lock protecting reference fd_array
959        remote_spinlock_unlock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
960
961    if ( !found ) return -1;
962    else          return 0;
963}
964
965////////////////////////////////////////////////
966xptr_t process_fd_get_xptr( process_t * process,
967                            uint32_t    fdid )
968{
969    xptr_t  file_xp;
970
971    // access local copy of process descriptor
972    file_xp = process->fd_array.array[fdid];
973
974    if( file_xp == XPTR_NULL )
975    {
976        // get reference process cluster and local pointer
977        xptr_t      ref_xp  = process->ref_xp;
978        cxy_t       ref_cxy = GET_CXY( ref_xp );
979        process_t * ref_ptr = GET_PTR( ref_xp );
980
981        // access reference process descriptor
982        file_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[fdid] ) );
983
984        // update local fd_array if found
985        if( file_xp != XPTR_NULL )
986        {
987            process->fd_array.array[fdid] = file_xp;
988        }
989    }
990
991    return file_xp;
992
993}  // end process_fd_get_xptr()
994
995///////////////////////////////////////////
996void process_fd_remote_copy( xptr_t dst_xp,
997                             xptr_t src_xp )
998{
999    uint32_t fd;
1000    xptr_t   entry;
1001
1002    // get cluster and local pointer for src fd_array
1003    cxy_t        src_cxy = GET_CXY( src_xp );
1004    fd_array_t * src_ptr = GET_PTR( src_xp );
1005
1006    // get cluster and local pointer for dst fd_array
1007    cxy_t        dst_cxy = GET_CXY( dst_xp );
1008    fd_array_t * dst_ptr = GET_PTR( dst_xp );
1009
1010    // get the remote lock protecting the src fd_array
1011        remote_spinlock_lock( XPTR( src_cxy , &src_ptr->lock ) );
1012
1013    // loop on all fd_array entries
1014    for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
1015        {
1016                entry = (xptr_t)hal_remote_lwd( XPTR( src_cxy , &src_ptr->array[fd] ) );
1017
1018                if( entry != XPTR_NULL )
1019                {
1020            // increment file descriptor refcount
1021            vfs_file_count_up( entry );
1022
1023                        // copy entry in destination process fd_array
1024                        hal_remote_swd( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry );
1025                }
1026        }
1027
1028    // release lock on source process fd_array
1029        remote_spinlock_unlock( XPTR( src_cxy , &src_ptr->lock ) );
1030
1031}  // end process_fd_remote_copy()
1032
1033////////////////////////////////////////////////////////////////////////////////////
1034//  Thread related functions
1035////////////////////////////////////////////////////////////////////////////////////
1036
1037/////////////////////////////////////////////////////
1038error_t process_register_thread( process_t * process,
1039                                 thread_t  * thread,
1040                                 trdid_t   * trdid )
1041{
1042    ltid_t   ltid;
1043    bool_t   found = false;
1044
1045    assert( (process != NULL) , __FUNCTION__ , "process argument is NULL" );
1046
1047    assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" );
1048
1049    // take lock protecting th_tbl
1050    spinlock_lock( &process->th_lock );
1051
1052    // search a free slot in th_tbl[]
1053    for( ltid = 0 ; ltid < CONFIG_THREAD_MAX_PER_CLUSTER ; ltid++ )
1054    {
1055        if( process->th_tbl[ltid] == NULL )
1056        {
1057            found = true;
1058            break;
1059        }
1060    }
1061
1062    if( found )
1063    {
1064        // register thread in th_tbl[]
1065        process->th_tbl[ltid] = thread;
1066        process->th_nr++;
1067
1068        // returns trdid
1069        *trdid = TRDID( local_cxy , ltid );
1070    }
1071
1072    // release lock protecting th_tbl
1073    hal_fence();
1074    spinlock_unlock( &process->th_lock );
1075
1076    return (found) ? 0 : ENOMEM;
1077
1078}  // end process_register_thread()
1079
1080/////////////////////////////////////////////////
1081bool_t process_remove_thread( thread_t * thread )
1082{
1083    uint32_t count;  // number of threads in local process descriptor
1084
1085    assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" );
1086
1087    process_t * process = thread->process;
1088
1089    // get thread local index
1090    ltid_t  ltid = LTID_FROM_TRDID( thread->trdid );
1091
1092    // take lock protecting th_tbl
1093    spinlock_lock( &process->th_lock );
1094
1095    count = process->th_nr;
1096
1097    assert( (count > 0) , __FUNCTION__ , "process th_nr cannot be 0\n" );
1098
1099    // remove thread from th_tbl[]
1100    process->th_tbl[ltid] = NULL;
1101    process->th_nr = count-1;
1102
1103    // release lock protecting th_tbl
1104    hal_fence();
1105    spinlock_unlock( &process->th_lock );
1106
1107    return (count == 1);
1108
1109}  // end process_remove_thread()
1110
1111/////////////////////////////////////////////////////////
1112error_t process_make_fork( xptr_t      parent_process_xp,
1113                           xptr_t      parent_thread_xp,
1114                           pid_t     * child_pid,
1115                           thread_t ** child_thread )
1116{
1117    process_t * process;         // local pointer on child process descriptor
1118    thread_t  * thread;          // local pointer on child thread descriptor
1119    pid_t       new_pid;         // process identifier for child process
1120    pid_t       parent_pid;      // process identifier for parent process
1121    xptr_t      ref_xp;          // extended pointer on reference process
1122    xptr_t      vfs_bin_xp;      // extended pointer on .elf file
1123    error_t     error;
1124
1125    // get cluster and local pointer for parent process
1126    cxy_t       parent_process_cxy = GET_CXY( parent_process_xp );
1127    process_t * parent_process_ptr = GET_PTR( parent_process_xp );
1128
1129    // get parent process PID and extended pointer on .elf file
1130    parent_pid = hal_remote_lw (XPTR( parent_process_cxy , &parent_process_ptr->pid));
1131    vfs_bin_xp = hal_remote_lwd(XPTR( parent_process_cxy , &parent_process_ptr->vfs_bin_xp));
1132
1133    // check parent process is the reference process
1134    ref_xp = hal_remote_lwd( XPTR( parent_process_cxy , &parent_process_ptr->ref_xp ) );
1135
1136    assert( (parent_process_xp == ref_xp ) , __FUNCTION__ ,
1137    "parent process must be the reference process\n" );
1138
1139#if DEBUG_PROCESS_MAKE_FORK
1140uint32_t cycle = (uint32_t)hal_get_cycles();
1141if( DEBUG_PROCESS_MAKE_FORK < cycle )
1142printk("\n[DBG] %s : thread %x in process %x enter / cluster %x / cycle %d\n",
1143__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, local_cxy, cycle );
1144#endif
1145
1146    // allocate a process descriptor
1147    process = process_alloc();
1148    if( process == NULL )
1149    {
1150        printk("\n[ERROR] in %s : cannot get process in cluster %x\n", 
1151        __FUNCTION__, local_cxy ); 
1152        return -1;
1153    }
1154
1155    // allocate a child PID from local cluster
1156    error = cluster_pid_alloc( process , &new_pid );
1157    if( error ) 
1158    {
1159        printk("\n[ERROR] in %s : cannot get PID in cluster %x\n", 
1160        __FUNCTION__, local_cxy ); 
1161        process_free( process );
1162        return -1;
1163    }
1164
1165#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1166cycle = (uint32_t)hal_get_cycles();
1167if( DEBUG_PROCESS_MAKE_FORK < cycle )
1168printk("\n[DBG] %s : thread %x in process %x allocated process %x / cycle %d\n",
1169__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1170#endif
1171
1172    // initializes child process descriptor from parent process descriptor
1173    process_reference_init( process,
1174                            new_pid,
1175                            parent_process_xp );
1176
1177#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1178cycle = (uint32_t)hal_get_cycles();
1179if( DEBUG_PROCESS_MAKE_FORK < cycle )
1180printk("\n[DBG] %s : thread %x in process %x initialized child_process %x / cycle %d\n",
1181__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1182#endif
1183
1184    // give TXT ownership to child process
1185    process_txt_set_ownership( XPTR( local_cxy , process ) );
1186
1187    // copy VMM from parent descriptor to child descriptor
1188    error = vmm_fork_copy( process,
1189                           parent_process_xp );
1190    if( error )
1191    {
1192        printk("\n[ERROR] in %s : cannot copy VMM in cluster %x\n", 
1193        __FUNCTION__, local_cxy ); 
1194        process_free( process );
1195        cluster_pid_release( new_pid );
1196        return -1;
1197    }
1198
1199#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1200cycle = (uint32_t)hal_get_cycles();
1201if( DEBUG_PROCESS_MAKE_FORK < cycle )
1202printk("\n[DBG] %s : thread %x in process %x copied VMM from parent %x to child %x / cycle %d\n",
1203__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, 
1204parent_pid, new_pid, cycle );
1205#endif
1206
1207    // parent process gives TXT ownership to child process if required
1208    if( process_txt_is_owner(parent_process_xp) ) 
1209    {
1210        process_txt_set_ownership( XPTR( local_cxy , process ) );
1211
1212#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1213cycle = (uint32_t)hal_get_cycles();
1214if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1215printk("\n[DBG] %s : thread %x in process %x gives TXT from parent %x to child %x / cycle %d\n",
1216__FUNCTION__ , CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1217parent_pid, new_pid, cycle );
1218#endif
1219
1220    }
1221
1222    // update extended pointer on .elf file
1223    process->vfs_bin_xp = vfs_bin_xp;
1224
1225    // create child thread descriptor from parent thread descriptor
1226    error = thread_user_fork( parent_thread_xp,
1227                              process,
1228                              &thread );
1229    if( error )
1230    {
1231        printk("\n[ERROR] in %s : cannot create thread in cluster %x\n",
1232        __FUNCTION__, local_cxy ); 
1233        process_free( process );
1234        cluster_pid_release( new_pid );
1235        return -1;
1236    }
1237
1238    // check main thread LTID
1239    assert( (LTID_FROM_TRDID(thread->trdid) == 0) , __FUNCTION__ ,
1240    "main thread must have LTID == 0\n" );
1241
1242//#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1243#if DEBUG_PROCESS_MAKE_FORK
1244cycle = (uint32_t)hal_get_cycles();
1245if( DEBUG_PROCESS_MAKE_FORK < cycle )
1246printk("\n[DBG] %s : thread %x in process %x created main thread %x / cycle %d\n", 
1247__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, thread, cycle );
1248#endif
1249
1250    // set Copy_On_Write flag in parent process GPT
1251    // this includes all replicated GPT copies
1252    if( parent_process_cxy == local_cxy )   // reference is local
1253    {
1254        vmm_set_cow( parent_process_ptr );
1255    }
1256    else                                    // reference is remote
1257    {
1258        rpc_vmm_set_cow_client( parent_process_cxy,
1259                                parent_process_ptr );
1260    }
1261
1262    // set Copy_On_Write flag in child process GPT
1263    vmm_set_cow( process );
1264 
1265#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1266cycle = (uint32_t)hal_get_cycles();
1267if( DEBUG_PROCESS_MAKE_FORK < cycle )
1268printk("\n[DBG] %s : thread %x in process %x set COW in parent and child / cycle %d\n",
1269__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1270#endif
1271
1272    // get extended pointers on parent children_root, children_lock and children_nr
1273    xptr_t children_root_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_root );
1274    xptr_t children_lock_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_lock );
1275    xptr_t children_nr_xp   = XPTR( parent_process_cxy , &parent_process_ptr->children_nr   );
1276
1277    // register process in parent children list
1278    remote_spinlock_lock( children_lock_xp );
1279        xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1280        hal_remote_atomic_add( children_nr_xp , 1 );
1281    remote_spinlock_unlock( children_lock_xp );
1282
1283    // return success
1284    *child_thread = thread;
1285    *child_pid    = new_pid;
1286
1287#if DEBUG_PROCESS_MAKE_FORK
1288cycle = (uint32_t)hal_get_cycles();
1289if( DEBUG_PROCESS_MAKE_FORK < cycle )
1290printk("\n[DBG] %s : thread %x in process %x exit / created process %x / cycle %d\n",
1291__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1292#endif
1293
1294    return 0;
1295
1296}   // end process_make_fork()
1297
1298/////////////////////////////////////////////////////
1299error_t process_make_exec( exec_info_t  * exec_info )
1300{
1301    thread_t       * thread;                  // local pointer on this thread
1302    process_t      * process;                 // local pointer on this process
1303    pid_t            pid;                     // this process identifier
1304        error_t          error;                   // value returned by called functions
1305    char           * path;                    // path to .elf file
1306    xptr_t           file_xp;                 // extended pointer on .elf file descriptor
1307    uint32_t         file_id;                 // file index in fd_array
1308    uint32_t         args_nr;                 // number of main thread arguments
1309    char          ** args_pointers;           // array of pointers on main thread arguments
1310
1311    // get thread, process & PID
1312    thread  = CURRENT_THREAD;
1313    process = thread->process;
1314    pid     = process->pid;
1315
1316        // get relevant infos from exec_info
1317        path          = exec_info->path;
1318    args_nr       = exec_info->args_nr;
1319    args_pointers = exec_info->args_pointers;
1320
1321#if DEBUG_PROCESS_MAKE_EXEC
1322uint32_t cycle = (uint32_t)hal_get_cycles();
1323if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1324printk("\n[DBG] %s : thread %x in process %x enters / path %s / cycle %d\n",
1325__FUNCTION__, thread->trdid, pid, path, cycle );
1326#endif
1327
1328    // open the file identified by <path>
1329    file_xp = XPTR_NULL;
1330    file_id = -1;
1331        error   = vfs_open( process,
1332                            path,
1333                            O_RDONLY,
1334                            0,
1335                            &file_xp,
1336                            &file_id );
1337        if( error )
1338        {
1339                printk("\n[ERROR] in %s : failed to open file <%s>\n", __FUNCTION__ , path );
1340                return -1;
1341        }
1342
1343#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1344cycle = (uint32_t)hal_get_cycles();
1345if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1346printk("\n[DBG] %s : thread %x in process %x opened file <%s> / cycle %d\n",
1347__FUNCTION__, thread->trdid, pid, path, cycle );
1348#endif
1349
1350    // delete all threads other than this main thread in all clusters
1351    process_sigaction( pid , DELETE_ALL_THREADS );
1352
1353#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1354cycle = (uint32_t)hal_get_cycles();
1355if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1356printk("\n[DBG] %s : thread %x in process %x deleted all threads / cycle %d\n",
1357__FUNCTION__, thread->trdid, pid, cycle );
1358#endif
1359
1360    // reset local process VMM
1361    vmm_destroy( process );
1362
1363#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1364cycle = (uint32_t)hal_get_cycles();
1365if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1366printk("\n[DBG] %s : thread %x in process %x reset VMM / cycle %d\n",
1367__FUNCTION__, thread->trdid, pid, cycle );
1368#endif
1369
1370    // re-initialize the VMM (kentry/args/envs vsegs registration)
1371    error = vmm_init( process );
1372    if( error )
1373    {
1374        printk("\n[ERROR] in %s : cannot initialise VMM for %s\n", __FUNCTION__ , path );
1375        vfs_close( file_xp , file_id );
1376        // FIXME restore old process VMM
1377        return -1;
1378    }
1379   
1380#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1381cycle = (uint32_t)hal_get_cycles();
1382if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1383printk("\n[DBG] %s : thread %x in process %x / kentry/args/envs vsegs registered / cycle %d\n",
1384__FUNCTION__, thread->trdid, pid, cycle );
1385#endif
1386
1387    // register code & data vsegs as well as entry-point in process VMM,
1388    // and register extended pointer on .elf file in process descriptor
1389        error = elf_load_process( file_xp , process );
1390    if( error )
1391        {
1392                printk("\n[ERROR] in %s : failed to access <%s>\n", __FUNCTION__ , path );
1393        vfs_close( file_xp , file_id );
1394        // FIXME restore old process VMM
1395        return -1;
1396        }
1397
1398#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1399cycle = (uint32_t)hal_get_cycles();
1400if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1401printk("\n[DBG] %s : thread %x in process %x / code/data vsegs registered / cycle %d\n",
1402__FUNCTION__, thread->trdid, pid, cycle );
1403#endif
1404
1405    // update the existing main thread descriptor... and jump to user code
1406    error = thread_user_exec( (void *)process->vmm.entry_point,
1407                              args_nr,
1408                              args_pointers );
1409    if( error )
1410    {
1411        printk("\n[ERROR] in %s : cannot update main thread for %s\n", __FUNCTION__ , path );
1412        vfs_close( file_xp , file_id );
1413        // FIXME restore old process VMM
1414        return -1;
1415    }
1416
1417    assert( false, __FUNCTION__, "we should not execute this code");
1418 
1419        return 0;
1420
1421}  // end process_make_exec()
1422
1423
1424///////////////////////////////////////////////
1425void process_zero_create( process_t * process )
1426{
1427
1428#if DEBUG_PROCESS_ZERO_CREATE
1429uint32_t cycle = (uint32_t)hal_get_cycles();
1430if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1431printk("\n[DBG] %s : thread %x enter / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1432#endif
1433
1434    // initialize PID, REF_XP, PARENT_XP, and STATE
1435    process->pid        = 0;
1436    process->ref_xp     = XPTR( local_cxy , process );
1437    process->owner_xp   = XPTR( local_cxy , process );
1438    process->parent_xp  = XPTR_NULL;
1439    process->term_state = 0;
1440
1441    // reset th_tbl[] array as empty
1442    uint32_t i;
1443    for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
1444        {
1445        process->th_tbl[i] = NULL;
1446    }
1447    process->th_nr  = 0;
1448    spinlock_init( &process->th_lock );
1449
1450    // reset children list as empty
1451    xlist_root_init( XPTR( local_cxy , &process->children_root ) );
1452    remote_spinlock_init( XPTR( local_cxy , &process->children_lock ) );
1453    process->children_nr = 0;
1454
1455        hal_fence();
1456
1457#if DEBUG_PROCESS_ZERO_CREATE
1458cycle = (uint32_t)hal_get_cycles();
1459if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1460printk("\n[DBG] %s : thread %x exit / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1461#endif
1462
1463}  // end process_zero_init()
1464
1465//////////////////////////
1466void process_init_create()
1467{
1468    process_t      * process;       // local pointer on process descriptor
1469    pid_t            pid;           // process_init identifier
1470    thread_t       * thread;        // local pointer on main thread
1471    pthread_attr_t   attr;          // main thread attributes
1472    lid_t            lid;           // selected core local index for main thread
1473    xptr_t           file_xp;       // extended pointer on .elf file descriptor
1474    uint32_t         file_id;       // file index in fd_array
1475    error_t          error;
1476
1477#if DEBUG_PROCESS_INIT_CREATE
1478uint32_t cycle = (uint32_t)hal_get_cycles();
1479if( DEBUG_PROCESS_INIT_CREATE < cycle )
1480printk("\n[DBG] %s : thread %x in process %x enter / cycle %d\n",
1481__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1482#endif
1483
1484    // allocates memory for process descriptor from local cluster
1485        process = process_alloc(); 
1486       
1487    assert( (process != NULL), __FUNCTION__,
1488    "no memory for process descriptor in cluster %x\n", local_cxy  );
1489
1490    // get PID from local cluster
1491    error = cluster_pid_alloc( process , &pid );
1492
1493    assert( (error == 0), __FUNCTION__,
1494    "cannot allocate PID in cluster %x\n", local_cxy );
1495
1496    assert( (pid == 1) , __FUNCTION__,
1497    "process INIT must be first process in cluster 0\n" );
1498
1499    // initialize process descriptor / parent is local process_zero
1500    process_reference_init( process,
1501                            pid,
1502                            XPTR( local_cxy , &process_zero ) ); 
1503
1504    // open the file identified by CONFIG_PROCESS_INIT_PATH
1505    file_xp = XPTR_NULL;
1506    file_id = -1;
1507        error   = vfs_open( process,
1508                            CONFIG_PROCESS_INIT_PATH,
1509                            O_RDONLY,
1510                            0,
1511                            &file_xp,
1512                            &file_id );
1513
1514        assert( (error == 0), __FUNCTION__,
1515    "failed to open file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1516
1517    // register "code" and "data" vsegs as well as entry-point
1518    // in process VMM, using information contained in the elf file.
1519        error = elf_load_process( file_xp , process );
1520
1521        assert( (error == 0), __FUNCTION__,
1522    "cannot access .elf file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1523
1524    // get extended pointers on process_zero children_root, children_lock
1525    xptr_t children_root_xp = XPTR( local_cxy , &process_zero.children_root );
1526    xptr_t children_lock_xp = XPTR( local_cxy , &process_zero.children_lock );
1527
1528    // register process INIT in parent local process_zero
1529    remote_spinlock_lock( children_lock_xp );
1530        xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1531        hal_atomic_add( &process_zero.children_nr , 1 );
1532    remote_spinlock_unlock( children_lock_xp );
1533
1534    // select a core in local cluster to execute the main thread
1535    lid  = cluster_select_local_core();
1536
1537    // initialize pthread attributes for main thread
1538    attr.attributes = PT_ATTR_DETACH | PT_ATTR_CLUSTER_DEFINED | PT_ATTR_CORE_DEFINED;
1539    attr.cxy        = local_cxy;
1540    attr.lid        = lid;
1541
1542    // create and initialize thread descriptor
1543        error = thread_user_create( pid,
1544                                (void *)process->vmm.entry_point,
1545                                NULL,
1546                                &attr,
1547                                &thread );
1548
1549        assert( (error == 0), __FUNCTION__,
1550    "cannot create main thread for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1551
1552    assert( (thread->trdid == 0), __FUNCTION__,
1553    "main thread must have index 0 for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1554
1555    // activate thread
1556        thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL );
1557
1558    hal_fence();
1559
1560#if DEBUG_PROCESS_INIT_CREATE
1561cycle = (uint32_t)hal_get_cycles();
1562if( DEBUG_PROCESS_INIT_CREATE < cycle )
1563printk("\n[DBG] %s : thread %x in process %x exit / cycle %d\n",
1564__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1565#endif
1566
1567}  // end process_init_create()
1568
1569/////////////////////////////////////////
1570void process_display( xptr_t process_xp )
1571{
1572    process_t   * process_ptr;
1573    cxy_t         process_cxy;
1574
1575    xptr_t        parent_xp;       // extended pointer on parent process
1576    process_t   * parent_ptr;
1577    cxy_t         parent_cxy;
1578
1579    xptr_t        owner_xp;        // extended pointer on owner process
1580    process_t   * owner_ptr;
1581    cxy_t         owner_cxy;
1582
1583    pid_t         pid;
1584    pid_t         ppid;
1585    uint32_t      state;
1586    uint32_t      th_nr;
1587
1588    xptr_t        txt_file_xp;     // extended pointer on TXT_RX file descriptor
1589    xptr_t        txt_chdev_xp;    // extended pointer on TXT_RX chdev
1590    chdev_t     * txt_chdev_ptr;
1591    cxy_t         txt_chdev_cxy;
1592    xptr_t        txt_owner_xp;    // extended pointer on TXT owner process
1593
1594    xptr_t        elf_file_xp;     // extended pointer on .elf file
1595    cxy_t         elf_file_cxy;
1596    vfs_file_t  * elf_file_ptr;
1597    vfs_inode_t * elf_inode_ptr;   // local pointer on .elf inode
1598
1599    char          txt_name[CONFIG_VFS_MAX_NAME_LENGTH];
1600    char          elf_name[CONFIG_VFS_MAX_NAME_LENGTH];
1601
1602    // get cluster and local pointer on process
1603    process_ptr = GET_PTR( process_xp );
1604    process_cxy = GET_CXY( process_xp );
1605
1606    // get PID and state
1607    pid   = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1608    state = hal_remote_lw( XPTR( process_cxy , &process_ptr->term_state ) );
1609
1610    // get PPID
1611    parent_xp  = hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
1612    parent_cxy = GET_CXY( parent_xp );
1613    parent_ptr = GET_PTR( parent_xp );
1614    ppid       = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
1615
1616    // get number of threads
1617    th_nr      = hal_remote_lw( XPTR( process_cxy , &process_ptr->th_nr ) );
1618
1619    // get pointers on owner process descriptor
1620    owner_xp  = hal_remote_lwd( XPTR( process_cxy , &process_ptr->owner_xp ) );
1621    owner_cxy = GET_CXY( owner_xp );
1622    owner_ptr = GET_PTR( owner_xp );
1623
1624    // get extended pointer on TXT_RX file descriptor attached to process
1625    txt_file_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->fd_array.array[0] ) );
1626
1627    assert( (txt_file_xp != XPTR_NULL) , __FUNCTION__ , 
1628    "process must be attached to one TXT terminal\n" ); 
1629
1630    // get TXT_RX chdev pointers
1631    txt_chdev_xp  = chdev_from_file( txt_file_xp );
1632    txt_chdev_cxy = GET_CXY( txt_chdev_xp );
1633    txt_chdev_ptr = GET_PTR( txt_chdev_xp );
1634
1635    // get TXT_RX name and ownership
1636    hal_remote_strcpy( XPTR( local_cxy , txt_name ) ,
1637                       XPTR( txt_chdev_cxy , txt_chdev_ptr->name ) );
1638   
1639    txt_owner_xp = (xptr_t)hal_remote_lwd( XPTR( txt_chdev_cxy, 
1640                                                 &txt_chdev_ptr->ext.txt.owner_xp ) );
1641   
1642    // get process .elf name
1643    elf_file_xp   = hal_remote_lwd( XPTR( process_cxy , &process_ptr->vfs_bin_xp ) );
1644    elf_file_cxy  = GET_CXY( elf_file_xp );
1645    elf_file_ptr  = (vfs_file_t *)GET_PTR( elf_file_xp );
1646    elf_inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( elf_file_cxy , &elf_file_ptr->inode ) );
1647    vfs_inode_get_name( XPTR( elf_file_cxy , elf_inode_ptr ) , elf_name );
1648
1649    // display process info
1650    if( txt_owner_xp == process_xp )
1651    {
1652        nolock_printk("PID %X | PPID %X | TS %X | %s (FG) | %X | %d | %s\n", 
1653        pid, ppid, state, txt_name, process_ptr, th_nr, elf_name );
1654    }
1655    else
1656    {
1657        nolock_printk("PID %X | PPID %X | TS %X | %s (BG) | %X | %d | %s\n", 
1658        pid, ppid, state, txt_name, process_ptr, th_nr, elf_name );
1659    }
1660}  // end process_display()
1661
1662
1663////////////////////////////////////////////////////////////////////////////////////////
1664//     Terminals related functions
1665////////////////////////////////////////////////////////////////////////////////////////
1666
1667////////////////////////////
1668uint32_t process_txt_alloc()
1669{
1670    uint32_t  index;       // TXT terminal index
1671    xptr_t    chdev_xp;    // extended pointer on TXT_RX chdev
1672    chdev_t * chdev_ptr;   // local pointer on TXT_RX chdev
1673    cxy_t     chdev_cxy;   // TXT_RX chdev cluster
1674    xptr_t    root_xp;     // extended pointer on owner field in chdev
1675
1676    // scan the user TXT_RX chdevs (TXT0 is reserved for kernel)
1677    for( index = 1 ; index < LOCAL_CLUSTER->nb_txt_channels ; index ++ )
1678    {
1679        // get pointers on TXT_RX[index]
1680        chdev_xp  = chdev_dir.txt_rx[index];
1681        chdev_cxy = GET_CXY( chdev_xp );
1682        chdev_ptr = GET_PTR( chdev_xp );
1683
1684        // get extended pointer on root of attached process
1685        root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1686
1687        // return free TXT index if found
1688        if( xlist_is_empty( root_xp ) ) return index; 
1689    }
1690
1691    assert( false , __FUNCTION__ , "no free TXT terminal found" );
1692
1693    return -1;
1694
1695} // end process_txt_alloc()
1696
1697/////////////////////////////////////////////
1698void process_txt_attach( process_t * process,
1699                         uint32_t    txt_id )
1700{
1701    xptr_t      chdev_xp;     // extended pointer on TXT_RX chdev
1702    cxy_t       chdev_cxy;    // TXT_RX chdev cluster
1703    chdev_t *   chdev_ptr;    // local pointer on TXT_RX chdev
1704    xptr_t      root_xp;      // extended pointer on list root in chdev
1705    xptr_t      lock_xp;      // extended pointer on list lock in chdev
1706
1707    // check process is in owner cluster
1708    assert( (CXY_FROM_PID( process->pid ) == local_cxy) , __FUNCTION__ ,
1709    "process descriptor not in owner cluster" );
1710
1711    // check terminal index
1712    assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
1713    __FUNCTION__ , "illegal TXT terminal index" );
1714
1715    // get pointers on TXT_RX[txt_id] chdev
1716    chdev_xp  = chdev_dir.txt_rx[txt_id];
1717    chdev_cxy = GET_CXY( chdev_xp );
1718    chdev_ptr = GET_PTR( chdev_xp );
1719
1720    // get extended pointer on root & lock of attached process list
1721    root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1722    lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1723
1724    // insert process in attached process list
1725    remote_spinlock_lock( lock_xp );
1726    xlist_add_last( root_xp , XPTR( local_cxy , &process->txt_list ) );
1727    remote_spinlock_unlock( lock_xp );
1728
1729#if DEBUG_PROCESS_TXT
1730uint32_t cycle = (uint32_t)hal_get_cycles();
1731if( DEBUG_PROCESS_TXT < cycle )
1732printk("\n[DBG] %s : thread %x in process %x attached process %x to TXT %d / cycle %d\n",
1733__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1734process->pid, txt_id , cycle );
1735#endif
1736
1737} // end process_txt_attach()
1738
1739/////////////////////////////////////////////
1740void process_txt_detach( xptr_t  process_xp )
1741{
1742    process_t * process_ptr;  // local pointer on process in owner cluster
1743    cxy_t       process_cxy;  // process owner cluster
1744    pid_t       process_pid;  // process identifier
1745    xptr_t      file_xp;      // extended pointer on stdin file
1746    xptr_t      chdev_xp;     // extended pointer on TXT_RX chdev
1747    cxy_t       chdev_cxy;    // TXT_RX chdev cluster
1748    chdev_t *   chdev_ptr;    // local pointer on TXT_RX chdev
1749    xptr_t      lock_xp;      // extended pointer on list lock in chdev
1750
1751    // get process cluster, local pointer, and PID
1752    process_cxy = GET_CXY( process_xp );
1753    process_ptr = GET_PTR( process_xp );
1754
1755    // check process descriptor in owner cluster
1756    process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1757    assert( (CXY_FROM_PID( process_pid ) == process_cxy ) , __FUNCTION__ ,
1758    "process descriptor not in owner cluster" );
1759
1760    // release TXT ownership (does nothing if not TXT owner)
1761    process_txt_transfer_ownership( process_xp );
1762
1763    // get extended pointer on process stdin file
1764    file_xp = (xptr_t)hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1765
1766    // get pointers on TXT_RX chdev
1767    chdev_xp  = chdev_from_file( file_xp );
1768    chdev_cxy = GET_CXY( chdev_xp );
1769    chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
1770
1771    // get extended pointer on lock protecting attached process list
1772    lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1773
1774    // unlink process from attached process list
1775    remote_spinlock_lock( lock_xp );
1776    xlist_unlink( XPTR( process_cxy , &process_ptr->txt_list ) );
1777    remote_spinlock_unlock( lock_xp );
1778
1779#if DEBUG_PROCESS_TXT
1780uint32_t cycle  = (uint32_t)hal_get_cycles();
1781uint32_t txt_id = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
1782if( DEBUG_PROCESS_TXT < cycle )
1783printk("\n[DBG] %s : thread %x in process %x detached process %x from TXT %d / cycle %d\n",
1784__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1785process_pid, txt_id, cycle );
1786#endif
1787
1788} // end process_txt_detach()
1789
1790///////////////////////////////////////////////////
1791void process_txt_set_ownership( xptr_t process_xp )
1792{
1793    process_t * process_ptr;
1794    cxy_t       process_cxy;
1795    pid_t       process_pid;
1796    xptr_t      file_xp;
1797    xptr_t      txt_xp;     
1798    chdev_t   * txt_ptr;
1799    cxy_t       txt_cxy;
1800
1801    // get pointers on process in owner cluster
1802    process_cxy = GET_CXY( process_xp );
1803    process_ptr = GET_PTR( process_xp );
1804    process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1805
1806    // check owner cluster
1807    assert( (process_cxy == CXY_FROM_PID( process_pid )) , __FUNCTION__,
1808    "process descriptor not in owner cluster\n" );
1809
1810    // get extended pointer on stdin pseudo file
1811    file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1812
1813    // get pointers on TXT chdev
1814    txt_xp  = chdev_from_file( file_xp );
1815    txt_cxy = GET_CXY( txt_xp );
1816    txt_ptr = GET_PTR( txt_xp );
1817
1818    // set owner field in TXT chdev
1819    hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , process_xp );
1820
1821#if DEBUG_PROCESS_TXT
1822uint32_t cycle  = (uint32_t)hal_get_cycles();
1823uint32_t txt_id = hal_remote_lw( XPTR( txt_cxy , &txt_ptr->channel ) );
1824if( DEBUG_PROCESS_TXT < cycle )
1825printk("\n[DBG] %s : thread %x in process %x give TXT %d to process %x / cycle %d\n",
1826__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, process_pid, cycle );
1827#endif
1828
1829}  // end process_txt_set ownership()
1830
1831////////////////////////////////////////////////////////
1832void process_txt_transfer_ownership( xptr_t process_xp )
1833{
1834    process_t * process_ptr;     // local pointer on process releasing ownership
1835    cxy_t       process_cxy;     // process cluster
1836    pid_t       process_pid;     // process identifier
1837    xptr_t      file_xp;         // extended pointer on TXT_RX pseudo file
1838    xptr_t      txt_xp;          // extended pointer on TXT_RX chdev
1839    chdev_t   * txt_ptr;         // local pointer on TXT_RX chdev
1840    cxy_t       txt_cxy;         // cluster of TXT_RX chdev
1841    uint32_t    txt_id;          // TXT_RX channel
1842    xptr_t      owner_xp;        // extended pointer on current TXT_RX owner
1843    xptr_t      root_xp;         // extended pointer on root of attached process list
1844    xptr_t      lock_xp;         // extended pointer on lock protecting attached process list
1845    xptr_t      iter_xp;         // iterator for xlist
1846    xptr_t      current_xp;      // extended pointer on current process
1847    process_t * current_ptr;     // local pointer on current process
1848    cxy_t       current_cxy;     // cluster for current process
1849
1850#if DEBUG_PROCESS_TXT
1851uint32_t cycle;
1852#endif
1853
1854    // get pointers on process in owner cluster
1855    process_cxy = GET_CXY( process_xp );
1856    process_ptr = GET_PTR( process_xp );
1857    process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1858
1859    // check owner cluster
1860    assert( (process_cxy == CXY_FROM_PID( process_pid )) , __FUNCTION__,
1861    "process descriptor not in owner cluster\n" );
1862
1863    // get extended pointer on stdin pseudo file
1864    file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1865
1866    // get pointers on TXT chdev
1867    txt_xp  = chdev_from_file( file_xp );
1868    txt_cxy = GET_CXY( txt_xp );
1869    txt_ptr = GET_PTR( txt_xp );
1870
1871    // get extended pointer on TXT_RX owner and TXT channel
1872    owner_xp = hal_remote_lwd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
1873    txt_id   = hal_remote_lw ( XPTR( txt_cxy , &txt_ptr->channel ) );
1874
1875    // transfer ownership only if process is the TXT owner
1876    if( (owner_xp == process_xp) && (txt_id > 0) ) 
1877    {
1878        // get extended pointers on root and lock of attached processes list
1879        root_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.root );
1880        lock_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.lock );
1881
1882        // get lock
1883        remote_spinlock_lock( lock_xp );
1884
1885        if( process_get_ppid( process_xp ) != 1 )           // process is not KSH
1886        {
1887            // scan attached process list to find KSH process
1888            XLIST_FOREACH( root_xp , iter_xp )
1889            {
1890                current_xp  = XLIST_ELEMENT( iter_xp , process_t , txt_list );
1891                current_cxy = GET_CXY( current_xp );
1892                current_ptr = GET_PTR( current_xp );
1893
1894                if( process_get_ppid( current_xp ) == 1 )  // current is KSH
1895                {
1896                    // release lock
1897                    remote_spinlock_unlock( lock_xp );
1898
1899                    // set owner field in TXT chdev
1900                    hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
1901
1902#if DEBUG_PROCESS_TXT
1903cycle   = (uint32_t)hal_get_cycles();
1904uint32_t ksh_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1905if( DEBUG_PROCESS_TXT < cycle )
1906printk("\n[DBG] %s : thread %x in process %x release TXT %d to KSH %x / cycle %d\n",
1907__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, ksh_pid, cycle );
1908process_txt_display( txt_id );
1909#endif
1910                     return;
1911                }
1912            }
1913 
1914            // release lock
1915            remote_spinlock_unlock( lock_xp );
1916
1917            // PANIC if KSH not found
1918            assert( false , __FUNCTION__ , "KSH process not found for TXT %d" ); 
1919
1920            return;
1921        }
1922        else                                               // process is KSH
1923        {
1924            // scan attached process list to find another process
1925            XLIST_FOREACH( root_xp , iter_xp )
1926            {
1927                current_xp  = XLIST_ELEMENT( iter_xp , process_t , txt_list );
1928                current_cxy = GET_CXY( current_xp );
1929                current_ptr = GET_PTR( current_xp );
1930
1931                if( current_xp != process_xp )            // current is not KSH
1932                {
1933                    // release lock
1934                    remote_spinlock_unlock( lock_xp );
1935
1936                    // set owner field in TXT chdev
1937                    hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
1938
1939#if DEBUG_PROCESS_TXT
1940cycle   = (uint32_t)hal_get_cycles();
1941uint32_t new_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1942if( DEBUG_PROCESS_TXT < cycle )
1943printk("\n[DBG] %s : thread %x in process %x release TXT %d to process %x / cycle %d\n",
1944__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, new_pid, cycle );
1945process_txt_display( txt_id );
1946#endif
1947                     return;
1948                }
1949            }
1950
1951            // release lock
1952            remote_spinlock_unlock( lock_xp );
1953
1954            // no more owner for TXT if no other process found
1955            hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , XPTR_NULL );
1956
1957#if DEBUG_PROCESS_TXT
1958cycle = (uint32_t)hal_get_cycles();
1959if( DEBUG_PROCESS_TXT < cycle )
1960printk("\n[DBG] %s : thread %x in process %x release TXT %d to nobody / cycle %d\n",
1961__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, cycle );
1962process_txt_display( txt_id );
1963#endif
1964            return;
1965        }
1966    }
1967    else
1968    {
1969
1970#if DEBUG_PROCESS_TXT
1971cycle = (uint32_t)hal_get_cycles();
1972if( DEBUG_PROCESS_TXT < cycle )
1973printk("\n[DBG] %s : thread %x in process %d does nothing (not TXT owner) / cycle %d\n",
1974__FUNCTION__, CURRENT_THREAD->trdid, process_pid, cycle );
1975process_txt_display( txt_id );
1976#endif
1977
1978    }
1979}  // end process_txt_transfer_ownership()
1980
1981
1982//////////////////////////////////////////////////
1983uint32_t process_txt_is_owner( xptr_t process_xp )
1984{
1985    // get local pointer and cluster of process in owner cluster
1986    cxy_t       process_cxy = GET_CXY( process_xp );
1987    process_t * process_ptr = GET_PTR( process_xp );
1988
1989    // check owner cluster
1990    pid_t process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1991    assert( (process_cxy == CXY_FROM_PID( process_pid )) , __FUNCTION__,
1992    "process descriptor not in owner cluster\n" );
1993
1994    // get extended pointer on stdin pseudo file
1995    xptr_t file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1996
1997    // get pointers on TXT chdev
1998    xptr_t    txt_xp  = chdev_from_file( file_xp );
1999    cxy_t     txt_cxy = GET_CXY( txt_xp );
2000    chdev_t * txt_ptr = GET_PTR( txt_xp );
2001
2002    // get extended pointer on TXT_RX owner process
2003    xptr_t owner_xp = hal_remote_lwd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2004
2005    return (process_xp == owner_xp);
2006
2007}   // end process_txt_is_owner()
2008
2009////////////////////////////////////////////////     
2010xptr_t process_txt_get_owner( uint32_t channel )
2011{
2012    xptr_t      txt_rx_xp  = chdev_dir.txt_rx[channel];
2013    cxy_t       txt_rx_cxy = GET_CXY( txt_rx_xp );
2014    chdev_t *   txt_rx_ptr = GET_PTR( txt_rx_xp );
2015
2016    return (xptr_t)hal_remote_lwd( XPTR( txt_rx_cxy , &txt_rx_ptr->ext.txt.owner_xp ) );
2017
2018}  // end process_txt_get_owner()
2019
2020///////////////////////////////////////////
2021void process_txt_display( uint32_t txt_id )
2022{
2023    xptr_t      chdev_xp;
2024    cxy_t       chdev_cxy;
2025    chdev_t   * chdev_ptr;
2026    xptr_t      root_xp;
2027    xptr_t      lock_xp;
2028    xptr_t      current_xp;
2029    xptr_t      iter_xp;
2030    cxy_t       txt0_cxy;
2031    chdev_t   * txt0_ptr;
2032    xptr_t      txt0_xp;
2033    xptr_t      txt0_lock_xp;
2034    reg_t       txt0_save_sr;    // save SR to take TXT0 lock in busy mode
2035   
2036    assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
2037    __FUNCTION__ , "illegal TXT terminal index" );
2038
2039    // get pointers on TXT0 chdev
2040    txt0_xp  = chdev_dir.txt_tx[0];
2041    txt0_cxy = GET_CXY( txt0_xp );
2042    txt0_ptr = GET_PTR( txt0_xp );
2043
2044    // get extended pointer on TXT0 lock
2045    txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2046
2047    // get pointers on TXT_RX[txt_id] chdev
2048    chdev_xp  = chdev_dir.txt_rx[txt_id];
2049    chdev_cxy = GET_CXY( chdev_xp );
2050    chdev_ptr = GET_PTR( chdev_xp );
2051
2052    // get extended pointer on root & lock of attached process list
2053    root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2054    lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2055
2056    // get lock on attached process list
2057    remote_spinlock_lock( lock_xp );
2058
2059    // get TXT0 lock in busy waiting mode
2060    remote_spinlock_lock_busy( txt0_lock_xp , &txt0_save_sr );
2061
2062    // display header
2063    nolock_printk("\n***** processes attached to TXT_%d / cycle %d\n",
2064    txt_id , (uint32_t)hal_get_cycles() );
2065
2066    // scan attached process list
2067    XLIST_FOREACH( root_xp , iter_xp )
2068    {
2069        current_xp  = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2070        process_display( current_xp );
2071    }
2072
2073    // release TXT0 lock in busy waiting mode
2074    remote_spinlock_unlock_busy( txt0_lock_xp , txt0_save_sr );
2075
2076    // release lock on attached process list
2077    remote_spinlock_unlock( lock_xp );
2078
2079}  // end process_txt_display
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