source: trunk/kernel/kern/process.c @ 373

Last change on this file since 373 was 373, checked in by max@…, 5 years ago

Start using panic().

File size: 25.3 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)
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_types.h>
28#include <hal_remote.h>
29#include <hal_uspace.h>
30#include <errno.h>
31#include <printk.h>
32#include <memcpy.h>
33#include <bits.h>
34#include <kmem.h>
35#include <page.h>
36#include <vmm.h>
37#include <vfs.h>
38#include <core.h>
39#include <thread.h>
40#include <list.h>
41#include <scheduler.h>
42#include <remote_spinlock.h>
43#include <dqdt.h>
44#include <cluster.h>
45#include <ppm.h>
46#include <boot_info.h>
47#include <process.h>
48#include <elf.h>
49#include <syscalls.h>
50
51//////////////////////////////////////////////////////////////////////////////////////////
52// Extern global variables
53//////////////////////////////////////////////////////////////////////////////////////////
54
55extern process_t process_zero;
56
57//////////////////////////////////////////////////////////////////////////////////////////
58// Process initialisation related functions
59//////////////////////////////////////////////////////////////////////////////////////////
60
61///////////////////////////
62process_t * process_alloc()
63{
64        kmem_req_t   req;
65
66    req.type  = KMEM_PROCESS;
67        req.size  = sizeof(process_t);
68        req.flags = AF_KERNEL;
69
70    return (process_t *)kmem_alloc( &req );
71}
72
73////////////////////////////////////////
74void process_free( process_t * process )
75{
76    kmem_req_t  req;
77
78        req.type = KMEM_PROCESS;
79        req.ptr  = process;
80        kmem_free( &req );
81}
82
83/////////////////////////////////////////////////
84void process_reference_init( process_t * process,
85                             pid_t       pid,
86                             xptr_t      parent_xp )
87{
88    cxy_t       parent_cxy;
89    process_t * parent_ptr;
90    pid_t       parent_pid;
91
92    process_dmsg("\n[INFO] %s : enters for process %x in cluster %x\n",
93                 __FUNCTION__ , pid , local_cxy );
94
95    // get parent process cluster, local pointer, and pid
96    // for all processes other than process_zero
97    if( process == &process_zero )
98    {
99        assert( (pid == 0) , __FUNCTION__ , "process_zero must have PID = 0\n");
100
101        parent_cxy = 0;
102        parent_ptr = NULL;
103        parent_pid = 0;      // process_zero is its own parent...
104    }
105    else
106    {
107        assert( (parent_xp != XPTR_NULL) , __FUNCTION__ , "parent_xp cannot be NULL\n");
108
109        parent_cxy = GET_CXY( parent_xp );
110        parent_ptr = (process_t *)GET_PTR( parent_xp );
111        parent_pid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
112    }
113
114    // initialize PID and PPID
115        process->pid   = pid;
116    process->ppid  = parent_pid;
117
118    // reset reference process vmm (not for kernel process)
119    if( pid ) vmm_init( process );
120
121    // reset reference process file descriptors array
122        process_fd_init( process );
123
124    // reset reference process files structures and cwd_lock
125        process->vfs_root_xp     = XPTR_NULL;
126        process->vfs_bin_xp      = XPTR_NULL;
127        process->vfs_cwd_xp      = XPTR_NULL;
128    remote_rwlock_init( XPTR( local_cxy , &process->cwd_lock ) );
129
130    // reset children list root
131    xlist_root_init( XPTR( local_cxy , &process->children_root ) );
132        process->children_nr     = 0;
133
134    // reset semaphore / mutex / barrier / condvar list roots
135    xlist_root_init( XPTR( local_cxy , &process->sem_root ) );
136    xlist_root_init( XPTR( local_cxy , &process->mutex_root ) );
137    xlist_root_init( XPTR( local_cxy , &process->barrier_root ) );
138    xlist_root_init( XPTR( local_cxy , &process->condvar_root ) );
139    remote_spinlock_init( XPTR( local_cxy , &process->sync_lock ) );
140
141    // register new process in the parent children list (not for kernel process)
142    if( pid )
143    {
144        xptr_t entry = XPTR( local_cxy  , &process->brothers_list );
145        xptr_t root  = XPTR( parent_cxy , &parent_ptr->children_root );
146        xlist_add_first( root , entry );
147    }
148
149    // reset th_tbl[] array as empty
150    uint32_t i;
151    for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
152        {
153        process->th_tbl[i] = NULL;
154    }
155    process->th_nr  = 0;
156    spinlock_init( &process->th_lock );
157
158    // set ref_xp field
159    process->ref_xp = XPTR( local_cxy , process );
160
161    // register new process descriptor in local cluster manager local_list
162    cluster_process_local_link( process );
163
164    // register new process descriptor in owner cluster manager copies_list
165    cluster_process_copies_link( process );
166
167    // initialize signal manager TODO [AG]
168
169        hal_fence();
170
171    process_dmsg("\n[INFO] %s : exit for process %x in cluster %x\n",
172                 __FUNCTION__ , pid );
173
174}  // process_reference init()
175
176/////////////////////////////////////////////////////
177error_t process_copy_init( process_t * local_process,
178                           xptr_t      reference_process_xp )
179{
180    // get reference process cluster and local pointer
181    cxy_t       ref_cxy = GET_CXY( reference_process_xp );
182    process_t * ref_ptr = (process_t *)GET_PTR( reference_process_xp );
183
184    // reset local process vmm
185    vmm_init( local_process );
186
187    // reset process file descriptors array
188        process_fd_init( local_process );
189
190    // reset vfs_root_xp / vfs_bin_xp / vfs_cwd_xp fields
191    local_process->vfs_root_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_root_xp ) );
192    local_process->vfs_bin_xp  = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_bin_xp ) );
193    local_process->vfs_cwd_xp  = XPTR_NULL;
194
195    // set the pid, ppid, ref_xp fields
196    local_process->pid    = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->pid ) );
197    local_process->ppid   = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->ppid ) );
198    local_process->ref_xp = reference_process_xp;
199
200    process_dmsg("\n[INFO] %s : enter for process %x in cluster %x\n",
201                 __FUNCTION__ , local_process->pid );
202
203    // reset children list root (not used in a process descriptor copy)
204    xlist_root_init( XPTR( local_cxy , &local_process->children_root ) );
205    local_process->children_nr   = 0;
206
207    // reset brothers list (not used in a process descriptor copy)
208    xlist_entry_init( XPTR( local_cxy , &local_process->brothers_list ) );
209
210    // reset semaphores list root (not used in a process descriptor copy)
211    xlist_root_init( XPTR( local_cxy , &local_process->sem_root ) );
212    xlist_root_init( XPTR( local_cxy , &local_process->mutex_root ) );
213    xlist_root_init( XPTR( local_cxy , &local_process->barrier_root ) );
214    xlist_root_init( XPTR( local_cxy , &local_process->condvar_root ) );
215
216    // reset th_tbl[] array as empty
217    uint32_t i;
218    for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
219        {
220        local_process->th_tbl[i] = NULL;
221    }
222    local_process->th_nr  = 0;
223    spinlock_init( &local_process->th_lock );
224
225    // register new process descriptor in local cluster manager local_list
226    cluster_process_local_link( local_process );
227
228    // register new process descriptor in owner cluster manager copies_list
229    cluster_process_copies_link( local_process );
230
231    // initialize signal manager TODO [AG]
232
233        hal_fence();
234
235    process_dmsg("\n[INFO] %s : exit for process %x in cluster %x\n",
236                 __FUNCTION__ , local_process->pid );
237
238    return 0;
239
240} // end process_copy_init()
241
242///////////////////////////////////////////
243void process_destroy( process_t * process )
244{
245        if( process->th_nr != 0 )
246    {
247        panic("process %x in cluster %x has still active threads\n",
248              process->pid , local_cxy );
249    }
250
251    // get local process manager pointer
252    pmgr_t * pmgr = &LOCAL_CLUSTER->pmgr;
253
254    // get the lock protecting the list of local process descriptors
255    remote_spinlock_lock( XPTR( local_cxy , &pmgr->local_lock ) );
256
257    // remove the process descriptor from local_list in local cluster manager
258    xlist_unlink( XPTR( local_cxy , &process->local_list ) );
259
260    // release the lock protecting the list of local process descriptors
261    remote_spinlock_unlock( XPTR( local_cxy , &pmgr->local_lock ) );
262
263    // get extended pointer on copies_lock in owner cluster manager
264    cxy_t  owner_cxy    = CXY_FROM_PID( process->pid );
265        lpid_t lpid         = LPID_FROM_PID( process->pid );
266    xptr_t copies_lock  = XPTR( owner_cxy , &pmgr->copies_lock[lpid] );
267
268    // remove the local process descriptor from copies_list
269    remote_spinlock_lock( copies_lock );
270    xlist_unlink( XPTR( local_cxy , &process->copies_list ) );
271    remote_spinlock_unlock( copies_lock );
272
273    // synchronize memory
274        hal_fence();
275
276    // From this point, the process descriptor is unreachable
277
278    // close all open files and update dirty TODO [AG]
279
280    // release signal manager TODO [AG]
281
282    // Decrease refcount for bin file, root file and cwd file
283        if( process->vfs_bin_xp  != XPTR_NULL ) vfs_file_count_down( process->vfs_bin_xp );
284        if( process->vfs_root_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_root_xp );
285        if( process->vfs_cwd_xp  != XPTR_NULL ) vfs_file_count_down( process->vfs_cwd_xp );
286
287    // Destroy VMM
288    vmm_destroy( process );
289
290        process_dmsg("\n[INFO] %s for pid %d / page_faults = %d\n",
291                 __FUNCTION__ , process->pid, process->vmm.pgfault_nr );
292}
293
294////////////////////////////////////////
295void process_kill( process_t * process )
296{
297    thread_t     * thread;    // pointer on current thead descriptor
298    uint32_t       ltid;      // index in process th_tbl
299    uint32_t       count;     // thread counter
300
301    // get lock protecting th_tbl[]
302    spinlock_lock( &process->th_lock );
303
304    // first loop on threads to send the THREAD_SIG_KILL signal to all process threads
305    // we use both "ltid" and "count" indexes, because it can exist "holes" in th_tbl
306    for( ltid = 0 , count = 0  ;
307         (ltid < CONFIG_THREAD_MAX_PER_CLUSTER) && (count < process->th_nr) ;
308         ltid++ )
309    {
310        thread = process->th_tbl[ltid];
311
312        if( thread != NULL )
313        {
314            thread_kill( thread );
315            count++;
316        }
317    }
318
319    volatile uint32_t ko;
320
321    // second loop on threads to wait acknowledge from scheduler,
322    // unlink thread from process and parent thread, and release thread descriptor
323    for( ltid = 0 , count = 0  ;
324         (ltid < CONFIG_THREAD_MAX_PER_CLUSTER) && (count < process->th_nr) ;
325         ltid++ )
326    {
327        thread = process->th_tbl[ltid];
328
329        if( thread != NULL )
330        {
331            // wait scheduler acknowledge
332            do { ko = (thread->signals & THREAD_SIG_KILL); } while( ko );
333
334            // unlink thread from brothers list if required
335            if( (thread->flags & THREAD_FLAG_DETACHED) == 0 )
336            xlist_unlink( XPTR( local_cxy , &thread->brothers_list ) );
337
338            // unlink thread from process
339            process_remove_thread( thread );
340
341            // release memory for thread descriptor
342            thread_destroy( thread );
343
344            count++;
345        }
346    }
347
348    // release lock protecting th_tbl[]
349    spinlock_unlock( &process->th_lock );
350
351    // release memory allocated for process descriptor
352    process_destroy( process );
353}
354
355///////////////////////////////////////////////
356process_t * process_get_local_copy( pid_t pid )
357{
358    error_t        error;
359    process_t    * process_ptr;   // local pointer on process
360    xptr_t         process_xp;    // extended pointer on process
361
362    cluster_t * cluster = LOCAL_CLUSTER;
363
364    // get lock protecting local list of processes
365    remote_spinlock_lock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
366
367    // scan the local list of process descriptors to find the process
368    xptr_t  iter;
369    bool_t  found = false;
370    XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter )
371    {
372        process_xp  = XLIST_ELEMENT( iter , process_t , local_list );
373        process_ptr = (process_t *)GET_PTR( process_xp );
374        if( process_ptr->pid == pid )
375        {
376            found = true;
377            break;
378        }
379    }
380
381    // release lock protecting local list of processes
382    remote_spinlock_unlock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
383
384    // allocate memory for a new local process descriptor
385    // and initialise it from reference cluster if required
386    if( !found )
387    {
388        // get extended pointer on reference process descriptor
389        xptr_t ref_xp = cluster_get_reference_process_from_pid( pid );
390
391        assert( (ref_xp != XPTR_NULL) , __FUNCTION__ , "illegal pid\n" );
392
393        // allocate memory for local process descriptor
394        process_ptr = process_alloc();
395        if( process_ptr == NULL )  return NULL;
396
397        // initialize local process descriptor copy
398        error = process_copy_init( process_ptr , ref_xp );
399        if( error ) return NULL;
400    }
401
402    return process_ptr;
403}
404
405//////////////////////////////////////////////////////////////////////////////////////////
406// File descriptor array related functions
407//////////////////////////////////////////////////////////////////////////////////////////
408
409///////////////////////////////////////////
410void process_fd_init( process_t * process )
411{
412    uint32_t fd;
413
414    remote_spinlock_init( XPTR( local_cxy , &process->fd_array.lock ) );
415
416    process->fd_array.current = 0;
417
418    // initialize array
419    for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
420    {
421        process->fd_array.array[fd] = XPTR_NULL;
422    }
423}
424
425//////////////////////////////
426bool_t process_fd_array_full()
427{
428    // get extended pointer on reference process
429    xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
430
431    // get reference process cluster and local pointer
432    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
433    cxy_t       ref_cxy = GET_CXY( ref_xp );
434
435    // get number of open file descriptors from reference fd_array
436    uint32_t current = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->fd_array.current ) );
437
438        return ( current >= CONFIG_PROCESS_FILE_MAX_NR );
439}
440
441/////////////////////////////////////////////////
442error_t process_fd_register(  xptr_t     file_xp,
443                              uint32_t * file_id )
444{
445    bool_t    found;
446    uint32_t  id;
447    xptr_t    xp;
448
449    // get extended pointer on reference process
450    xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
451
452    // get reference process cluster and local pointer
453    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
454    cxy_t       ref_cxy = GET_CXY( ref_xp );
455
456    // take lock protecting reference fd_array
457        remote_spinlock_lock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
458
459    found   = false;
460
461    for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ )
462    {
463        xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) );
464        if ( xp == XPTR_NULL )
465        {
466            found = true;
467            hal_remote_swd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) , file_xp );
468                hal_remote_atomic_add( XPTR( ref_cxy , &ref_ptr->fd_array.current ) , 1 );
469                        *file_id = id;
470            break;
471        }
472    }
473
474    // release lock protecting reference fd_array
475        remote_spinlock_unlock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
476
477    if ( !found ) return EMFILE;
478    else          return 0;
479}
480
481////////////////////////////////////////////////
482xptr_t process_fd_get_xptr( process_t * process,
483                            uint32_t    file_id )
484{
485    xptr_t  file_xp;
486
487    // access local copy of process descriptor
488    file_xp = process->fd_array.array[file_id];
489
490    if( file_xp == XPTR_NULL )
491    {
492        // get reference process cluster and local pointer
493        xptr_t      ref_xp  = process->ref_xp;
494        cxy_t       ref_cxy = GET_CXY( ref_xp );
495        process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
496
497        // access reference process descriptor
498        file_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[file_id] ) );
499
500        // update local fd_array if found
501        if( file_xp != XPTR_NULL )
502        {
503            process->fd_array.array[file_id] = file_xp;
504        }
505    }
506
507    return file_xp;
508}
509
510///////////////////////////////////////////
511void process_fd_remote_copy( xptr_t dst_xp,
512                             xptr_t src_xp )
513{
514    uint32_t fd;
515    xptr_t   entry;
516
517    // get cluster and local pointer for src fd_array
518    cxy_t        src_cxy = GET_CXY( src_xp );
519    fd_array_t * src_ptr = (fd_array_t *)GET_PTR( src_xp );
520
521    // get cluster and local pointer for dst fd_array
522    cxy_t        dst_cxy = GET_CXY( dst_xp );
523    fd_array_t * dst_ptr = (fd_array_t *)GET_PTR( dst_xp );
524
525    // get the remote lock protecting the src fd_array
526        remote_spinlock_lock( XPTR( src_cxy , &src_ptr->lock ) );
527
528    // loop on all entries in source process fd_array
529    for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
530        {
531                entry = (xptr_t)hal_remote_lwd( XPTR( src_cxy , &src_ptr->array[fd] ) );
532
533                if( entry != XPTR_NULL )
534                {
535            // increment file descriptor ref count
536            vfs_file_count_up( entry );
537
538                        // copy entry in destination process fd_array
539                        hal_remote_swd( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry );
540                }
541        }
542
543    // release lock on source process fd_array
544        remote_spinlock_unlock( XPTR( src_cxy , &src_ptr->lock ) );
545}
546
547////////////////////////////////////////////////////////////////////////////////////
548//  Thread related functions
549////////////////////////////////////////////////////////////////////////////////////
550
551/////////////////////////////////////////////////////
552error_t process_register_thread( process_t * process,
553                                 thread_t  * thread,
554                                 trdid_t   * trdid )
555{
556    ltid_t   ltid;
557    bool_t   found;
558
559    assert( (process != NULL) , __FUNCTION__ , "process argument is NULL" );
560
561    assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" );
562
563    // search a free slot in th_tbl[]
564    found = false;
565    for( ltid = 0 ; ltid < CONFIG_THREAD_MAX_PER_CLUSTER ; ltid++ )
566    {
567        if( process->th_tbl[ltid] == NULL )
568        {
569            found = true;
570            break;
571        }
572    }
573
574    if( found )
575    {
576        // register thread in th_tbl[]
577        process->th_tbl[ltid] = thread;
578        process->th_nr++;
579
580        // returns trdid
581        *trdid = TRDID( local_cxy , ltid );
582    }
583
584    return (found) ? 0 : ENOMEM;
585
586}  // end process_register_thread()
587
588///////////////////////////////////////////////
589void process_remove_thread( thread_t * thread )
590{
591    assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" );
592
593    process_t * process = thread->process;
594
595    // get thread local index
596    ltid_t  ltid = LTID_FROM_TRDID( thread->trdid );
597
598    // remove thread from th_tbl[]
599    process->th_tbl[ltid] = NULL;
600    process->th_nr--;
601
602}  // process_remove_thread()
603
604/////////////////////////////////////////////////////
605error_t process_make_exec( exec_info_t  * exec_info )
606{
607    char           * path;                            // pathname to .elf file
608    process_t      * process;                         // local pointer on new process
609    pid_t            pid;                             // new process pid
610    xptr_t           parent_xp;                       // extended pointer on parent process
611    cxy_t            parent_cxy;
612    process_t      * parent_ptr;
613    uint32_t         parent_pid;
614    thread_t       * thread;                          // pointer on new thread
615    pthread_attr_t   attr;                            // main thread attributes
616    core_t         * core;                            // pointer on selected core
617    lid_t            lid;                             // selected core local index
618        error_t          error;
619
620        // get parent and .elf pathname from exec_info
621        path      = exec_info->path;
622    parent_xp = exec_info->parent_xp;
623
624    // get parent process cluster and local pointer
625    parent_cxy = GET_CXY( parent_xp );
626    parent_ptr = (process_t *)GET_PTR( parent_xp );
627    parent_pid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
628
629    exec_dmsg("\n[INFO] %s : thread %x on core[%x,‰d] enters for path = %s\n",
630    __FUNCTION__, CURRENT_THREAD->trdid, local_cxy, CURRENT_THREAD->core->lid, path );
631
632    // create new process descriptor
633    process = process_alloc();
634
635    if( process == NULL )
636    {
637        printk("\n[ERROR] in %s : no memory / cluster = %x / ppid = %x / path = %s\n",
638               __FUNCTION__ , local_cxy , parent_pid , path );
639        return ENOMEM;
640    }
641
642    // get a pid from the local cluster
643    error = cluster_pid_alloc( XPTR( local_cxy , process ) , &pid );
644
645    if( error )
646    {
647        printk("\n[ERROR] in %s : cannot get PID / cluster = %x / ppid = %x / path = %s\n",
648               __FUNCTION__ , local_cxy , parent_pid , path );
649        process_free( process );
650                return ENOMEM;
651    }
652
653    // initialize the process descriptor as the reference
654    process_reference_init( process , pid , parent_xp );
655
656    exec_dmsg("\n[INFO] %s : thread %x on core[%x,‰d] created process %x / path = %s\n",
657    __FUNCTION__, CURRENT_THREAD->trdid, local_cxy, CURRENT_THREAD->core->lid, pid, path );
658
659    // initialize vfs_root and vfs_cwd from parent process
660    xptr_t  vfs_root_xp = hal_remote_lwd( XPTR( parent_cxy , &parent_ptr->vfs_root_xp ) );
661        vfs_file_count_up( vfs_root_xp );
662        process->vfs_root_xp = vfs_root_xp;
663
664    xptr_t  vfs_cwd_xp = hal_remote_lwd( XPTR( parent_cxy , &parent_ptr->vfs_cwd_xp ) );
665        vfs_file_count_up( vfs_cwd_xp );
666        process->vfs_cwd_xp = vfs_cwd_xp;
667
668    // initialize embedded fd_array from parent process
669    process_fd_remote_copy( XPTR( local_cxy  , &process->fd_array ),
670                            XPTR( parent_cxy , &parent_ptr->fd_array) );
671
672    exec_dmsg("\n[INFO] %s : fd_array copied from process %x to process %x\n",
673    __FUNCTION__, parent_pid , pid );
674
675        // initialize signal manager TODO ??? [AG]
676        // signal_manager_init( process );
677
678    // register "code" and "data" vsegs as well as the process entry-point in VMM,
679    // using information contained in the elf file.
680        error = elf_load_process( path , process );
681
682        if( error )
683        {
684                printk("\n[ERROR] in %s : failed to access elf file for process %x / path = %s\n",
685                       __FUNCTION__, pid , path );
686        process_destroy( process );
687        return error;
688        }
689
690    exec_dmsg("\n[INFO] %s : code and data vsegs registered for process %x / path = %s\n",
691    __FUNCTION__ , pid , path );
692
693    // select a core in cluster
694    lid  = cluster_select_local_core();
695    core = &LOCAL_CLUSTER->core_tbl[lid];
696
697    // initialize pthread attributes for main thread
698    attr.attributes = PT_ATTR_DETACH | PT_ATTR_CLUSTER_DEFINED | PT_ATTR_CORE_DEFINED;
699    attr.cxy        = local_cxy;
700    attr.lid        = lid;
701
702    // create and initialize thread descriptor
703        error = thread_user_create( pid,
704                                (void *)process->vmm.entry_point,
705                                exec_info->args_pointers,
706                                &attr,
707                                &thread );
708        if( error )
709        {
710                printk("\n[ERROR] in %s : cannot create thread for process %x / path = %s\n",
711                       __FUNCTION__, pid );
712        process_destroy( process );
713        return error;
714        }
715
716        exec_dmsg("\n[INFO] %s : thread created for process %x on core %d in cluster %x\n",
717               __FUNCTION__ , pid , core->lid , local_cxy );
718
719    // update children list in parent process
720        xlist_add_last( XPTR( parent_cxy , &parent_ptr->children_root ),
721                    XPTR( local_cxy  , &process->brothers_list ) );
722        hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr) , 1 );
723
724    // activate new thread
725        thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL );
726
727    exec_dmsg("\n[INFO] %s : exit for process %x\n",
728                __FUNCTION__, process->pid );
729
730        return 0;
731
732}  // end proces_make_exec()
733
734//////////////////////////
735void process_init_create()
736{
737    exec_info_t   exec_info;     // structure to be passed to process_make_exec()
738
739        error_t   error1;
740        error_t   error2;
741        error_t   error3;
742    xptr_t    stdin_xp;
743    xptr_t    stdout_xp;
744    xptr_t    stderr_xp;
745    uint32_t  stdin_id;
746    uint32_t  stdout_id;
747    uint32_t  stderr_id;
748
749        process_dmsg("\n[INFO] %s : enters in cluster %x\n", __FUNCTION__ , local_cxy );
750
751    // open stdin / stdout / stderr pseudo-files
752        error1 = vfs_open( XPTR_NULL, CONFIG_DEV_STDIN , O_RDONLY, 0, &stdin_xp , &stdin_id  );
753        error2 = vfs_open( XPTR_NULL, CONFIG_DEV_STDOUT, O_WRONLY, 0, &stdout_xp, &stdout_id );
754        error3 = vfs_open( XPTR_NULL, CONFIG_DEV_STDERR, O_WRONLY, 0, &stderr_xp, &stderr_id );
755
756        assert( ((error1 == 0) && (error2 == 0) && (error3 == 0)) , __FUNCTION__ ,
757            "cannot open stdin/stdout/stderr pseudo files\n");
758
759    assert( ((stdin_id == 0) && (stdout_id == 1) && (stderr_id == 2)) , __FUNCTION__ ,
760            "bad indexes for stdin/stdout/stderr\n");
761
762    // initialize the exec_info structure
763    exec_info.parent_xp    = XPTR( local_cxy , &process_zero );
764    strcpy( exec_info.path , CONFIG_PROCESS_INIT_PATH );
765    exec_info.args_nr      = 0;
766    exec_info.envs_nr      = 0;
767
768    // create process_init and thread_init
769        error1 = process_make_exec( &exec_info );
770
771        assert( (error1 == 0) , __FUNCTION__ , "cannot create process_init\n");
772
773        process_dmsg("\n[INFO] %s : exit in cluster %x\n", __FUNCTION__ , local_cxy );
774               
775    hal_fence();
776
777}  // end process_init_create()
778
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