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source: trunk/kernel/kern/process.c @ 471

Last change on this file since 471 was 469, checked in by alain, 6 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
59	extern process_t process_zero; // allocated in kernel_init.c
60	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
61
62	//////////////////////////////////////////////////////////////////////////////////////////
63	// Process initialisation related functions
64	//////////////////////////////////////////////////////////////////////////////////////////
65
66	///////////////////////////
67	process_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	////////////////////////////////////////
79	void 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	/////////////////////////////////////////////////
89	void 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
119	uint32_t cycle = (uint32_t)hal_get_cycles();
120	if( DEBUG_PROCESS_REFERENCE_INIT )
121	printk("\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)
137	cycle = (uint32_t)hal_get_cycles();
138	if( DEBUG_PROCESS_REFERENCE_INIT )
139	printk("\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)
157	cycle = (uint32_t)hal_get_cycles();
158	if( DEBUG_PROCESS_REFERENCE_INIT )
159	printk("\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)
181	cycle = (uint32_t)hal_get_cycles();
182	if( DEBUG_PROCESS_REFERENCE_INIT )
183	printk("\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)
199	cycle = (uint32_t)hal_get_cycles();
200	if( DEBUG_PROCESS_REFERENCE_INIT )
201	printk("\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)
217	cycle = (uint32_t)hal_get_cycles();
218	if( DEBUG_PROCESS_REFERENCE_INIT )
219	printk("\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)
258	cycle = (uint32_t)hal_get_cycles();
259	if( DEBUG_PROCESS_REFERENCE_INIT )
260	printk("\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)
298	cycle = (uint32_t)hal_get_cycles();
299	if( DEBUG_PROCESS_REFERENCE_INIT )
300	printk("\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	/////////////////////////////////////////////////////
307	error_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
324	uint32_t cycle = (uint32_t)hal_get_cycles();
325	if( DEBUG_PROCESS_COPY_INIT )
326	printk("\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
374	cycle = (uint32_t)hal_get_cycles();
375	if( DEBUG_PROCESS_COPY_INIT )
376	printk("\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	///////////////////////////////////////////
385	void 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
399	uint32_t cycle = (uint32_t)hal_get_cycles();
400	if( DEBUG_PROCESS_DESTROY )
401	printk("\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
449	cycle = (uint32_t)hal_get_cycles();
450	if( DEBUG_PROCESS_DESTROY )
451	printk("\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	/////////////////////////////////////////////////
458	char * 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	////////////////////////////////////////
467	void 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
492	uint32_t cycle = (uint32_t)hal_get_cycles();
493	if( DEBUG_PROCESS_SIGACTION < cycle )
494	printk("\n[DBG] %s : thread %x in process %x enter to %s process %x / cycle %d\n",
495	__FUNCTION__ , client->trdid, client->process->pid,
496	process_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
563	if( DEBUG_PROCESS_SIGACTION < cycle )
564	printk("\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
595	if( DEBUG_PROCESS_SIGACTION < cycle )
596	printk("\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
605	cycle = (uint32_t)hal_get_cycles();
606	if( DEBUG_PROCESS_SIGACTION < cycle )
607	printk("\n[DBG] %s : thread %x in process %x exit after %s process %x / cycle %d\n",
608	__FUNCTION__, client->trdid, client->process->pid,
609	process_action_str( type ), pid, cycle );
610	#endif
611
612	} // end process_sigaction()
613
614	/////////////////////////////////////////////////
615	void 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
632	uint32_t cycle = (uint32_t)hal_get_cycles();
633	if( DEBUG_PROCESS_SIGACTION < cycle )
634	printk("\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
693	cycle = (uint32_t)hal_get_cycles();
694	if( DEBUG_PROCESS_SIGACTION < cycle )
695	printk("\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	/////////////////////////////////////////////////
702	void 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
719	uint32_t cycle = (uint32_t)hal_get_cycles();
720	if( DEBUG_PROCESS_SIGACTION < cycle )
721	printk("\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
753	cycle = (uint32_t)hal_get_cycles();
754	if( DEBUG_PROCESS_SIGACTION < cycle )
755	printk("\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	///////////////////////////////////////////////////
762	void 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
773	uint32_t cycle = (uint32_t)hal_get_cycles();
774	if( DEBUG_PROCESS_SIGACTION < cycle )
775	printk("\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
801	cycle = (uint32_t)hal_get_cycles();
802	if( DEBUG_PROCESS_SIGACTION < cycle )
803	printk("\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	///////////////////////////////////////////////
810	process_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
859	uint32_t cycle = (uint32_t)hal_get_cycles();
860	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
861	printk("\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	////////////////////////////////////////////
870	pid_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	///////////////////////////////////////////
895	void 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	//////////////////////////////
911	bool_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	/////////////////////////////////////////////////
927	error_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	////////////////////////////////////////////////
966	xptr_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	///////////////////////////////////////////
996	void 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	/////////////////////////////////////////////////////
1038	error_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	/////////////////////////////////////////////////
1081	bool_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	/////////////////////////////////////////////////////////
1112	error_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
1140	uint32_t cycle = (uint32_t)hal_get_cycles();
1141	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1142	printk("\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 )
1166	cycle = (uint32_t)hal_get_cycles();
1167	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1168	printk("\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 )
1178	cycle = (uint32_t)hal_get_cycles();
1179	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1180	printk("\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 )
1200	cycle = (uint32_t)hal_get_cycles();
1201	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1202	printk("\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,
1204	parent_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 )
1213	cycle = (uint32_t)hal_get_cycles();
1214	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1215	printk("\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,
1217	parent_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
1244	cycle = (uint32_t)hal_get_cycles();
1245	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1246	printk("\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 )
1266	cycle = (uint32_t)hal_get_cycles();
1267	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1268	printk("\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
1288	cycle = (uint32_t)hal_get_cycles();
1289	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1290	printk("\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	/////////////////////////////////////////////////////
1299	error_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
1322	uint32_t cycle = (uint32_t)hal_get_cycles();
1323	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1324	printk("\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)
1344	cycle = (uint32_t)hal_get_cycles();
1345	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1346	printk("\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)
1354	cycle = (uint32_t)hal_get_cycles();
1355	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1356	printk("\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 )
1364	cycle = (uint32_t)hal_get_cycles();
1365	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1366	printk("\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 )
1381	cycle = (uint32_t)hal_get_cycles();
1382	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1383	printk("\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 )
1399	cycle = (uint32_t)hal_get_cycles();
1400	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1401	printk("\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	///////////////////////////////////////////////
1425	void process_zero_create( process_t * process )
1426	{
1427
1428	#if DEBUG_PROCESS_ZERO_CREATE
1429	uint32_t cycle = (uint32_t)hal_get_cycles();
1430	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1431	printk("\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
1458	cycle = (uint32_t)hal_get_cycles();
1459	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1460	printk("\n[DBG] %s : thread %x exit / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1461	#endif
1462
1463	} // end process_zero_init()
1464
1465	//////////////////////////
1466	void 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
1478	uint32_t cycle = (uint32_t)hal_get_cycles();
1479	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1480	printk("\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
1561	cycle = (uint32_t)hal_get_cycles();
1562	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1563	printk("\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	/////////////////////////////////////////
1570	void 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	////////////////////////////
1668	uint32_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	/////////////////////////////////////////////
1698	void 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
1730	uint32_t cycle = (uint32_t)hal_get_cycles();
1731	if( DEBUG_PROCESS_TXT < cycle )
1732	printk("\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,
1734	process->pid, txt_id , cycle );
1735	#endif
1736
1737	} // end process_txt_attach()
1738
1739	/////////////////////////////////////////////
1740	void 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
1780	uint32_t cycle = (uint32_t)hal_get_cycles();
1781	uint32_t txt_id = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
1782	if( DEBUG_PROCESS_TXT < cycle )
1783	printk("\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,
1785	process_pid, txt_id, cycle );
1786	#endif
1787
1788	} // end process_txt_detach()
1789
1790	///////////////////////////////////////////////////
1791	void 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
1822	uint32_t cycle = (uint32_t)hal_get_cycles();
1823	uint32_t txt_id = hal_remote_lw( XPTR( txt_cxy , &txt_ptr->channel ) );
1824	if( DEBUG_PROCESS_TXT < cycle )
1825	printk("\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	////////////////////////////////////////////////////////
1832	void 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
1851	uint32_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
1903	cycle = (uint32_t)hal_get_cycles();
1904	uint32_t ksh_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1905	if( DEBUG_PROCESS_TXT < cycle )
1906	printk("\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 );
1908	process_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
1940	cycle = (uint32_t)hal_get_cycles();
1941	uint32_t new_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1942	if( DEBUG_PROCESS_TXT < cycle )
1943	printk("\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 );
1945	process_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
1958	cycle = (uint32_t)hal_get_cycles();
1959	if( DEBUG_PROCESS_TXT < cycle )
1960	printk("\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 );
1962	process_txt_display( txt_id );
1963	#endif
1964	return;
1965	}
1966	}
1967	else
1968	{
1969
1970	#if DEBUG_PROCESS_TXT
1971	cycle = (uint32_t)hal_get_cycles();
1972	if( DEBUG_PROCESS_TXT < cycle )
1973	printk("\n[DBG] %s : thread %x in process %d does nothing (not TXT owner) / cycle %d\n",
1974	__FUNCTION__, CURRENT_THREAD->trdid, process_pid, cycle );
1975	process_txt_display( txt_id );
1976	#endif
1977
1978	}
1979	} // end process_txt_transfer_ownership()
1980
1981
1982	//////////////////////////////////////////////////
1983	uint32_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	////////////////////////////////////////////////
2010	xptr_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	///////////////////////////////////////////
2021	void 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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