1 /*
2 * Server-side thread management
3 *
4 * Copyright (C) 1998 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <assert.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <signal.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <sys/types.h>
33 #include <unistd.h>
34 #include <time.h>
35 #ifdef HAVE_POLL_H
36 #include <poll.h>
37 #endif
38
39 #include "ntstatus.h"
40 #define WIN32_NO_STATUS
41 #include "windef.h"
42 #include "winternl.h"
43
44 #include "file.h"
45 #include "handle.h"
46 #include "process.h"
47 #include "thread.h"
48 #include "request.h"
49 #include "user.h"
50 #include "security.h"
51
52
53 /* thread queues */
54
55 struct thread_wait
56 {
57 struct thread_wait *next; /* next wait structure for this thread */
58 struct thread *thread; /* owner thread */
59 int count; /* count of objects */
60 int flags;
61 client_ptr_t cookie; /* magic cookie to return to client */
62 timeout_t timeout;
63 struct timeout_user *user;
64 struct wait_queue_entry queues[1];
65 };
66
67 /* asynchronous procedure calls */
68
69 struct thread_apc
70 {
71 struct object obj; /* object header */
72 struct list entry; /* queue linked list */
73 struct thread *caller; /* thread that queued this apc */
74 struct object *owner; /* object that queued this apc */
75 int executed; /* has it been executed by the client? */
76 apc_call_t call; /* call arguments */
77 apc_result_t result; /* call results once executed */
78 };
79
80 static void dump_thread_apc( struct object *obj, int verbose );
81 static int thread_apc_signaled( struct object *obj, struct thread *thread );
82 static void thread_apc_destroy( struct object *obj );
83 static void clear_apc_queue( struct list *queue );
84
85 static const struct object_ops thread_apc_ops =
86 {
87 sizeof(struct thread_apc), /* size */
88 dump_thread_apc, /* dump */
89 no_get_type, /* get_type */
90 add_queue, /* add_queue */
91 remove_queue, /* remove_queue */
92 thread_apc_signaled, /* signaled */
93 no_satisfied, /* satisfied */
94 no_signal, /* signal */
95 no_get_fd, /* get_fd */
96 no_map_access, /* map_access */
97 default_get_sd, /* get_sd */
98 default_set_sd, /* set_sd */
99 no_lookup_name, /* lookup_name */
100 no_open_file, /* open_file */
101 no_close_handle, /* close_handle */
102 thread_apc_destroy /* destroy */
103 };
104
105
106 /* thread operations */
107
108 static void dump_thread( struct object *obj, int verbose );
109 static int thread_signaled( struct object *obj, struct thread *thread );
110 static unsigned int thread_map_access( struct object *obj, unsigned int access );
111 static void thread_poll_event( struct fd *fd, int event );
112 static void destroy_thread( struct object *obj );
113
114 static const struct object_ops thread_ops =
115 {
116 sizeof(struct thread), /* size */
117 dump_thread, /* dump */
118 no_get_type, /* get_type */
119 add_queue, /* add_queue */
120 remove_queue, /* remove_queue */
121 thread_signaled, /* signaled */
122 no_satisfied, /* satisfied */
123 no_signal, /* signal */
124 no_get_fd, /* get_fd */
125 thread_map_access, /* map_access */
126 default_get_sd, /* get_sd */
127 default_set_sd, /* set_sd */
128 no_lookup_name, /* lookup_name */
129 no_open_file, /* open_file */
130 no_close_handle, /* close_handle */
131 destroy_thread /* destroy */
132 };
133
134 static const struct fd_ops thread_fd_ops =
135 {
136 NULL, /* get_poll_events */
137 thread_poll_event, /* poll_event */
138 NULL, /* flush */
139 NULL, /* get_fd_type */
140 NULL, /* ioctl */
141 NULL, /* queue_async */
142 NULL, /* reselect_async */
143 NULL /* cancel_async */
144 };
145
146 static struct list thread_list = LIST_INIT(thread_list);
147
148 /* initialize the structure for a newly allocated thread */
149 static inline void init_thread_structure( struct thread *thread )
150 {
151 int i;
152
153 thread->unix_pid = -1; /* not known yet */
154 thread->unix_tid = -1; /* not known yet */
155 thread->context = NULL;
156 thread->suspend_context = NULL;
157 thread->teb = 0;
158 thread->debug_ctx = NULL;
159 thread->debug_event = NULL;
160 thread->debug_break = 0;
161 thread->queue = NULL;
162 thread->wait = NULL;
163 thread->error = 0;
164 thread->req_data = NULL;
165 thread->req_toread = 0;
166 thread->reply_data = NULL;
167 thread->reply_towrite = 0;
168 thread->request_fd = NULL;
169 thread->reply_fd = NULL;
170 thread->wait_fd = NULL;
171 thread->state = RUNNING;
172 thread->exit_code = 0;
173 thread->priority = 0;
174 thread->affinity = ~0;
175 thread->suspend = 0;
176 thread->desktop_users = 0;
177 thread->token = NULL;
178
179 thread->creation_time = current_time;
180 thread->exit_time = 0;
181
182 list_init( &thread->mutex_list );
183 list_init( &thread->system_apc );
184 list_init( &thread->user_apc );
185
186 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
187 thread->inflight[i].server = thread->inflight[i].client = -1;
188 }
189
190 /* check if address looks valid for a client-side data structure (TEB etc.) */
191 static inline int is_valid_address( client_ptr_t addr )
192 {
193 return addr && !(addr % sizeof(int));
194 }
195
196 /* create a new thread */
197 struct thread *create_thread( int fd, struct process *process )
198 {
199 struct thread *thread;
200
201 if (!(thread = alloc_object( &thread_ops ))) return NULL;
202
203 init_thread_structure( thread );
204
205 thread->process = (struct process *)grab_object( process );
206 thread->desktop = process->desktop;
207 if (!current) current = thread;
208
209 list_add_head( &thread_list, &thread->entry );
210
211 if (!(thread->id = alloc_ptid( thread )))
212 {
213 release_object( thread );
214 return NULL;
215 }
216 if (!(thread->request_fd = create_anonymous_fd( &thread_fd_ops, fd, &thread->obj, 0 )))
217 {
218 release_object( thread );
219 return NULL;
220 }
221
222 set_fd_events( thread->request_fd, POLLIN ); /* start listening to events */
223 add_process_thread( thread->process, thread );
224 return thread;
225 }
226
227 /* handle a client event */
228 static void thread_poll_event( struct fd *fd, int event )
229 {
230 struct thread *thread = get_fd_user( fd );
231 assert( thread->obj.ops == &thread_ops );
232
233 if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
234 else if (event & POLLIN) read_request( thread );
235 else if (event & POLLOUT) write_reply( thread );
236 }
237
238 /* cleanup everything that is no longer needed by a dead thread */
239 /* used by destroy_thread and kill_thread */
240 static void cleanup_thread( struct thread *thread )
241 {
242 int i;
243
244 clear_apc_queue( &thread->system_apc );
245 clear_apc_queue( &thread->user_apc );
246 free( thread->req_data );
247 free( thread->reply_data );
248 if (thread->request_fd) release_object( thread->request_fd );
249 if (thread->reply_fd) release_object( thread->reply_fd );
250 if (thread->wait_fd) release_object( thread->wait_fd );
251 free( thread->suspend_context );
252 free_msg_queue( thread );
253 cleanup_clipboard_thread(thread);
254 destroy_thread_windows( thread );
255 close_thread_desktop( thread );
256 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
257 {
258 if (thread->inflight[i].client != -1)
259 {
260 close( thread->inflight[i].server );
261 thread->inflight[i].client = thread->inflight[i].server = -1;
262 }
263 }
264 thread->req_data = NULL;
265 thread->reply_data = NULL;
266 thread->request_fd = NULL;
267 thread->reply_fd = NULL;
268 thread->wait_fd = NULL;
269 thread->context = NULL;
270 thread->suspend_context = NULL;
271 thread->desktop = 0;
272 }
273
274 /* destroy a thread when its refcount is 0 */
275 static void destroy_thread( struct object *obj )
276 {
277 struct thread *thread = (struct thread *)obj;
278 assert( obj->ops == &thread_ops );
279
280 assert( !thread->debug_ctx ); /* cannot still be debugging something */
281 list_remove( &thread->entry );
282 cleanup_thread( thread );
283 release_object( thread->process );
284 if (thread->id) free_ptid( thread->id );
285 if (thread->token) release_object( thread->token );
286 }
287
288 /* dump a thread on stdout for debugging purposes */
289 static void dump_thread( struct object *obj, int verbose )
290 {
291 struct thread *thread = (struct thread *)obj;
292 assert( obj->ops == &thread_ops );
293
294 fprintf( stderr, "Thread id=%04x unix pid=%d unix tid=%d state=%d\n",
295 thread->id, thread->unix_pid, thread->unix_tid, thread->state );
296 }
297
298 static int thread_signaled( struct object *obj, struct thread *thread )
299 {
300 struct thread *mythread = (struct thread *)obj;
301 return (mythread->state == TERMINATED);
302 }
303
304 static unsigned int thread_map_access( struct object *obj, unsigned int access )
305 {
306 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SYNCHRONIZE;
307 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SYNCHRONIZE;
308 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
309 if (access & GENERIC_ALL) access |= THREAD_ALL_ACCESS;
310 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
311 }
312
313 static void dump_thread_apc( struct object *obj, int verbose )
314 {
315 struct thread_apc *apc = (struct thread_apc *)obj;
316 assert( obj->ops == &thread_apc_ops );
317
318 fprintf( stderr, "APC owner=%p type=%u\n", apc->owner, apc->call.type );
319 }
320
321 static int thread_apc_signaled( struct object *obj, struct thread *thread )
322 {
323 struct thread_apc *apc = (struct thread_apc *)obj;
324 return apc->executed;
325 }
326
327 static void thread_apc_destroy( struct object *obj )
328 {
329 struct thread_apc *apc = (struct thread_apc *)obj;
330 if (apc->caller) release_object( apc->caller );
331 if (apc->owner) release_object( apc->owner );
332 }
333
334 /* queue an async procedure call */
335 static struct thread_apc *create_apc( struct object *owner, const apc_call_t *call_data )
336 {
337 struct thread_apc *apc;
338
339 if ((apc = alloc_object( &thread_apc_ops )))
340 {
341 apc->call = *call_data;
342 apc->caller = NULL;
343 apc->owner = owner;
344 apc->executed = 0;
345 apc->result.type = APC_NONE;
346 if (owner) grab_object( owner );
347 }
348 return apc;
349 }
350
351 /* get a thread pointer from a thread id (and increment the refcount) */
352 struct thread *get_thread_from_id( thread_id_t id )
353 {
354 struct object *obj = get_ptid_entry( id );
355
356 if (obj && obj->ops == &thread_ops) return (struct thread *)grab_object( obj );
357 set_error( STATUS_INVALID_CID );
358 return NULL;
359 }
360
361 /* get a thread from a handle (and increment the refcount) */
362 struct thread *get_thread_from_handle( obj_handle_t handle, unsigned int access )
363 {
364 return (struct thread *)get_handle_obj( current->process, handle,
365 access, &thread_ops );
366 }
367
368 /* find a thread from a Unix tid */
369 struct thread *get_thread_from_tid( int tid )
370 {
371 struct thread *thread;
372
373 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
374 {
375 if (thread->unix_tid == tid) return thread;
376 }
377 return NULL;
378 }
379
380 /* find a thread from a Unix pid */
381 struct thread *get_thread_from_pid( int pid )
382 {
383 struct thread *thread;
384
385 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
386 {
387 if (thread->unix_pid == pid) return thread;
388 }
389 return NULL;
390 }
391
392 #define THREAD_PRIORITY_REALTIME_HIGHEST 6
393 #define THREAD_PRIORITY_REALTIME_LOWEST -7
394
395 /* set all information about a thread */
396 static void set_thread_info( struct thread *thread,
397 const struct set_thread_info_request *req )
398 {
399 if (req->mask & SET_THREAD_INFO_PRIORITY)
400 {
401 int max = THREAD_PRIORITY_HIGHEST;
402 int min = THREAD_PRIORITY_LOWEST;
403 if (thread->process->priority == PROCESS_PRIOCLASS_REALTIME)
404 {
405 max = THREAD_PRIORITY_REALTIME_HIGHEST;
406 min = THREAD_PRIORITY_REALTIME_LOWEST;
407 }
408 if ((req->priority >= min && req->priority <= max) ||
409 req->priority == THREAD_PRIORITY_IDLE ||
410 req->priority == THREAD_PRIORITY_TIME_CRITICAL)
411 thread->priority = req->priority;
412 else
413 set_error( STATUS_INVALID_PARAMETER );
414 }
415 if (req->mask & SET_THREAD_INFO_AFFINITY)
416 thread->affinity = req->affinity;
417 if (req->mask & SET_THREAD_INFO_TOKEN)
418 security_set_thread_token( thread, req->token );
419 }
420
421 /* stop a thread (at the Unix level) */
422 void stop_thread( struct thread *thread )
423 {
424 if (thread->context) return; /* already inside a debug event, no need for a signal */
425 /* can't stop a thread while initialisation is in progress */
426 if (is_process_init_done(thread->process)) send_thread_signal( thread, SIGUSR1 );
427 }
428
429 /* suspend a thread */
430 static int suspend_thread( struct thread *thread )
431 {
432 int old_count = thread->suspend;
433 if (thread->suspend < MAXIMUM_SUSPEND_COUNT)
434 {
435 if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
436 }
437 else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
438 return old_count;
439 }
440
441 /* resume a thread */
442 static int resume_thread( struct thread *thread )
443 {
444 int old_count = thread->suspend;
445 if (thread->suspend > 0)
446 {
447 if (!(--thread->suspend + thread->process->suspend)) wake_thread( thread );
448 }
449 return old_count;
450 }
451
452 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
453 int add_queue( struct object *obj, struct wait_queue_entry *entry )
454 {
455 grab_object( obj );
456 entry->obj = obj;
457 list_add_tail( &obj->wait_queue, &entry->entry );
458 return 1;
459 }
460
461 /* remove a thread from an object wait queue */
462 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
463 {
464 list_remove( &entry->entry );
465 release_object( obj );
466 }
467
468 /* finish waiting */
469 static void end_wait( struct thread *thread )
470 {
471 struct thread_wait *wait = thread->wait;
472 struct wait_queue_entry *entry;
473 int i;
474
475 assert( wait );
476 thread->wait = wait->next;
477 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
478 entry->obj->ops->remove_queue( entry->obj, entry );
479 if (wait->user) remove_timeout_user( wait->user );
480 free( wait );
481 }
482
483 /* build the thread wait structure */
484 static int wait_on( unsigned int count, struct object *objects[], int flags, timeout_t timeout )
485 {
486 struct thread_wait *wait;
487 struct wait_queue_entry *entry;
488 unsigned int i;
489
490 if (!(wait = mem_alloc( FIELD_OFFSET(struct thread_wait, queues[count]) ))) return 0;
491 wait->next = current->wait;
492 wait->thread = current;
493 wait->count = count;
494 wait->flags = flags;
495 wait->user = NULL;
496 wait->timeout = timeout;
497 current->wait = wait;
498
499 for (i = 0, entry = wait->queues; i < count; i++, entry++)
500 {
501 struct object *obj = objects[i];
502 entry->thread = current;
503 if (!obj->ops->add_queue( obj, entry ))
504 {
505 wait->count = i;
506 end_wait( current );
507 return 0;
508 }
509 }
510 return 1;
511 }
512
513 /* check if the thread waiting condition is satisfied */
514 static int check_wait( struct thread *thread )
515 {
516 int i, signaled;
517 struct thread_wait *wait = thread->wait;
518 struct wait_queue_entry *entry = wait->queues;
519
520 assert( wait );
521
522 if ((wait->flags & SELECT_INTERRUPTIBLE) && !list_empty( &thread->system_apc ))
523 return STATUS_USER_APC;
524
525 /* Suspended threads may not acquire locks, but they can run system APCs */
526 if (thread->process->suspend + thread->suspend > 0) return -1;
527
528 if (wait->flags & SELECT_ALL)
529 {
530 int not_ok = 0;
531 /* Note: we must check them all anyway, as some objects may
532 * want to do something when signaled, even if others are not */
533 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
534 not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
535 if (not_ok) goto other_checks;
536 /* Wait satisfied: tell it to all objects */
537 signaled = 0;
538 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
539 if (entry->obj->ops->satisfied( entry->obj, thread ))
540 signaled = STATUS_ABANDONED_WAIT_0;
541 return signaled;
542 }
543 else
544 {
545 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
546 {
547 if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
548 /* Wait satisfied: tell it to the object */
549 signaled = i;
550 if (entry->obj->ops->satisfied( entry->obj, thread ))
551 signaled = i + STATUS_ABANDONED_WAIT_0;
552 return signaled;
553 }
554 }
555
556 other_checks:
557 if ((wait->flags & SELECT_ALERTABLE) && !list_empty(&thread->user_apc)) return STATUS_USER_APC;
558 if (wait->timeout <= current_time) return STATUS_TIMEOUT;
559 return -1;
560 }
561
562 /* send the wakeup signal to a thread */
563 static int send_thread_wakeup( struct thread *thread, client_ptr_t cookie, int signaled )
564 {
565 struct wake_up_reply reply;
566 int ret;
567
568 memset( &reply, 0, sizeof(reply) );
569 reply.cookie = cookie;
570 reply.signaled = signaled;
571 if ((ret = write( get_unix_fd( thread->wait_fd ), &reply, sizeof(reply) )) == sizeof(reply))
572 return 0;
573 if (ret >= 0)
574 fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
575 else if (errno == EPIPE)
576 kill_thread( thread, 0 ); /* normal death */
577 else
578 fatal_protocol_perror( thread, "write" );
579 return -1;
580 }
581
582 /* attempt to wake up a thread */
583 /* return >0 if OK, 0 if the wait condition is still not satisfied */
584 int wake_thread( struct thread *thread )
585 {
586 int signaled, count;
587 client_ptr_t cookie;
588
589 for (count = 0; thread->wait; count++)
590 {
591 if ((signaled = check_wait( thread )) == -1) break;
592
593 cookie = thread->wait->cookie;
594 if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d\n", thread->id, signaled );
595 end_wait( thread );
596 if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
597 break;
598 }
599 return count;
600 }
601
602 /* thread wait timeout */
603 static void thread_timeout( void *ptr )
604 {
605 struct thread_wait *wait = ptr;
606 struct thread *thread = wait->thread;
607 client_ptr_t cookie = wait->cookie;
608
609 wait->user = NULL;
610 if (thread->wait != wait) return; /* not the top-level wait, ignore it */
611 if (thread->suspend + thread->process->suspend > 0) return; /* suspended, ignore it */
612
613 if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=TIMEOUT\n", thread->id );
614 end_wait( thread );
615 if (send_thread_wakeup( thread, cookie, STATUS_TIMEOUT ) == -1) return;
616 /* check if other objects have become signaled in the meantime */
617 wake_thread( thread );
618 }
619
620 /* try signaling an event flag, a semaphore or a mutex */
621 static int signal_object( obj_handle_t handle )
622 {
623 struct object *obj;
624 int ret = 0;
625
626 obj = get_handle_obj( current->process, handle, 0, NULL );
627 if (obj)
628 {
629 ret = obj->ops->signal( obj, get_handle_access( current->process, handle ));
630 release_object( obj );
631 }
632 return ret;
633 }
634
635 /* select on a list of handles */
636 static timeout_t select_on( unsigned int count, client_ptr_t cookie, const obj_handle_t *handles,
637 int flags, timeout_t timeout, obj_handle_t signal_obj )
638 {
639 int ret;
640 unsigned int i;
641 struct object *objects[MAXIMUM_WAIT_OBJECTS];
642
643 if (timeout <= 0) timeout = current_time - timeout;
644
645 if (count > MAXIMUM_WAIT_OBJECTS)
646 {
647 set_error( STATUS_INVALID_PARAMETER );
648 return 0;
649 }
650 for (i = 0; i < count; i++)
651 {
652 if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
653 break;
654 }
655
656 if (i < count) goto done;
657 if (!wait_on( count, objects, flags, timeout )) goto done;
658
659 /* signal the object */
660 if (signal_obj)
661 {
662 if (!signal_object( signal_obj ))
663 {
664 end_wait( current );
665 goto done;
666 }
667 /* check if we woke ourselves up */
668 if (!current->wait) goto done;
669 }
670
671 if ((ret = check_wait( current )) != -1)
672 {
673 /* condition is already satisfied */
674 end_wait( current );
675 set_error( ret );
676 goto done;
677 }
678
679 /* now we need to wait */
680 if (current->wait->timeout != TIMEOUT_INFINITE)
681 {
682 if (!(current->wait->user = add_timeout_user( current->wait->timeout,
683 thread_timeout, current->wait )))
684 {
685 end_wait( current );
686 goto done;
687 }
688 }
689 current->wait->cookie = cookie;
690 set_error( STATUS_PENDING );
691
692 done:
693 while (i > 0) release_object( objects[--i] );
694 return timeout;
695 }
696
697 /* attempt to wake threads sleeping on the object wait queue */
698 void wake_up( struct object *obj, int max )
699 {
700 struct list *ptr, *next;
701
702 LIST_FOR_EACH_SAFE( ptr, next, &obj->wait_queue )
703 {
704 struct wait_queue_entry *entry = LIST_ENTRY( ptr, struct wait_queue_entry, entry );
705 if (wake_thread( entry->thread ))
706 {
707 if (max && !--max) break;
708 }
709 }
710 }
711
712 /* return the apc queue to use for a given apc type */
713 static inline struct list *get_apc_queue( struct thread *thread, enum apc_type type )
714 {
715 switch(type)
716 {
717 case APC_NONE:
718 case APC_USER:
719 case APC_TIMER:
720 return &thread->user_apc;
721 default:
722 return &thread->system_apc;
723 }
724 }
725
726 /* check if thread is currently waiting for a (system) apc */
727 static inline int is_in_apc_wait( struct thread *thread )
728 {
729 return (thread->process->suspend || thread->suspend ||
730 (thread->wait && (thread->wait->flags & SELECT_INTERRUPTIBLE)));
731 }
732
733 /* queue an existing APC to a given thread */
734 static int queue_apc( struct process *process, struct thread *thread, struct thread_apc *apc )
735 {
736 struct list *queue;
737
738 if (!thread) /* find a suitable thread inside the process */
739 {
740 struct thread *candidate;
741
742 /* first try to find a waiting thread */
743 LIST_FOR_EACH_ENTRY( candidate, &process->thread_list, struct thread, proc_entry )
744 {
745 if (candidate->state == TERMINATED) continue;
746 if (is_in_apc_wait( candidate ))
747 {
748 thread = candidate;
749 break;
750 }
751 }
752 if (!thread)
753 {
754 /* then use the first one that accepts a signal */
755 LIST_FOR_EACH_ENTRY( candidate, &process->thread_list, struct thread, proc_entry )
756 {
757 if (send_thread_signal( candidate, SIGUSR1 ))
758 {
759 thread = candidate;
760 break;
761 }
762 }
763 }
764 if (!thread) return 0; /* nothing found */
765 queue = get_apc_queue( thread, apc->call.type );
766 }
767 else
768 {
769 if (thread->state == TERMINATED) return 0;
770 queue = get_apc_queue( thread, apc->call.type );
771 /* send signal for system APCs if needed */
772 if (queue == &thread->system_apc && list_empty( queue ) && !is_in_apc_wait( thread ))
773 {
774 if (!send_thread_signal( thread, SIGUSR1 )) return 0;
775 }
776 /* cancel a possible previous APC with the same owner */
777 if (apc->owner) thread_cancel_apc( thread, apc->owner, apc->call.type );
778 }
779
780 grab_object( apc );
781 list_add_tail( queue, &apc->entry );
782 if (!list_prev( queue, &apc->entry )) /* first one */
783 wake_thread( thread );
784
785 return 1;
786 }
787
788 /* queue an async procedure call */
789 int thread_queue_apc( struct thread *thread, struct object *owner, const apc_call_t *call_data )
790 {
791 struct thread_apc *apc;
792 int ret = 0;
793
794 if ((apc = create_apc( owner, call_data )))
795 {
796 ret = queue_apc( NULL, thread, apc );
797 release_object( apc );
798 }
799 return ret;
800 }
801
802 /* cancel the async procedure call owned by a specific object */
803 void thread_cancel_apc( struct thread *thread, struct object *owner, enum apc_type type )
804 {
805 struct thread_apc *apc;
806 struct list *queue = get_apc_queue( thread, type );
807
808 LIST_FOR_EACH_ENTRY( apc, queue, struct thread_apc, entry )
809 {
810 if (apc->owner != owner) continue;
811 list_remove( &apc->entry );
812 apc->executed = 1;
813 wake_up( &apc->obj, 0 );
814 release_object( apc );
815 return;
816 }
817 }
818
819 /* remove the head apc from the queue; the returned object must be released by the caller */
820 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
821 {
822 struct thread_apc *apc = NULL;
823 struct list *ptr = list_head( &thread->system_apc );
824
825 if (!ptr && !system_only) ptr = list_head( &thread->user_apc );
826 if (ptr)
827 {
828 apc = LIST_ENTRY( ptr, struct thread_apc, entry );
829 list_remove( ptr );
830 }
831 return apc;
832 }
833
834 /* clear an APC queue, cancelling all the APCs on it */
835 static void clear_apc_queue( struct list *queue )
836 {
837 struct list *ptr;
838
839 while ((ptr = list_head( queue )))
840 {
841 struct thread_apc *apc = LIST_ENTRY( ptr, struct thread_apc, entry );
842 list_remove( &apc->entry );
843 apc->executed = 1;
844 wake_up( &apc->obj, 0 );
845 release_object( apc );
846 }
847 }
848
849 /* add an fd to the inflight list */
850 /* return list index, or -1 on error */
851 int thread_add_inflight_fd( struct thread *thread, int client, int server )
852 {
853 int i;
854
855 if (server == -1) return -1;
856 if (client == -1)
857 {
858 close( server );
859 return -1;
860 }
861
862 /* first check if we already have an entry for this fd */
863 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
864 if (thread->inflight[i].client == client)
865 {
866 close( thread->inflight[i].server );
867 thread->inflight[i].server = server;
868 return i;
869 }
870
871 /* now find a free spot to store it */
872 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
873 if (thread->inflight[i].client == -1)
874 {
875 thread->inflight[i].client = client;
876 thread->inflight[i].server = server;
877 return i;
878 }
879 return -1;
880 }
881
882 /* get an inflight fd and purge it from the list */
883 /* the fd must be closed when no longer used */
884 int thread_get_inflight_fd( struct thread *thread, int client )
885 {
886 int i, ret;
887
888 if (client == -1) return -1;
889
890 do
891 {
892 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
893 {
894 if (thread->inflight[i].client == client)
895 {
896 ret = thread->inflight[i].server;
897 thread->inflight[i].server = thread->inflight[i].client = -1;
898 return ret;
899 }
900 }
901 } while (!receive_fd( thread->process )); /* in case it is still in the socket buffer */
902 return -1;
903 }
904
905 /* kill a thread on the spot */
906 void kill_thread( struct thread *thread, int violent_death )
907 {
908 if (thread->state == TERMINATED) return; /* already killed */
909 thread->state = TERMINATED;
910 thread->exit_time = current_time;
911 if (current == thread) current = NULL;
912 if (debug_level)
913 fprintf( stderr,"%04x: *killed* exit_code=%d\n",
914 thread->id, thread->exit_code );
915 if (thread->wait)
916 {
917 while (thread->wait) end_wait( thread );
918 send_thread_wakeup( thread, 0, STATUS_PENDING );
919 /* if it is waiting on the socket, we don't need to send a SIGQUIT */
920 violent_death = 0;
921 }
922 kill_console_processes( thread, 0 );
923 debug_exit_thread( thread );
924 abandon_mutexes( thread );
925 wake_up( &thread->obj, 0 );
926 if (violent_death) send_thread_signal( thread, SIGQUIT );
927 cleanup_thread( thread );
928 remove_process_thread( thread->process, thread );
929 release_object( thread );
930 }
931
932 /* trigger a breakpoint event in a given thread */
933 void break_thread( struct thread *thread )
934 {
935 struct debug_event_exception data;
936
937 assert( thread->context );
938
939 data.record.ExceptionCode = STATUS_BREAKPOINT;
940 data.record.ExceptionFlags = EXCEPTION_CONTINUABLE;
941 data.record.ExceptionRecord = NULL;
942 data.record.ExceptionAddress = get_context_ip( thread->context );
943 data.record.NumberParameters = 0;
944 data.first = 1;
945 generate_debug_event( thread, EXCEPTION_DEBUG_EVENT, &data );
946 thread->debug_break = 0;
947 }
948
949 /* take a snapshot of currently running threads */
950 struct thread_snapshot *thread_snap( int *count )
951 {
952 struct thread_snapshot *snapshot, *ptr;
953 struct thread *thread;
954 int total = 0;
955
956 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
957 if (thread->state != TERMINATED) total++;
958 if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
959 ptr = snapshot;
960 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
961 {
962 if (thread->state == TERMINATED) continue;
963 ptr->thread = thread;
964 ptr->count = thread->obj.refcount;
965 ptr->priority = thread->priority;
966 grab_object( thread );
967 ptr++;
968 }
969 *count = total;
970 return snapshot;
971 }
972
973 /* gets the current impersonation token */
974 struct token *thread_get_impersonation_token( struct thread *thread )
975 {
976 if (thread->token)
977 return thread->token;
978 else
979 return thread->process->token;
980 }
981
982 /* create a new thread */
983 DECL_HANDLER(new_thread)
984 {
985 struct thread *thread;
986 int request_fd = thread_get_inflight_fd( current, req->request_fd );
987
988 if (request_fd == -1 || fcntl( request_fd, F_SETFL, O_NONBLOCK ) == -1)
989 {
990 if (request_fd != -1) close( request_fd );
991 set_error( STATUS_INVALID_HANDLE );
992 return;
993 }
994
995 if ((thread = create_thread( request_fd, current->process )))
996 {
997 if (req->suspend) thread->suspend++;
998 reply->tid = get_thread_id( thread );
999 if ((reply->handle = alloc_handle( current->process, thread, req->access, req->attributes )))
1000 {
1001 /* thread object will be released when the thread gets killed */
1002 return;
1003 }
1004 kill_thread( thread, 1 );
1005 }
1006 }
1007
1008 /* initialize a new thread */
1009 DECL_HANDLER(init_thread)
1010 {
1011 struct process *process = current->process;
1012 int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
1013 int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
1014
1015 if (current->reply_fd) /* already initialised */
1016 {
1017 set_error( STATUS_INVALID_PARAMETER );
1018 goto error;
1019 }
1020
1021 if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1) goto error;
1022
1023 current->reply_fd = create_anonymous_fd( &thread_fd_ops, reply_fd, ¤t->obj, 0 );
1024 reply_fd = -1;
1025 if (!current->reply_fd) goto error;
1026
1027 if (wait_fd == -1)
1028 {
1029 set_error( STATUS_TOO_MANY_OPENED_FILES ); /* most likely reason */
1030 return;
1031 }
1032 if (!(current->wait_fd = create_anonymous_fd( &thread_fd_ops, wait_fd, ¤t->obj, 0 )))
1033 return;
1034
1035 if (!is_valid_address(req->teb) || !is_valid_address(req->peb))
1036 {
1037 set_error( STATUS_INVALID_PARAMETER );
1038 return;
1039 }
1040
1041 current->unix_pid = req->unix_pid;
1042 current->unix_tid = req->unix_tid;
1043 current->teb = req->teb;
1044
1045 if (!process->peb) /* first thread, initialize the process too */
1046 {
1047 process->unix_pid = current->unix_pid;
1048 process->peb = req->peb;
1049 reply->info_size = init_process( current );
1050 }
1051 else
1052 {
1053 if (process->unix_pid != current->unix_pid)
1054 process->unix_pid = -1; /* can happen with linuxthreads */
1055 if (current->suspend + process->suspend > 0) stop_thread( current );
1056 generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, &req->entry );
1057 }
1058 debug_level = max( debug_level, req->debug_level );
1059
1060 reply->pid = get_process_id( process );
1061 reply->tid = get_thread_id( current );
1062 reply->version = SERVER_PROTOCOL_VERSION;
1063 reply->server_start = server_start_time;
1064 return;
1065
1066 error:
1067 if (reply_fd != -1) close( reply_fd );
1068 if (wait_fd != -1) close( wait_fd );
1069 }
1070
1071 /* terminate a thread */
1072 DECL_HANDLER(terminate_thread)
1073 {
1074 struct thread *thread;
1075
1076 reply->self = 0;
1077 reply->last = 0;
1078 if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
1079 {
1080 thread->exit_code = req->exit_code;
1081 if (thread != current) kill_thread( thread, 1 );
1082 else
1083 {
1084 reply->self = 1;
1085 reply->last = (thread->process->running_threads == 1);
1086 }
1087 release_object( thread );
1088 }
1089 }
1090
1091 /* open a handle to a thread */
1092 DECL_HANDLER(open_thread)
1093 {
1094 struct thread *thread = get_thread_from_id( req->tid );
1095
1096 reply->handle = 0;
1097 if (thread)
1098 {
1099 reply->handle = alloc_handle( current->process, thread, req->access, req->attributes );
1100 release_object( thread );
1101 }
1102 }
1103
1104 /* fetch information about a thread */
1105 DECL_HANDLER(get_thread_info)
1106 {
1107 struct thread *thread;
1108 obj_handle_t handle = req->handle;
1109
1110 if (!handle) thread = get_thread_from_id( req->tid_in );
1111 else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
1112
1113 if (thread)
1114 {
1115 reply->pid = get_process_id( thread->process );
1116 reply->tid = get_thread_id( thread );
1117 reply->teb = thread->teb;
1118 reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STATUS_PENDING;
1119 reply->priority = thread->priority;
1120 reply->affinity = thread->affinity;
1121 reply->creation_time = thread->creation_time;
1122 reply->exit_time = thread->exit_time;
1123 reply->last = thread->process->running_threads == 1;
1124
1125 release_object( thread );
1126 }
1127 }
1128
1129 /* set information about a thread */
1130 DECL_HANDLER(set_thread_info)
1131 {
1132 struct thread *thread;
1133
1134 if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
1135 {
1136 set_thread_info( thread, req );
1137 release_object( thread );
1138 }
1139 }
1140
1141 /* suspend a thread */
1142 DECL_HANDLER(suspend_thread)
1143 {
1144 struct thread *thread;
1145
1146 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
1147 {
1148 if (thread->state == TERMINATED) set_error( STATUS_ACCESS_DENIED );
1149 else reply->count = suspend_thread( thread );
1150 release_object( thread );
1151 }
1152 }
1153
1154 /* resume a thread */
1155 DECL_HANDLER(resume_thread)
1156 {
1157 struct thread *thread;
1158
1159 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
1160 {
1161 reply->count = resume_thread( thread );
1162 release_object( thread );
1163 }
1164 }
1165
1166 /* select on a handle list */
1167 DECL_HANDLER(select)
1168 {
1169 struct thread_apc *apc;
1170 unsigned int count;
1171 const apc_result_t *result = get_req_data();
1172 const obj_handle_t *handles = (const obj_handle_t *)(result + 1);
1173
1174 if (get_req_data_size() < sizeof(*result))
1175 {
1176 set_error( STATUS_INVALID_PARAMETER );
1177 return;
1178 }
1179 count = (get_req_data_size() - sizeof(*result)) / sizeof(obj_handle_t);
1180
1181 /* first store results of previous apc */
1182 if (req->prev_apc)
1183 {
1184 if (!(apc = (struct thread_apc *)get_handle_obj( current->process, req->prev_apc,
1185 0, &thread_apc_ops ))) return;
1186 apc->result = *result;
1187 apc->executed = 1;
1188 if (apc->result.type == APC_CREATE_THREAD) /* transfer the handle to the caller process */
1189 {
1190 obj_handle_t handle = duplicate_handle( current->process, apc->result.create_thread.handle,
1191 apc->caller->process, 0, 0, DUP_HANDLE_SAME_ACCESS );
1192 close_handle( current->process, apc->result.create_thread.handle );
1193 apc->result.create_thread.handle = handle;
1194 clear_error(); /* ignore errors from the above calls */
1195 }
1196 else if (apc->result.type == APC_ASYNC_IO)
1197 {
1198 if (apc->owner)
1199 async_set_result( apc->owner, apc->result.async_io.status,
1200 apc->result.async_io.total, apc->result.async_io.apc );
1201 }
1202 wake_up( &apc->obj, 0 );
1203 close_handle( current->process, req->prev_apc );
1204 release_object( apc );
1205 }
1206
1207 reply->timeout = select_on( count, req->cookie, handles, req->flags, req->timeout, req->signal );
1208
1209 if (get_error() == STATUS_USER_APC)
1210 {
1211 for (;;)
1212 {
1213 if (!(apc = thread_dequeue_apc( current, !(req->flags & SELECT_ALERTABLE) )))
1214 break;
1215 /* Optimization: ignore APC_NONE calls, they are only used to
1216 * wake up a thread, but since we got here the thread woke up already.
1217 */
1218 if (apc->call.type != APC_NONE)
1219 {
1220 if ((reply->apc_handle = alloc_handle( current->process, apc, SYNCHRONIZE, 0 )))
1221 reply->call = apc->call;
1222 release_object( apc );
1223 break;
1224 }
1225 apc->executed = 1;
1226 wake_up( &apc->obj, 0 );
1227 release_object( apc );
1228 }
1229 }
1230 }
1231
1232 /* queue an APC for a thread or process */
1233 DECL_HANDLER(queue_apc)
1234 {
1235 struct thread *thread = NULL;
1236 struct process *process = NULL;
1237 struct thread_apc *apc;
1238
1239 if (!(apc = create_apc( NULL, &req->call ))) return;
1240
1241 switch (apc->call.type)
1242 {
1243 case APC_NONE:
1244 case APC_USER:
1245 thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT );
1246 break;
1247 case APC_VIRTUAL_ALLOC:
1248 case APC_VIRTUAL_FREE:
1249 case APC_VIRTUAL_PROTECT:
1250 case APC_VIRTUAL_FLUSH:
1251 case APC_VIRTUAL_LOCK:
1252 case APC_VIRTUAL_UNLOCK:
1253 case APC_UNMAP_VIEW:
1254 process = get_process_from_handle( req->handle, PROCESS_VM_OPERATION );
1255 break;
1256 case APC_VIRTUAL_QUERY:
1257 process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION );
1258 break;
1259 case APC_MAP_VIEW:
1260 process = get_process_from_handle( req->handle, PROCESS_VM_OPERATION );
1261 if (process && process != current->process)
1262 {
1263 /* duplicate the handle into the target process */
1264 obj_handle_t handle = duplicate_handle( current->process, apc->call.map_view.handle,
1265 process, 0, 0, DUP_HANDLE_SAME_ACCESS );
1266 if (handle) apc->call.map_view.handle = handle;
1267 else
1268 {
1269 release_object( process );
1270 process = NULL;
1271 }
1272 }
1273 break;
1274 case APC_CREATE_THREAD:
1275 process = get_process_from_handle( req->handle, PROCESS_CREATE_THREAD );
1276 break;
1277 default:
1278 set_error( STATUS_INVALID_PARAMETER );
1279 break;
1280 }
1281
1282 if (thread)
1283 {
1284 if (!queue_apc( NULL, thread, apc )) set_error( STATUS_THREAD_IS_TERMINATING );
1285 release_object( thread );
1286 }
1287 else if (process)
1288 {
1289 reply->self = (process == current->process);
1290 if (!reply->self)
1291 {
1292 obj_handle_t handle = alloc_handle( current->process, apc, SYNCHRONIZE, 0 );
1293 if (handle)
1294 {
1295 if (queue_apc( process, NULL, apc ))
1296 {
1297 apc->caller = (struct thread *)grab_object( current );
1298 reply->handle = handle;
1299 }
1300 else
1301 {
1302 close_handle( current->process, handle );
1303 set_error( STATUS_PROCESS_IS_TERMINATING );
1304 }
1305 }
1306 }
1307 release_object( process );
1308 }
1309
1310 release_object( apc );
1311 }
1312
1313 /* Get the result of an APC call */
1314 DECL_HANDLER(get_apc_result)
1315 {
1316 struct thread_apc *apc;
1317
1318 if (!(apc = (struct thread_apc *)get_handle_obj( current->process, req->handle,
1319 0, &thread_apc_ops ))) return;
1320 if (!apc->executed) set_error( STATUS_PENDING );
1321 else
1322 {
1323 reply->result = apc->result;
1324 /* close the handle directly to avoid an extra round-trip */
1325 close_handle( current->process, req->handle );
1326 }
1327 release_object( apc );
1328 }
1329
1330 /* retrieve the current context of a thread */
1331 DECL_HANDLER(get_thread_context)
1332 {
1333 struct thread *thread;
1334 CONTEXT *context;
1335
1336 if (get_reply_max_size() < sizeof(CONTEXT))
1337 {
1338 set_error( STATUS_INVALID_PARAMETER );
1339 return;
1340 }
1341 if (!(thread = get_thread_from_handle( req->handle, THREAD_GET_CONTEXT ))) return;
1342
1343 if (req->suspend)
1344 {
1345 if (thread != current || !thread->suspend_context)
1346 {
1347 /* not suspended, shouldn't happen */
1348 set_error( STATUS_INVALID_PARAMETER );
1349 }
1350 else
1351 {
1352 if (thread->context == thread->suspend_context) thread->context = NULL;
1353 set_reply_data_ptr( thread->suspend_context, sizeof(CONTEXT) );
1354 thread->suspend_context = NULL;
1355 }
1356 }
1357 else if (thread != current && !thread->context)
1358 {
1359 /* thread is not suspended, retry (if it's still running) */
1360 if (thread->state != RUNNING) set_error( STATUS_ACCESS_DENIED );
1361 else set_error( STATUS_PENDING );
1362 }
1363 else if ((context = set_reply_data_size( sizeof(CONTEXT) )))
1364 {
1365 unsigned int flags = get_context_system_regs( req->flags );
1366
1367 memset( context, 0, sizeof(CONTEXT) );
1368 context->ContextFlags = get_context_cpu_flag();
1369 if (thread->context) copy_context( context, thread->context, req->flags & ~flags );
1370 if (flags) get_thread_context( thread, context, flags );
1371 }
1372 reply->self = (thread == current);
1373 release_object( thread );
1374 }
1375
1376 /* set the current context of a thread */
1377 DECL_HANDLER(set_thread_context)
1378 {
1379 struct thread *thread;
1380
1381 if (get_req_data_size() < sizeof(CONTEXT))
1382 {
1383 set_error( STATUS_INVALID_PARAMETER );
1384 return;
1385 }
1386 if (!(thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT ))) return;
1387
1388 if (req->suspend)
1389 {
1390 if (thread != current || thread->context)
1391 {
1392 /* nested suspend or exception, shouldn't happen */
1393 set_error( STATUS_INVALID_PARAMETER );
1394 }
1395 else if ((thread->suspend_context = mem_alloc( sizeof(CONTEXT) )))
1396 {
1397 memcpy( thread->suspend_context, get_req_data(), sizeof(CONTEXT) );
1398 thread->context = thread->suspend_context;
1399 if (thread->debug_break) break_thread( thread );
1400 }
1401 }
1402 else if (thread != current && !thread->context)
1403 {
1404 /* thread is not suspended, retry (if it's still running) */
1405 if (thread->state != RUNNING) set_error( STATUS_ACCESS_DENIED );
1406 else set_error( STATUS_PENDING );
1407 }
1408 else
1409 {
1410 const CONTEXT *context = get_req_data();
1411 unsigned int flags = get_context_system_regs( req->flags );
1412
1413 if (flags) set_thread_context( thread, context, flags );
1414 if (thread->context && !get_error())
1415 copy_context( thread->context, context, req->flags & ~flags );
1416 }
1417 reply->self = (thread == current);
1418 release_object( thread );
1419 }
1420
1421 /* fetch a selector entry for a thread */
1422 DECL_HANDLER(get_selector_entry)
1423 {
1424 struct thread *thread;
1425 if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
1426 {
1427 get_selector_entry( thread, req->entry, &reply->base, &reply->limit, &reply->flags );
1428 release_object( thread );
1429 }
1430 }
1431
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