2 * Server-side thread management
4 * Copyright (C) 1998 Alexandre Julliard
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <sys/types.h>
48 struct thread_wait *next; /* next wait structure for this thread */
49 struct thread *thread; /* owner thread */
50 int count; /* count of objects */
52 void *cookie; /* magic cookie to return to client */
53 struct timeval timeout;
54 struct timeout_user *user;
55 struct wait_queue_entry queues[1];
58 /* asynchronous procedure calls */
62 struct thread_apc *next; /* queue linked list */
63 struct thread_apc *prev;
64 struct object *owner; /* object that queued this apc */
65 void *func; /* function to call in client */
66 enum apc_type type; /* type of apc function */
67 int nb_args; /* number of arguments */
68 void *args[1]; /* function arguments */
72 /* thread operations */
74 static void dump_thread( struct object *obj, int verbose );
75 static int thread_signaled( struct object *obj, struct thread *thread );
76 static void thread_poll_event( struct object *obj, int event );
77 static void destroy_thread( struct object *obj );
78 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only );
80 static const struct object_ops thread_ops =
82 sizeof(struct thread), /* size */
83 dump_thread, /* dump */
84 add_queue, /* add_queue */
85 remove_queue, /* remove_queue */
86 thread_signaled, /* signaled */
87 no_satisfied, /* satisfied */
88 NULL, /* get_poll_events */
89 thread_poll_event, /* poll_event */
90 no_get_fd, /* get_fd */
92 no_get_file_info, /* get_file_info */
93 NULL, /* queue_async */
94 destroy_thread /* destroy */
97 static struct thread *first_thread;
98 static struct thread *booting_thread;
100 /* initialize the structure for a newly allocated thread */
101 inline static void init_thread_structure( struct thread *thread )
105 thread->unix_pid = 0; /* not known yet */
106 thread->context = NULL;
108 thread->mutex = NULL;
109 thread->debug_ctx = NULL;
110 thread->debug_event = NULL;
111 thread->queue = NULL;
114 thread->system_apc.head = NULL;
115 thread->system_apc.tail = NULL;
116 thread->user_apc.head = NULL;
117 thread->user_apc.tail = NULL;
119 thread->req_data = NULL;
120 thread->req_toread = 0;
121 thread->reply_data = NULL;
122 thread->reply_towrite = 0;
123 thread->reply_fd = -1;
124 thread->wait_fd = -1;
125 thread->state = RUNNING;
126 thread->attached = 0;
127 thread->exit_code = 0;
130 thread->priority = THREAD_PRIORITY_NORMAL;
131 thread->affinity = 1;
134 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
135 thread->inflight[i].server = thread->inflight[i].client = -1;
138 /* create a new thread */
139 struct thread *create_thread( int fd, struct process *process )
141 struct thread *thread;
143 if (!(thread = alloc_object( &thread_ops, fd ))) return NULL;
145 init_thread_structure( thread );
147 thread->process = (struct process *)grab_object( process );
148 thread->request_fd = fd;
149 if (!current) current = thread;
151 if (!booting_thread) /* first thread ever */
153 booting_thread = thread;
154 lock_master_socket(1);
157 if ((thread->next = first_thread) != NULL) thread->next->prev = thread;
158 first_thread = thread;
160 set_select_events( &thread->obj, POLLIN ); /* start listening to events */
161 add_process_thread( thread->process, thread );
165 /* handle a client event */
166 static void thread_poll_event( struct object *obj, int event )
168 struct thread *thread = (struct thread *)obj;
169 assert( obj->ops == &thread_ops );
171 if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
172 else if (event & POLLIN) read_request( thread );
173 else if (event & POLLOUT) write_reply( thread );
176 /* cleanup everything that is no longer needed by a dead thread */
177 /* used by destroy_thread and kill_thread */
178 static void cleanup_thread( struct thread *thread )
181 struct thread_apc *apc;
183 while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
184 if (thread->req_data) free( thread->req_data );
185 if (thread->reply_data) free( thread->reply_data );
186 if (thread->request_fd != -1) close( thread->request_fd );
187 if (thread->reply_fd != -1) close( thread->reply_fd );
188 if (thread->wait_fd != -1) close( thread->wait_fd );
191 if (thread->process->queue == thread->queue)
193 release_object( thread->process->queue );
194 thread->process->queue = NULL;
196 release_object( thread->queue );
197 thread->queue = NULL;
199 destroy_thread_windows( thread );
200 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
202 if (thread->inflight[i].client != -1)
204 close( thread->inflight[i].server );
205 thread->inflight[i].client = thread->inflight[i].server = -1;
208 thread->req_data = NULL;
209 thread->reply_data = NULL;
210 thread->request_fd = -1;
211 thread->reply_fd = -1;
212 thread->wait_fd = -1;
215 /* destroy a thread when its refcount is 0 */
216 static void destroy_thread( struct object *obj )
218 struct thread_apc *apc;
219 struct thread *thread = (struct thread *)obj;
220 assert( obj->ops == &thread_ops );
222 assert( !thread->debug_ctx ); /* cannot still be debugging something */
223 if (thread->next) thread->next->prev = thread->prev;
224 if (thread->prev) thread->prev->next = thread->next;
225 else first_thread = thread->next;
226 while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
227 if (thread->info) release_object( thread->info );
228 cleanup_thread( thread );
229 release_object( thread->process );
232 /* dump a thread on stdout for debugging purposes */
233 static void dump_thread( struct object *obj, int verbose )
235 struct thread *thread = (struct thread *)obj;
236 assert( obj->ops == &thread_ops );
238 fprintf( stderr, "Thread pid=%d teb=%p state=%d\n",
239 thread->unix_pid, thread->teb, thread->state );
242 static int thread_signaled( struct object *obj, struct thread *thread )
244 struct thread *mythread = (struct thread *)obj;
245 return (mythread->state == TERMINATED);
248 /* get a thread pointer from a thread id (and increment the refcount) */
249 struct thread *get_thread_from_id( void *id )
251 struct thread *t = first_thread;
252 while (t && (t != id)) t = t->next;
253 if (t) grab_object( t );
254 else set_error( STATUS_INVALID_PARAMETER );
258 /* get a thread from a handle (and increment the refcount) */
259 struct thread *get_thread_from_handle( handle_t handle, unsigned int access )
261 return (struct thread *)get_handle_obj( current->process, handle,
262 access, &thread_ops );
265 /* find a thread from a Unix pid */
266 struct thread *get_thread_from_pid( int pid )
268 struct thread *t = first_thread;
269 while (t && (t->unix_pid != pid)) t = t->next;
273 /* set all information about a thread */
274 static void set_thread_info( struct thread *thread,
275 const struct set_thread_info_request *req )
277 if (req->mask & SET_THREAD_INFO_PRIORITY)
278 thread->priority = req->priority;
279 if (req->mask & SET_THREAD_INFO_AFFINITY)
281 if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
282 else thread->affinity = req->affinity;
286 /* suspend a thread */
287 int suspend_thread( struct thread *thread, int check_limit )
289 int old_count = thread->suspend;
290 if (thread->suspend < MAXIMUM_SUSPEND_COUNT || !check_limit)
292 if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
294 else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
298 /* resume a thread */
299 int resume_thread( struct thread *thread )
301 int old_count = thread->suspend;
302 if (thread->suspend > 0)
304 if (!(--thread->suspend + thread->process->suspend)) continue_thread( thread );
309 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
310 int add_queue( struct object *obj, struct wait_queue_entry *entry )
314 entry->prev = obj->tail;
316 if (obj->tail) obj->tail->next = entry;
317 else obj->head = entry;
322 /* remove a thread from an object wait queue */
323 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
325 if (entry->next) entry->next->prev = entry->prev;
326 else obj->tail = entry->prev;
327 if (entry->prev) entry->prev->next = entry->next;
328 else obj->head = entry->next;
329 release_object( obj );
333 static void end_wait( struct thread *thread )
335 struct thread_wait *wait = thread->wait;
336 struct wait_queue_entry *entry;
340 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
341 entry->obj->ops->remove_queue( entry->obj, entry );
342 if (wait->user) remove_timeout_user( wait->user );
343 thread->wait = wait->next;
347 /* build the thread wait structure */
348 static int wait_on( int count, struct object *objects[], int flags, int sec, int usec )
350 struct thread_wait *wait;
351 struct wait_queue_entry *entry;
354 if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
355 wait->next = current->wait;
356 wait->thread = current;
360 current->wait = wait;
361 if (flags & SELECT_TIMEOUT)
363 wait->timeout.tv_sec = sec;
364 wait->timeout.tv_usec = usec;
367 for (i = 0, entry = wait->queues; i < count; i++, entry++)
369 struct object *obj = objects[i];
370 entry->thread = current;
371 if (!obj->ops->add_queue( obj, entry ))
381 /* check if the thread waiting condition is satisfied */
382 static int check_wait( struct thread *thread )
385 struct thread_wait *wait = thread->wait;
386 struct wait_queue_entry *entry = wait->queues;
389 if (wait->flags & SELECT_ALL)
392 /* Note: we must check them all anyway, as some objects may
393 * want to do something when signaled, even if others are not */
394 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
395 not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
396 if (not_ok) goto other_checks;
397 /* Wait satisfied: tell it to all objects */
399 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
400 if (entry->obj->ops->satisfied( entry->obj, thread ))
401 signaled = STATUS_ABANDONED_WAIT_0;
406 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
408 if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
409 /* Wait satisfied: tell it to the object */
411 if (entry->obj->ops->satisfied( entry->obj, thread ))
412 signaled = i + STATUS_ABANDONED_WAIT_0;
418 if ((wait->flags & SELECT_INTERRUPTIBLE) && thread->system_apc.head) return STATUS_USER_APC;
419 if ((wait->flags & SELECT_ALERTABLE) && thread->user_apc.head) return STATUS_USER_APC;
420 if (wait->flags & SELECT_TIMEOUT)
423 gettimeofday( &now, NULL );
424 if (!time_before( &now, &wait->timeout )) return STATUS_TIMEOUT;
429 /* send the wakeup signal to a thread */
430 static int send_thread_wakeup( struct thread *thread, void *cookie, int signaled )
432 struct wake_up_reply reply;
435 reply.cookie = cookie;
436 reply.signaled = signaled;
437 if ((ret = write( thread->wait_fd, &reply, sizeof(reply) )) == sizeof(reply)) return 0;
439 fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
440 else if (errno == EPIPE)
441 kill_thread( thread, 0 ); /* normal death */
443 fatal_protocol_perror( thread, "write" );
447 /* attempt to wake up a thread */
448 /* return >0 if OK, 0 if the wait condition is still not satisfied */
449 static int wake_thread( struct thread *thread )
454 for (count = 0; thread->wait; count++)
456 if ((signaled = check_wait( thread )) == -1) break;
458 cookie = thread->wait->cookie;
459 if (debug_level) fprintf( stderr, "%08x: *wakeup* signaled=%d cookie=%p\n",
460 (unsigned int)thread, signaled, cookie );
462 if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
468 /* thread wait timeout */
469 static void thread_timeout( void *ptr )
471 struct thread_wait *wait = ptr;
472 struct thread *thread = wait->thread;
473 void *cookie = wait->cookie;
476 if (thread->wait != wait) return; /* not the top-level wait, ignore it */
478 if (debug_level) fprintf( stderr, "%08x: *wakeup* signaled=%d cookie=%p\n",
479 (unsigned int)thread, STATUS_TIMEOUT, cookie );
481 send_thread_wakeup( thread, cookie, STATUS_TIMEOUT );
482 /* check if other objects have become signaled in the meantime */
483 wake_thread( thread );
486 /* select on a list of handles */
487 static void select_on( int count, void *cookie, const handle_t *handles,
488 int flags, int sec, int usec )
491 struct object *objects[MAXIMUM_WAIT_OBJECTS];
493 if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
495 set_error( STATUS_INVALID_PARAMETER );
498 for (i = 0; i < count; i++)
500 if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
504 if (i < count) goto done;
505 if (!wait_on( count, objects, flags, sec, usec )) goto done;
507 if ((ret = check_wait( current )) != -1)
509 /* condition is already satisfied */
515 /* now we need to wait */
516 if (flags & SELECT_TIMEOUT)
518 if (!(current->wait->user = add_timeout_user( ¤t->wait->timeout,
519 thread_timeout, current->wait )))
525 current->wait->cookie = cookie;
526 set_error( STATUS_PENDING );
529 while (--i >= 0) release_object( objects[i] );
532 /* attempt to wake threads sleeping on the object wait queue */
533 void wake_up( struct object *obj, int max )
535 struct wait_queue_entry *entry = obj->head;
539 struct thread *thread = entry->thread;
541 if (wake_thread( thread ))
543 if (max && !--max) break;
548 /* queue an async procedure call */
549 int thread_queue_apc( struct thread *thread, struct object *owner, void *func,
550 enum apc_type type, int system, int nb_args, ... )
552 struct thread_apc *apc;
553 struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
555 /* cancel a possible previous APC with the same owner */
556 if (owner) thread_cancel_apc( thread, owner, system );
558 if (!(apc = mem_alloc( sizeof(*apc) + (nb_args-1)*sizeof(apc->args[0]) ))) return 0;
559 apc->prev = queue->tail;
564 apc->nb_args = nb_args;
569 va_start( args, nb_args );
570 for (i = 0; i < nb_args; i++) apc->args[i] = va_arg( args, void * );
574 if (!apc->prev) /* first one */
577 wake_thread( thread );
579 else apc->prev->next = apc;
584 /* cancel the async procedure call owned by a specific object */
585 void thread_cancel_apc( struct thread *thread, struct object *owner, int system )
587 struct thread_apc *apc;
588 struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
589 for (apc = queue->head; apc; apc = apc->next)
591 if (apc->owner != owner) continue;
592 if (apc->next) apc->next->prev = apc->prev;
593 else queue->tail = apc->prev;
594 if (apc->prev) apc->prev->next = apc->next;
595 else queue->head = apc->next;
601 /* remove the head apc from the queue; the returned pointer must be freed by the caller */
602 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
604 struct thread_apc *apc;
605 struct apc_queue *queue = &thread->system_apc;
607 if (!queue->head && !system_only) queue = &thread->user_apc;
608 if ((apc = queue->head))
610 if (apc->next) apc->next->prev = NULL;
611 else queue->tail = NULL;
612 queue->head = apc->next;
617 /* add an fd to the inflight list */
618 /* return list index, or -1 on error */
619 int thread_add_inflight_fd( struct thread *thread, int client, int server )
623 if (server == -1) return -1;
630 /* first check if we already have an entry for this fd */
631 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
632 if (thread->inflight[i].client == client)
634 close( thread->inflight[i].server );
635 thread->inflight[i].server = server;
639 /* now find a free spot to store it */
640 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
641 if (thread->inflight[i].client == -1)
643 thread->inflight[i].client = client;
644 thread->inflight[i].server = server;
650 /* get an inflight fd and purge it from the list */
651 /* the fd must be closed when no longer used */
652 int thread_get_inflight_fd( struct thread *thread, int client )
656 if (client == -1) return -1;
660 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
662 if (thread->inflight[i].client == client)
664 ret = thread->inflight[i].server;
665 thread->inflight[i].server = thread->inflight[i].client = -1;
669 } while (!receive_fd( thread->process )); /* in case it is still in the socket buffer */
673 /* retrieve an LDT selector entry */
674 static void get_selector_entry( struct thread *thread, int entry,
675 unsigned int *base, unsigned int *limit,
676 unsigned char *flags )
678 if (!thread->process->ldt_copy)
680 set_error( STATUS_ACCESS_DENIED );
685 set_error( STATUS_INVALID_PARAMETER ); /* FIXME */
688 if (suspend_for_ptrace( thread ))
690 unsigned char flags_buf[4];
691 int *addr = (int *)thread->process->ldt_copy + entry;
692 if (read_thread_int( thread, addr, base ) == -1) goto done;
693 if (read_thread_int( thread, addr + 8192, limit ) == -1) goto done;
694 addr = (int *)thread->process->ldt_copy + 2*8192 + (entry >> 2);
695 if (read_thread_int( thread, addr, (int *)flags_buf ) == -1) goto done;
696 *flags = flags_buf[entry & 3];
698 resume_thread( thread );
702 /* kill a thread on the spot */
703 void kill_thread( struct thread *thread, int violent_death )
705 if (thread->state == TERMINATED) return; /* already killed */
706 thread->state = TERMINATED;
707 if (current == thread) current = NULL;
709 fprintf( stderr,"%08x: *killed* exit_code=%d\n",
710 (unsigned int)thread, thread->exit_code );
713 while (thread->wait) end_wait( thread );
714 send_thread_wakeup( thread, NULL, STATUS_PENDING );
715 /* if it is waiting on the socket, we don't need to send a SIGTERM */
718 kill_console_processes( thread, 0 );
719 debug_exit_thread( thread );
720 abandon_mutexes( thread );
721 remove_process_thread( thread->process, thread );
722 wake_up( &thread->obj, 0 );
723 detach_thread( thread, violent_death ? SIGTERM : 0 );
724 if (thread->request_fd == thread->obj.fd) thread->request_fd = -1;
725 if (thread->reply_fd == thread->obj.fd) thread->reply_fd = -1;
726 remove_select_user( &thread->obj );
727 cleanup_thread( thread );
728 release_object( thread );
731 /* take a snapshot of currently running threads */
732 struct thread_snapshot *thread_snap( int *count )
734 struct thread_snapshot *snapshot, *ptr;
735 struct thread *thread;
738 for (thread = first_thread; thread; thread = thread->next)
739 if (thread->state != TERMINATED) total++;
740 if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
742 for (thread = first_thread; thread; thread = thread->next)
744 if (thread->state == TERMINATED) continue;
745 ptr->thread = thread;
746 ptr->count = thread->obj.refcount;
747 ptr->priority = thread->priority;
748 grab_object( thread );
755 /* signal that we are finished booting on the client side */
756 DECL_HANDLER(boot_done)
758 debug_level = max( debug_level, req->debug_level );
759 if (current == booting_thread)
761 booting_thread = (struct thread *)~0UL; /* make sure it doesn't match other threads */
762 lock_master_socket(0); /* allow other clients now */
766 /* create a new thread */
767 DECL_HANDLER(new_thread)
769 struct thread *thread;
770 int request_fd = thread_get_inflight_fd( current, req->request_fd );
772 if (request_fd == -1 || fcntl( request_fd, F_SETFL, O_NONBLOCK ) == -1)
774 if (request_fd != -1) close( request_fd );
775 set_error( STATUS_INVALID_HANDLE );
779 if ((thread = create_thread( request_fd, current->process )))
781 if (req->suspend) thread->suspend++;
783 if ((reply->handle = alloc_handle( current->process, thread,
784 THREAD_ALL_ACCESS, req->inherit )))
786 /* thread object will be released when the thread gets killed */
789 kill_thread( thread, 1 );
794 /* initialize a new thread */
795 DECL_HANDLER(init_thread)
797 int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
798 int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
800 if (current->unix_pid)
802 fatal_protocol_error( current, "init_thread: already running\n" );
805 if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1)
807 fatal_protocol_error( current, "bad reply fd\n" );
812 fatal_protocol_error( current, "bad wait fd\n" );
816 current->unix_pid = req->unix_pid;
817 current->teb = req->teb;
818 current->reply_fd = reply_fd;
819 current->wait_fd = wait_fd;
821 if (current->suspend + current->process->suspend > 0) stop_thread( current );
822 if (current->process->running_threads > 1)
823 generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
825 reply->pid = get_process_id( current->process );
826 reply->tid = get_thread_id( current );
827 reply->boot = (current == booting_thread);
828 reply->version = SERVER_PROTOCOL_VERSION;
832 if (reply_fd != -1) close( reply_fd );
833 if (wait_fd != -1) close( wait_fd );
836 /* terminate a thread */
837 DECL_HANDLER(terminate_thread)
839 struct thread *thread;
843 if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
845 thread->exit_code = req->exit_code;
846 if (thread != current) kill_thread( thread, 1 );
850 reply->last = (thread->process->running_threads == 1);
852 release_object( thread );
856 /* fetch information about a thread */
857 DECL_HANDLER(get_thread_info)
859 struct thread *thread;
860 handle_t handle = req->handle;
862 if (!handle) thread = get_thread_from_id( req->tid_in );
863 else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
867 reply->tid = get_thread_id( thread );
868 reply->teb = thread->teb;
869 reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
870 reply->priority = thread->priority;
871 release_object( thread );
875 /* set information about a thread */
876 DECL_HANDLER(set_thread_info)
878 struct thread *thread;
880 if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
882 set_thread_info( thread, req );
883 release_object( thread );
887 /* suspend a thread */
888 DECL_HANDLER(suspend_thread)
890 struct thread *thread;
892 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
894 reply->count = suspend_thread( thread, 1 );
895 release_object( thread );
899 /* resume a thread */
900 DECL_HANDLER(resume_thread)
902 struct thread *thread;
904 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
906 reply->count = resume_thread( thread );
907 release_object( thread );
911 /* select on a handle list */
914 int count = get_req_data_size() / sizeof(int);
915 select_on( count, req->cookie, get_req_data(), req->flags, req->sec, req->usec );
918 /* queue an APC for a thread */
919 DECL_HANDLER(queue_apc)
921 struct thread *thread;
922 if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
924 thread_queue_apc( thread, NULL, req->func, APC_USER, !req->user, 1, req->param );
925 release_object( thread );
929 /* get next APC to call */
930 DECL_HANDLER(get_apc)
932 struct thread_apc *apc;
937 if (!(apc = thread_dequeue_apc( current, !req->alertable )))
941 reply->type = APC_NONE;
944 /* Optimization: ignore APCs that have a NULL func; they are only used
945 * to wake up a thread, but since we got here the thread woke up already.
947 if (apc->func) break;
950 size = apc->nb_args * sizeof(apc->args[0]);
951 if (size > get_reply_max_size()) size = get_reply_max_size();
952 reply->func = apc->func;
953 reply->type = apc->type;
954 set_reply_data( apc->args, size );
958 /* fetch a selector entry for a thread */
959 DECL_HANDLER(get_selector_entry)
961 struct thread *thread;
962 if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
964 get_selector_entry( thread, req->entry, &reply->base, &reply->limit, &reply->flags );
965 release_object( thread );