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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 #include "wine/port.h"
32 #include <sys/types.h>
40 #define WIN32_NO_STATUS
57 struct thread_wait *next; /* next wait structure for this thread */
58 struct thread *thread; /* owner thread */
59 int count; /* count of objects */
61 void *cookie; /* magic cookie to return to client */
63 struct timeout_user *user;
64 struct wait_queue_entry queues[1];
67 /* asynchronous procedure calls */
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 */
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 );
85 static const struct object_ops thread_apc_ops =
87 sizeof(struct thread_apc), /* size */
88 dump_thread_apc, /* dump */
89 add_queue, /* add_queue */
90 remove_queue, /* remove_queue */
91 thread_apc_signaled, /* signaled */
92 no_satisfied, /* satisfied */
93 no_signal, /* signal */
94 no_get_fd, /* get_fd */
95 no_map_access, /* map_access */
96 no_lookup_name, /* lookup_name */
97 no_open_file, /* open_file */
98 no_close_handle, /* close_handle */
99 thread_apc_destroy /* destroy */
103 /* thread operations */
105 static void dump_thread( struct object *obj, int verbose );
106 static int thread_signaled( struct object *obj, struct thread *thread );
107 static unsigned int thread_map_access( struct object *obj, unsigned int access );
108 static void thread_poll_event( struct fd *fd, int event );
109 static void destroy_thread( struct object *obj );
111 static const struct object_ops thread_ops =
113 sizeof(struct thread), /* size */
114 dump_thread, /* dump */
115 add_queue, /* add_queue */
116 remove_queue, /* remove_queue */
117 thread_signaled, /* signaled */
118 no_satisfied, /* satisfied */
119 no_signal, /* signal */
120 no_get_fd, /* get_fd */
121 thread_map_access, /* map_access */
122 no_lookup_name, /* lookup_name */
123 no_open_file, /* open_file */
124 no_close_handle, /* close_handle */
125 destroy_thread /* destroy */
128 static const struct fd_ops thread_fd_ops =
130 NULL, /* get_poll_events */
131 thread_poll_event, /* poll_event */
133 NULL, /* get_fd_type */
135 NULL, /* queue_async */
136 NULL, /* reselect_async */
137 NULL /* cancel_async */
140 static struct list thread_list = LIST_INIT(thread_list);
142 /* initialize the structure for a newly allocated thread */
143 static inline void init_thread_structure( struct thread *thread )
147 thread->unix_pid = -1; /* not known yet */
148 thread->unix_tid = -1; /* not known yet */
149 thread->context = NULL;
150 thread->suspend_context = NULL;
152 thread->debug_ctx = NULL;
153 thread->debug_event = NULL;
154 thread->debug_break = 0;
155 thread->queue = NULL;
158 thread->req_data = NULL;
159 thread->req_toread = 0;
160 thread->reply_data = NULL;
161 thread->reply_towrite = 0;
162 thread->request_fd = NULL;
163 thread->reply_fd = NULL;
164 thread->wait_fd = NULL;
165 thread->state = RUNNING;
166 thread->exit_code = 0;
167 thread->priority = 0;
168 thread->affinity = 1;
170 thread->desktop_users = 0;
171 thread->token = NULL;
173 thread->creation_time = current_time;
174 thread->exit_time = 0;
176 list_init( &thread->mutex_list );
177 list_init( &thread->system_apc );
178 list_init( &thread->user_apc );
180 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
181 thread->inflight[i].server = thread->inflight[i].client = -1;
184 /* check if address looks valid for a client-side data structure (TEB etc.) */
185 static inline int is_valid_address( void *addr )
187 return addr && !((unsigned long)addr % sizeof(int));
190 /* create a new thread */
191 struct thread *create_thread( int fd, struct process *process )
193 struct thread *thread;
195 if (!(thread = alloc_object( &thread_ops ))) return NULL;
197 init_thread_structure( thread );
199 thread->process = (struct process *)grab_object( process );
200 thread->desktop = process->desktop;
201 if (!current) current = thread;
203 list_add_head( &thread_list, &thread->entry );
205 if (!(thread->id = alloc_ptid( thread )))
207 release_object( thread );
210 if (!(thread->request_fd = create_anonymous_fd( &thread_fd_ops, fd, &thread->obj, 0 )))
212 release_object( thread );
216 set_fd_events( thread->request_fd, POLLIN ); /* start listening to events */
217 add_process_thread( thread->process, thread );
221 /* handle a client event */
222 static void thread_poll_event( struct fd *fd, int event )
224 struct thread *thread = get_fd_user( fd );
225 assert( thread->obj.ops == &thread_ops );
227 if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
228 else if (event & POLLIN) read_request( thread );
229 else if (event & POLLOUT) write_reply( thread );
232 /* cleanup everything that is no longer needed by a dead thread */
233 /* used by destroy_thread and kill_thread */
234 static void cleanup_thread( struct thread *thread )
238 clear_apc_queue( &thread->system_apc );
239 clear_apc_queue( &thread->user_apc );
240 free( thread->req_data );
241 free( thread->reply_data );
242 if (thread->request_fd) release_object( thread->request_fd );
243 if (thread->reply_fd) release_object( thread->reply_fd );
244 if (thread->wait_fd) release_object( thread->wait_fd );
245 free( thread->suspend_context );
246 free_msg_queue( thread );
247 cleanup_clipboard_thread(thread);
248 destroy_thread_windows( thread );
249 close_thread_desktop( thread );
250 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
252 if (thread->inflight[i].client != -1)
254 close( thread->inflight[i].server );
255 thread->inflight[i].client = thread->inflight[i].server = -1;
258 thread->req_data = NULL;
259 thread->reply_data = NULL;
260 thread->request_fd = NULL;
261 thread->reply_fd = NULL;
262 thread->wait_fd = NULL;
263 thread->context = NULL;
264 thread->suspend_context = NULL;
268 /* destroy a thread when its refcount is 0 */
269 static void destroy_thread( struct object *obj )
271 struct thread *thread = (struct thread *)obj;
272 assert( obj->ops == &thread_ops );
274 assert( !thread->debug_ctx ); /* cannot still be debugging something */
275 list_remove( &thread->entry );
276 cleanup_thread( thread );
277 release_object( thread->process );
278 if (thread->id) free_ptid( thread->id );
279 if (thread->token) release_object( thread->token );
282 /* dump a thread on stdout for debugging purposes */
283 static void dump_thread( struct object *obj, int verbose )
285 struct thread *thread = (struct thread *)obj;
286 assert( obj->ops == &thread_ops );
288 fprintf( stderr, "Thread id=%04x unix pid=%d unix tid=%d teb=%p state=%d\n",
289 thread->id, thread->unix_pid, thread->unix_tid, thread->teb, thread->state );
292 static int thread_signaled( struct object *obj, struct thread *thread )
294 struct thread *mythread = (struct thread *)obj;
295 return (mythread->state == TERMINATED);
298 static unsigned int thread_map_access( struct object *obj, unsigned int access )
300 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SYNCHRONIZE;
301 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SYNCHRONIZE;
302 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
303 if (access & GENERIC_ALL) access |= THREAD_ALL_ACCESS;
304 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
307 static void dump_thread_apc( struct object *obj, int verbose )
309 struct thread_apc *apc = (struct thread_apc *)obj;
310 assert( obj->ops == &thread_apc_ops );
312 fprintf( stderr, "APC owner=%p type=%u\n", apc->owner, apc->call.type );
315 static int thread_apc_signaled( struct object *obj, struct thread *thread )
317 struct thread_apc *apc = (struct thread_apc *)obj;
318 return apc->executed;
321 static void thread_apc_destroy( struct object *obj )
323 struct thread_apc *apc = (struct thread_apc *)obj;
324 if (apc->caller) release_object( apc->caller );
325 if (apc->owner) release_object( apc->owner );
328 /* queue an async procedure call */
329 static struct thread_apc *create_apc( struct object *owner, const apc_call_t *call_data )
331 struct thread_apc *apc;
333 if ((apc = alloc_object( &thread_apc_ops )))
335 apc->call = *call_data;
339 apc->result.type = APC_NONE;
340 if (owner) grab_object( owner );
345 /* get a thread pointer from a thread id (and increment the refcount) */
346 struct thread *get_thread_from_id( thread_id_t id )
348 struct object *obj = get_ptid_entry( id );
350 if (obj && obj->ops == &thread_ops) return (struct thread *)grab_object( obj );
351 set_error( STATUS_INVALID_CID );
355 /* get a thread from a handle (and increment the refcount) */
356 struct thread *get_thread_from_handle( obj_handle_t handle, unsigned int access )
358 return (struct thread *)get_handle_obj( current->process, handle,
359 access, &thread_ops );
362 /* find a thread from a Unix tid */
363 struct thread *get_thread_from_tid( int tid )
365 struct thread *thread;
367 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
369 if (thread->unix_tid == tid) return thread;
374 /* find a thread from a Unix pid */
375 struct thread *get_thread_from_pid( int pid )
377 struct thread *thread;
379 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
381 if (thread->unix_pid == pid) return thread;
386 /* set all information about a thread */
387 static void set_thread_info( struct thread *thread,
388 const struct set_thread_info_request *req )
390 if (req->mask & SET_THREAD_INFO_PRIORITY)
391 thread->priority = req->priority;
392 if (req->mask & SET_THREAD_INFO_AFFINITY)
394 if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
395 else thread->affinity = req->affinity;
397 if (req->mask & SET_THREAD_INFO_TOKEN)
398 security_set_thread_token( thread, req->token );
401 /* stop a thread (at the Unix level) */
402 void stop_thread( struct thread *thread )
404 if (thread->context) return; /* already inside a debug event, no need for a signal */
405 /* can't stop a thread while initialisation is in progress */
406 if (is_process_init_done(thread->process)) send_thread_signal( thread, SIGUSR1 );
409 /* suspend a thread */
410 static int suspend_thread( struct thread *thread )
412 int old_count = thread->suspend;
413 if (thread->suspend < MAXIMUM_SUSPEND_COUNT)
415 if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
417 else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
421 /* resume a thread */
422 static int resume_thread( struct thread *thread )
424 int old_count = thread->suspend;
425 if (thread->suspend > 0)
427 if (!(--thread->suspend + thread->process->suspend)) wake_thread( thread );
432 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
433 int add_queue( struct object *obj, struct wait_queue_entry *entry )
437 list_add_tail( &obj->wait_queue, &entry->entry );
441 /* remove a thread from an object wait queue */
442 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
444 list_remove( &entry->entry );
445 release_object( obj );
449 static void end_wait( struct thread *thread )
451 struct thread_wait *wait = thread->wait;
452 struct wait_queue_entry *entry;
456 thread->wait = wait->next;
457 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
458 entry->obj->ops->remove_queue( entry->obj, entry );
459 if (wait->user) remove_timeout_user( wait->user );
463 /* build the thread wait structure */
464 static int wait_on( unsigned int count, struct object *objects[], int flags, timeout_t timeout )
466 struct thread_wait *wait;
467 struct wait_queue_entry *entry;
470 if (!(wait = mem_alloc( FIELD_OFFSET(struct thread_wait, queues[count]) ))) return 0;
471 wait->next = current->wait;
472 wait->thread = current;
476 wait->timeout = timeout;
477 current->wait = wait;
479 for (i = 0, entry = wait->queues; i < count; i++, entry++)
481 struct object *obj = objects[i];
482 entry->thread = current;
483 if (!obj->ops->add_queue( obj, entry ))
493 /* check if the thread waiting condition is satisfied */
494 static int check_wait( struct thread *thread )
497 struct thread_wait *wait = thread->wait;
498 struct wait_queue_entry *entry = wait->queues;
502 if ((wait->flags & SELECT_INTERRUPTIBLE) && !list_empty( &thread->system_apc ))
503 return STATUS_USER_APC;
505 /* Suspended threads may not acquire locks, but they can run system APCs */
506 if (thread->process->suspend + thread->suspend > 0) return -1;
508 if (wait->flags & SELECT_ALL)
511 /* Note: we must check them all anyway, as some objects may
512 * want to do something when signaled, even if others are not */
513 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
514 not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
515 if (not_ok) goto other_checks;
516 /* Wait satisfied: tell it to all objects */
518 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
519 if (entry->obj->ops->satisfied( entry->obj, thread ))
520 signaled = STATUS_ABANDONED_WAIT_0;
525 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
527 if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
528 /* Wait satisfied: tell it to the object */
530 if (entry->obj->ops->satisfied( entry->obj, thread ))
531 signaled = i + STATUS_ABANDONED_WAIT_0;
537 if ((wait->flags & SELECT_ALERTABLE) && !list_empty(&thread->user_apc)) return STATUS_USER_APC;
538 if (wait->timeout <= current_time) return STATUS_TIMEOUT;
542 /* send the wakeup signal to a thread */
543 static int send_thread_wakeup( struct thread *thread, void *cookie, int signaled )
545 struct wake_up_reply reply;
548 reply.cookie = cookie;
549 reply.signaled = signaled;
550 if ((ret = write( get_unix_fd( thread->wait_fd ), &reply, sizeof(reply) )) == sizeof(reply))
553 fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
554 else if (errno == EPIPE)
555 kill_thread( thread, 0 ); /* normal death */
557 fatal_protocol_perror( thread, "write" );
561 /* attempt to wake up a thread */
562 /* return >0 if OK, 0 if the wait condition is still not satisfied */
563 int wake_thread( struct thread *thread )
568 for (count = 0; thread->wait; count++)
570 if ((signaled = check_wait( thread )) == -1) break;
572 cookie = thread->wait->cookie;
573 if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d cookie=%p\n",
574 thread->id, signaled, cookie );
576 if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
582 /* thread wait timeout */
583 static void thread_timeout( void *ptr )
585 struct thread_wait *wait = ptr;
586 struct thread *thread = wait->thread;
587 void *cookie = wait->cookie;
590 if (thread->wait != wait) return; /* not the top-level wait, ignore it */
591 if (thread->suspend + thread->process->suspend > 0) return; /* suspended, ignore it */
593 if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d cookie=%p\n",
594 thread->id, (int)STATUS_TIMEOUT, cookie );
596 if (send_thread_wakeup( thread, cookie, STATUS_TIMEOUT ) == -1) return;
597 /* check if other objects have become signaled in the meantime */
598 wake_thread( thread );
601 /* try signaling an event flag, a semaphore or a mutex */
602 static int signal_object( obj_handle_t handle )
607 obj = get_handle_obj( current->process, handle, 0, NULL );
610 ret = obj->ops->signal( obj, get_handle_access( current->process, handle ));
611 release_object( obj );
616 /* select on a list of handles */
617 static timeout_t select_on( unsigned int count, void *cookie, const obj_handle_t *handles,
618 int flags, timeout_t timeout, obj_handle_t signal_obj )
622 struct object *objects[MAXIMUM_WAIT_OBJECTS];
624 if (timeout <= 0) timeout = current_time - timeout;
626 if (count > MAXIMUM_WAIT_OBJECTS)
628 set_error( STATUS_INVALID_PARAMETER );
631 for (i = 0; i < count; i++)
633 if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
637 if (i < count) goto done;
638 if (!wait_on( count, objects, flags, timeout )) goto done;
640 /* signal the object */
643 if (!signal_object( signal_obj ))
648 /* check if we woke ourselves up */
649 if (!current->wait) goto done;
652 if ((ret = check_wait( current )) != -1)
654 /* condition is already satisfied */
660 /* now we need to wait */
661 if (current->wait->timeout != TIMEOUT_INFINITE)
663 if (!(current->wait->user = add_timeout_user( current->wait->timeout,
664 thread_timeout, current->wait )))
670 current->wait->cookie = cookie;
671 set_error( STATUS_PENDING );
674 while (i > 0) release_object( objects[--i] );
678 /* attempt to wake threads sleeping on the object wait queue */
679 void wake_up( struct object *obj, int max )
681 struct list *ptr, *next;
683 LIST_FOR_EACH_SAFE( ptr, next, &obj->wait_queue )
685 struct wait_queue_entry *entry = LIST_ENTRY( ptr, struct wait_queue_entry, entry );
686 if (wake_thread( entry->thread ))
688 if (max && !--max) break;
693 /* return the apc queue to use for a given apc type */
694 static inline struct list *get_apc_queue( struct thread *thread, enum apc_type type )
701 return &thread->user_apc;
703 return &thread->system_apc;
707 /* queue an existing APC to a given thread */
708 static int queue_apc( struct process *process, struct thread *thread, struct thread_apc *apc )
712 if (!thread) /* find a suitable thread inside the process */
714 struct thread *candidate;
716 /* first try to find a waiting thread */
717 LIST_FOR_EACH_ENTRY( candidate, &process->thread_list, struct thread, proc_entry )
719 if (candidate->state == TERMINATED) continue;
720 if (process->suspend || candidate->suspend ||
721 (candidate->wait && (candidate->wait->flags & SELECT_INTERRUPTIBLE)))
729 /* then use the first one that accepts a signal */
730 LIST_FOR_EACH_ENTRY( candidate, &process->thread_list, struct thread, proc_entry )
732 if (send_thread_signal( candidate, SIGUSR1 ))
739 if (!thread) return 0; /* nothing found */
743 if (thread->state == TERMINATED) return 0;
744 /* cancel a possible previous APC with the same owner */
745 if (apc->owner) thread_cancel_apc( thread, apc->owner, apc->call.type );
748 queue = get_apc_queue( thread, apc->call.type );
750 list_add_tail( queue, &apc->entry );
751 if (!list_prev( queue, &apc->entry )) /* first one */
752 wake_thread( thread );
757 /* queue an async procedure call */
758 int thread_queue_apc( struct thread *thread, struct object *owner, const apc_call_t *call_data )
760 struct thread_apc *apc;
763 if ((apc = create_apc( owner, call_data )))
765 ret = queue_apc( NULL, thread, apc );
766 release_object( apc );
771 /* cancel the async procedure call owned by a specific object */
772 void thread_cancel_apc( struct thread *thread, struct object *owner, enum apc_type type )
774 struct thread_apc *apc;
775 struct list *queue = get_apc_queue( thread, type );
777 LIST_FOR_EACH_ENTRY( apc, queue, struct thread_apc, entry )
779 if (apc->owner != owner) continue;
780 list_remove( &apc->entry );
782 wake_up( &apc->obj, 0 );
783 release_object( apc );
788 /* remove the head apc from the queue; the returned object must be released by the caller */
789 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
791 struct thread_apc *apc = NULL;
792 struct list *ptr = list_head( &thread->system_apc );
794 if (!ptr && !system_only) ptr = list_head( &thread->user_apc );
797 apc = LIST_ENTRY( ptr, struct thread_apc, entry );
803 /* clear an APC queue, cancelling all the APCs on it */
804 static void clear_apc_queue( struct list *queue )
808 while ((ptr = list_head( queue )))
810 struct thread_apc *apc = LIST_ENTRY( ptr, struct thread_apc, entry );
811 list_remove( &apc->entry );
813 wake_up( &apc->obj, 0 );
814 release_object( apc );
818 /* add an fd to the inflight list */
819 /* return list index, or -1 on error */
820 int thread_add_inflight_fd( struct thread *thread, int client, int server )
824 if (server == -1) return -1;
831 /* first check if we already have an entry for this fd */
832 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
833 if (thread->inflight[i].client == client)
835 close( thread->inflight[i].server );
836 thread->inflight[i].server = server;
840 /* now find a free spot to store it */
841 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
842 if (thread->inflight[i].client == -1)
844 thread->inflight[i].client = client;
845 thread->inflight[i].server = server;
851 /* get an inflight fd and purge it from the list */
852 /* the fd must be closed when no longer used */
853 int thread_get_inflight_fd( struct thread *thread, int client )
857 if (client == -1) return -1;
861 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
863 if (thread->inflight[i].client == client)
865 ret = thread->inflight[i].server;
866 thread->inflight[i].server = thread->inflight[i].client = -1;
870 } while (!receive_fd( thread->process )); /* in case it is still in the socket buffer */
874 /* kill a thread on the spot */
875 void kill_thread( struct thread *thread, int violent_death )
877 if (thread->state == TERMINATED) return; /* already killed */
878 thread->state = TERMINATED;
879 thread->exit_time = current_time;
880 if (current == thread) current = NULL;
882 fprintf( stderr,"%04x: *killed* exit_code=%d\n",
883 thread->id, thread->exit_code );
886 while (thread->wait) end_wait( thread );
887 send_thread_wakeup( thread, NULL, STATUS_PENDING );
888 /* if it is waiting on the socket, we don't need to send a SIGTERM */
891 kill_console_processes( thread, 0 );
892 debug_exit_thread( thread );
893 abandon_mutexes( thread );
894 wake_up( &thread->obj, 0 );
895 if (violent_death) send_thread_signal( thread, SIGTERM );
896 cleanup_thread( thread );
897 remove_process_thread( thread->process, thread );
898 release_object( thread );
901 /* trigger a breakpoint event in a given thread */
902 void break_thread( struct thread *thread )
904 struct debug_event_exception data;
906 assert( thread->context );
908 data.record.ExceptionCode = STATUS_BREAKPOINT;
909 data.record.ExceptionFlags = EXCEPTION_CONTINUABLE;
910 data.record.ExceptionRecord = NULL;
911 data.record.ExceptionAddress = get_context_ip( thread->context );
912 data.record.NumberParameters = 0;
914 generate_debug_event( thread, EXCEPTION_DEBUG_EVENT, &data );
915 thread->debug_break = 0;
918 /* take a snapshot of currently running threads */
919 struct thread_snapshot *thread_snap( int *count )
921 struct thread_snapshot *snapshot, *ptr;
922 struct thread *thread;
925 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
926 if (thread->state != TERMINATED) total++;
927 if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
929 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
931 if (thread->state == TERMINATED) continue;
932 ptr->thread = thread;
933 ptr->count = thread->obj.refcount;
934 ptr->priority = thread->priority;
935 grab_object( thread );
942 /* gets the current impersonation token */
943 struct token *thread_get_impersonation_token( struct thread *thread )
946 return thread->token;
948 return thread->process->token;
951 /* create a new thread */
952 DECL_HANDLER(new_thread)
954 struct thread *thread;
955 int request_fd = thread_get_inflight_fd( current, req->request_fd );
957 if (request_fd == -1 || fcntl( request_fd, F_SETFL, O_NONBLOCK ) == -1)
959 if (request_fd != -1) close( request_fd );
960 set_error( STATUS_INVALID_HANDLE );
964 if ((thread = create_thread( request_fd, current->process )))
966 if (req->suspend) thread->suspend++;
967 reply->tid = get_thread_id( thread );
968 if ((reply->handle = alloc_handle( current->process, thread, req->access, req->attributes )))
970 /* thread object will be released when the thread gets killed */
973 kill_thread( thread, 1 );
977 /* initialize a new thread */
978 DECL_HANDLER(init_thread)
980 struct process *process = current->process;
981 int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
982 int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
984 if (current->reply_fd) /* already initialised */
986 set_error( STATUS_INVALID_PARAMETER );
990 if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1) goto error;
992 current->reply_fd = create_anonymous_fd( &thread_fd_ops, reply_fd, ¤t->obj, 0 );
994 if (!current->reply_fd) goto error;
998 set_error( STATUS_TOO_MANY_OPENED_FILES ); /* most likely reason */
1001 if (!(current->wait_fd = create_anonymous_fd( &thread_fd_ops, wait_fd, ¤t->obj, 0 )))
1004 if (!is_valid_address(req->teb) || !is_valid_address(req->peb) || !is_valid_address(req->ldt_copy))
1006 set_error( STATUS_INVALID_PARAMETER );
1010 current->unix_pid = req->unix_pid;
1011 current->unix_tid = req->unix_tid;
1012 current->teb = req->teb;
1014 if (!process->peb) /* first thread, initialize the process too */
1016 process->unix_pid = current->unix_pid;
1017 process->peb = req->peb;
1018 process->ldt_copy = req->ldt_copy;
1019 reply->info_size = init_process( current );
1023 if (process->unix_pid != current->unix_pid)
1024 process->unix_pid = -1; /* can happen with linuxthreads */
1025 if (current->suspend + process->suspend > 0) stop_thread( current );
1026 generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
1028 debug_level = max( debug_level, req->debug_level );
1030 reply->pid = get_process_id( process );
1031 reply->tid = get_thread_id( current );
1032 reply->version = SERVER_PROTOCOL_VERSION;
1033 reply->server_start = server_start_time;
1037 if (reply_fd != -1) close( reply_fd );
1038 if (wait_fd != -1) close( wait_fd );
1041 /* terminate a thread */
1042 DECL_HANDLER(terminate_thread)
1044 struct thread *thread;
1048 if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
1050 thread->exit_code = req->exit_code;
1051 if (thread != current) kill_thread( thread, 1 );
1055 reply->last = (thread->process->running_threads == 1);
1057 release_object( thread );
1061 /* open a handle to a thread */
1062 DECL_HANDLER(open_thread)
1064 struct thread *thread = get_thread_from_id( req->tid );
1069 reply->handle = alloc_handle( current->process, thread, req->access, req->attributes );
1070 release_object( thread );
1074 /* fetch information about a thread */
1075 DECL_HANDLER(get_thread_info)
1077 struct thread *thread;
1078 obj_handle_t handle = req->handle;
1080 if (!handle) thread = get_thread_from_id( req->tid_in );
1081 else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
1085 reply->pid = get_process_id( thread->process );
1086 reply->tid = get_thread_id( thread );
1087 reply->teb = thread->teb;
1088 reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STATUS_PENDING;
1089 reply->priority = thread->priority;
1090 reply->affinity = thread->affinity;
1091 reply->creation_time = thread->creation_time;
1092 reply->exit_time = thread->exit_time;
1093 reply->last = thread->process->running_threads == 1;
1095 release_object( thread );
1099 /* set information about a thread */
1100 DECL_HANDLER(set_thread_info)
1102 struct thread *thread;
1104 if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
1106 set_thread_info( thread, req );
1107 release_object( thread );
1111 /* suspend a thread */
1112 DECL_HANDLER(suspend_thread)
1114 struct thread *thread;
1116 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
1118 if (thread->state == TERMINATED) set_error( STATUS_ACCESS_DENIED );
1119 else reply->count = suspend_thread( thread );
1120 release_object( thread );
1124 /* resume a thread */
1125 DECL_HANDLER(resume_thread)
1127 struct thread *thread;
1129 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
1131 if (thread->state == TERMINATED) set_error( STATUS_ACCESS_DENIED );
1132 else reply->count = resume_thread( thread );
1133 release_object( thread );
1137 /* select on a handle list */
1138 DECL_HANDLER(select)
1140 unsigned int count = get_req_data_size() / sizeof(obj_handle_t);
1141 reply->timeout = select_on( count, req->cookie, get_req_data(), req->flags, req->timeout, req->signal );
1144 /* queue an APC for a thread or process */
1145 DECL_HANDLER(queue_apc)
1147 struct thread *thread = NULL;
1148 struct process *process = NULL;
1149 struct thread_apc *apc;
1151 if (!(apc = create_apc( NULL, &req->call ))) return;
1153 switch (apc->call.type)
1157 thread = get_thread_from_handle( req->thread, THREAD_SET_CONTEXT );
1159 case APC_VIRTUAL_ALLOC:
1160 case APC_VIRTUAL_FREE:
1161 case APC_VIRTUAL_PROTECT:
1162 case APC_VIRTUAL_FLUSH:
1163 case APC_VIRTUAL_LOCK:
1164 case APC_VIRTUAL_UNLOCK:
1165 case APC_UNMAP_VIEW:
1166 process = get_process_from_handle( req->process, PROCESS_VM_OPERATION );
1168 case APC_VIRTUAL_QUERY:
1169 process = get_process_from_handle( req->process, PROCESS_QUERY_INFORMATION );
1172 process = get_process_from_handle( req->process, PROCESS_VM_OPERATION );
1173 if (process && process != current->process)
1175 /* duplicate the handle into the target process */
1176 obj_handle_t handle = duplicate_handle( current->process, apc->call.map_view.handle,
1177 process, 0, 0, DUP_HANDLE_SAME_ACCESS );
1178 if (handle) apc->call.map_view.handle = handle;
1181 release_object( process );
1186 case APC_CREATE_THREAD:
1187 process = get_process_from_handle( req->process, PROCESS_CREATE_THREAD );
1190 set_error( STATUS_INVALID_PARAMETER );
1196 if (!queue_apc( NULL, thread, apc )) set_error( STATUS_THREAD_IS_TERMINATING );
1197 release_object( thread );
1201 reply->self = (process == current->process);
1204 obj_handle_t handle = alloc_handle( current->process, apc, SYNCHRONIZE, 0 );
1207 if (queue_apc( process, NULL, apc ))
1209 apc->caller = (struct thread *)grab_object( current );
1210 reply->handle = handle;
1214 close_handle( current->process, handle );
1215 set_error( STATUS_PROCESS_IS_TERMINATING );
1219 release_object( process );
1222 release_object( apc );
1225 /* get next APC to call */
1226 DECL_HANDLER(get_apc)
1228 struct thread_apc *apc;
1229 int system_only = !req->alertable;
1233 if (!(apc = (struct thread_apc *)get_handle_obj( current->process, req->prev,
1234 0, &thread_apc_ops ))) return;
1235 apc->result = req->result;
1237 if (apc->result.type == APC_CREATE_THREAD) /* transfer the handle to the caller process */
1239 obj_handle_t handle = duplicate_handle( current->process, apc->result.create_thread.handle,
1240 apc->caller->process, 0, 0, DUP_HANDLE_SAME_ACCESS );
1241 close_handle( current->process, apc->result.create_thread.handle );
1242 apc->result.create_thread.handle = handle;
1243 clear_error(); /* ignore errors from the above calls */
1245 else if (apc->result.type == APC_ASYNC_IO)
1247 if (apc->owner) async_set_result( apc->owner, apc->result.async_io.status );
1249 wake_up( &apc->obj, 0 );
1250 close_handle( current->process, req->prev );
1251 release_object( apc );
1254 if (current->suspend + current->process->suspend > 0) system_only = 1;
1258 if (!(apc = thread_dequeue_apc( current, system_only )))
1261 set_error( STATUS_PENDING );
1264 /* Optimization: ignore APC_NONE calls, they are only used to
1265 * wake up a thread, but since we got here the thread woke up already.
1267 if (apc->call.type != APC_NONE) break;
1269 wake_up( &apc->obj, 0 );
1270 release_object( apc );
1273 if ((reply->handle = alloc_handle( current->process, apc, SYNCHRONIZE, 0 )))
1274 reply->call = apc->call;
1275 release_object( apc );
1278 /* Get the result of an APC call */
1279 DECL_HANDLER(get_apc_result)
1281 struct thread_apc *apc;
1283 if (!(apc = (struct thread_apc *)get_handle_obj( current->process, req->handle,
1284 0, &thread_apc_ops ))) return;
1285 if (!apc->executed) set_error( STATUS_PENDING );
1288 reply->result = apc->result;
1289 /* close the handle directly to avoid an extra round-trip */
1290 close_handle( current->process, req->handle );
1292 release_object( apc );
1295 /* retrieve the current context of a thread */
1296 DECL_HANDLER(get_thread_context)
1298 struct thread *thread;
1301 if (get_reply_max_size() < sizeof(CONTEXT))
1303 set_error( STATUS_INVALID_PARAMETER );
1306 if (!(thread = get_thread_from_handle( req->handle, THREAD_GET_CONTEXT ))) return;
1310 if (thread != current || !thread->suspend_context)
1312 /* not suspended, shouldn't happen */
1313 set_error( STATUS_INVALID_PARAMETER );
1317 if (thread->context == thread->suspend_context) thread->context = NULL;
1318 set_reply_data_ptr( thread->suspend_context, sizeof(CONTEXT) );
1319 thread->suspend_context = NULL;
1322 else if (thread != current && !thread->context)
1324 /* thread is not suspended, retry (if it's still running) */
1325 if (thread->state != RUNNING) set_error( STATUS_ACCESS_DENIED );
1326 else set_error( STATUS_PENDING );
1328 else if ((context = set_reply_data_size( sizeof(CONTEXT) )))
1330 unsigned int flags = get_context_system_regs( req->flags );
1332 memset( context, 0, sizeof(CONTEXT) );
1333 context->ContextFlags = get_context_cpu_flag();
1334 if (thread->context) copy_context( context, thread->context, req->flags & ~flags );
1335 if (flags) get_thread_context( thread, context, flags );
1337 reply->self = (thread == current);
1338 release_object( thread );
1341 /* set the current context of a thread */
1342 DECL_HANDLER(set_thread_context)
1344 struct thread *thread;
1346 if (get_req_data_size() < sizeof(CONTEXT))
1348 set_error( STATUS_INVALID_PARAMETER );
1351 if (!(thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT ))) return;
1355 if (thread != current || thread->context)
1357 /* nested suspend or exception, shouldn't happen */
1358 set_error( STATUS_INVALID_PARAMETER );
1360 else if ((thread->suspend_context = mem_alloc( sizeof(CONTEXT) )))
1362 memcpy( thread->suspend_context, get_req_data(), sizeof(CONTEXT) );
1363 thread->context = thread->suspend_context;
1364 if (thread->debug_break) break_thread( thread );
1367 else if (thread != current && !thread->context)
1369 /* thread is not suspended, retry (if it's still running) */
1370 if (thread->state != RUNNING) set_error( STATUS_ACCESS_DENIED );
1371 else set_error( STATUS_PENDING );
1375 const CONTEXT *context = get_req_data();
1376 unsigned int flags = get_context_system_regs( req->flags );
1378 if (flags) set_thread_context( thread, context, flags );
1379 if (thread->context && !get_error())
1380 copy_context( thread->context, context, req->flags & ~flags );
1382 reply->self = (thread == current);
1383 release_object( thread );
1386 /* fetch a selector entry for a thread */
1387 DECL_HANDLER(get_selector_entry)
1389 struct thread *thread;
1390 if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
1392 get_selector_entry( thread, req->entry, &reply->base, &reply->limit, &reply->flags );
1393 release_object( thread );