server/thread.c

   1 /*
   2  * Server-side thread management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <assert.h>
  10 #include <fcntl.h>
  11 #include <signal.h>
  12 #include <stdarg.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #ifdef HAVE_SYS_MMAN_H
  17 #include <sys/mman.h>
  18 #endif
  19 #include <sys/types.h>
  20 #ifdef HAVE_SYS_SOCKET_H
  21 # include <sys/socket.h>
  22 #endif
  23 #include <sys/uio.h>
  24 #include <unistd.h>
  25 #include <stdarg.h>
  26
  27 #include "winbase.h"
  28
  29 #include "handle.h"
  30 #include "process.h"
  31 #include "thread.h"
  32 #include "request.h"
  33
  34
  35 /* thread queues */
  36
  37 struct thread_wait
  38 {
  39     int                     count;      /* count of objects */
  40     int                     flags;
  41     struct timeval          timeout;
  42     struct timeout_user    *user;
  43     sleep_reply             reply;      /* function to build the reply */
  44     struct wait_queue_entry queues[1];
  45 };
  46
  47 /* asynchronous procedure calls */
  48
  49 struct thread_apc
  50 {
  51     struct thread_apc  *next;     /* queue linked list */
  52     struct thread_apc  *prev;
  53     struct object      *owner;    /* object that queued this apc */
  54     void               *func;     /* function to call in client */
  55     enum apc_type       type;     /* type of apc function */
  56     int                 nb_args;  /* number of arguments */
  57     void               *args[1];  /* function arguments */
  58 };
  59
  60
  61 /* thread operations */
  62
  63 static void dump_thread( struct object *obj, int verbose );
  64 static int thread_signaled( struct object *obj, struct thread *thread );
  65 extern void thread_poll_event( struct object *obj, int event );
  66 static void destroy_thread( struct object *obj );
  67 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only );
  68
  69 static const struct object_ops thread_ops =
  70 {
  71     sizeof(struct thread),      /* size */
  72     dump_thread,                /* dump */
  73     add_queue,                  /* add_queue */
  74     remove_queue,               /* remove_queue */
  75     thread_signaled,            /* signaled */
  76     no_satisfied,               /* satisfied */
  77     NULL,                       /* get_poll_events */
  78     thread_poll_event,          /* poll_event */
  79     no_get_fd,                  /* get_fd */
  80     no_flush,                   /* flush */
  81     no_get_file_info,           /* get_file_info */
  82     destroy_thread              /* destroy */
  83 };
  84
  85 static struct thread *first_thread;
  86 static struct thread *booting_thread;
  87
  88 /* allocate the buffer for the communication with the client */
  89 static int alloc_client_buffer( struct thread *thread )
  90 {
  91     struct get_thread_buffer_request *req;
  92     int fd, fd_pipe[2];
  93
  94     if (pipe( fd_pipe ) == -1)
  95     {
  96         file_set_error();
  97         return 0;
  98     }
  99     if ((fd = create_anonymous_file()) == -1) goto error;
 100     if (ftruncate( fd, MAX_REQUEST_LENGTH ) == -1) goto error;
 101     if ((thread->buffer = mmap( 0, MAX_REQUEST_LENGTH, PROT_READ | PROT_WRITE,
 102                                 MAP_SHARED, fd, 0 )) == (void*)-1) goto error;
 103     thread->buffer_info = (struct server_buffer_info *)((char *)thread->buffer + MAX_REQUEST_LENGTH) - 1;
 104     if (!(thread->request_fd = create_request_socket( thread ))) goto error;
 105     thread->reply_fd = fd_pipe[1];
 106     /* build the first request into the buffer and send it */
 107     req = thread->buffer;
 108     req->pid  = get_process_id( thread->process );
 109     req->tid  = get_thread_id( thread );
 110     req->boot = (thread == booting_thread);
 111     req->version = SERVER_PROTOCOL_VERSION;
 112
 113     /* add it here since send_client_fd may call kill_thread */
 114     add_process_thread( thread->process, thread );
 115
 116     send_client_fd( thread, fd_pipe[0], 0 );
 117     send_client_fd( thread, fd, 0 );
 118     send_reply( thread );
 119     close( fd_pipe[0] );
 120     close( fd );
 121     return 1;
 122
 123  error:
 124     file_set_error();
 125     if (fd != -1) close( fd );
 126     close( fd_pipe[0] );
 127     close( fd_pipe[1] );
 128     return 0;
 129 }
 130
 131 /* create a new thread */
 132 struct thread *create_thread( int fd, struct process *process )
 133 {
 134     struct thread *thread;
 135
 136     int flags = fcntl( fd, F_GETFL, 0 );
 137     fcntl( fd, F_SETFL, flags | O_NONBLOCK );
 138
 139     if (!(thread = alloc_object( &thread_ops, fd ))) return NULL;
 140
 141     thread->unix_pid    = 0;  /* not known yet */
 142     thread->context     = NULL;
 143     thread->teb         = NULL;
 144     thread->mutex       = NULL;
 145     thread->debug_ctx   = NULL;
 146     thread->debug_event = NULL;
 147     thread->queue       = NULL;
 148     thread->info        = NULL;
 149     thread->wait        = NULL;
 150     thread->system_apc.head = NULL;
 151     thread->system_apc.tail = NULL;
 152     thread->user_apc.head   = NULL;
 153     thread->user_apc.tail   = NULL;
 154     thread->error       = 0;
 155     thread->pass_fd     = -1;
 156     thread->request_fd  = NULL;
 157     thread->reply_fd    = -1;
 158     thread->state       = RUNNING;
 159     thread->attached    = 0;
 160     thread->exit_code   = 0;
 161     thread->next        = NULL;
 162     thread->prev        = NULL;
 163     thread->priority    = THREAD_PRIORITY_NORMAL;
 164     thread->affinity    = 1;
 165     thread->suspend     = 0;
 166     thread->buffer      = (void *)-1;
 167     thread->last_req    = REQ_GET_THREAD_BUFFER;
 168     thread->process     = (struct process *)grab_object( process );
 169
 170     if (!current) current = thread;
 171
 172     if (!booting_thread)  /* first thread ever */
 173     {
 174         booting_thread = thread;
 175         lock_master_socket(1);
 176     }
 177
 178     if ((thread->next = first_thread) != NULL) thread->next->prev = thread;
 179     first_thread = thread;
 180
 181     set_select_events( &thread->obj, POLLIN );  /* start listening to events */
 182     if (!alloc_client_buffer( thread )) goto error;
 183     return thread;
 184
 185  error:
 186     release_object( thread );
 187     return NULL;
 188 }
 189
 190 /* handle a client event */
 191 void thread_poll_event( struct object *obj, int event )
 192 {
 193     struct thread *thread = (struct thread *)obj;
 194     assert( obj->ops == &thread_ops );
 195
 196     if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
 197     else
 198     {
 199         if (event & POLLOUT) write_request( thread );
 200         if (event & POLLIN) read_request( thread );
 201     }
 202 }
 203
 204 /* destroy a thread when its refcount is 0 */
 205 static void destroy_thread( struct object *obj )
 206 {
 207     struct thread_apc *apc;
 208     struct thread *thread = (struct thread *)obj;
 209     assert( obj->ops == &thread_ops );
 210
 211     assert( !thread->debug_ctx );  /* cannot still be debugging something */
 212     release_object( thread->process );
 213     if (thread->next) thread->next->prev = thread->prev;
 214     if (thread->prev) thread->prev->next = thread->next;
 215     else first_thread = thread->next;
 216     while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
 217     if (thread->info) release_object( thread->info );
 218     if (thread->queue) release_object( thread->queue );
 219     if (thread->buffer != (void *)-1) munmap( thread->buffer, MAX_REQUEST_LENGTH );
 220     if (thread->reply_fd != -1) close( thread->reply_fd );
 221     if (thread->pass_fd != -1) close( thread->pass_fd );
 222     if (thread->request_fd) release_object( thread->request_fd );
 223 }
 224
 225 /* dump a thread on stdout for debugging purposes */
 226 static void dump_thread( struct object *obj, int verbose )
 227 {
 228     struct thread *thread = (struct thread *)obj;
 229     assert( obj->ops == &thread_ops );
 230
 231     fprintf( stderr, "Thread pid=%d teb=%p state=%d\n",
 232              thread->unix_pid, thread->teb, thread->state );
 233 }
 234
 235 static int thread_signaled( struct object *obj, struct thread *thread )
 236 {
 237     struct thread *mythread = (struct thread *)obj;
 238     return (mythread->state == TERMINATED);
 239 }
 240
 241 /* get a thread pointer from a thread id (and increment the refcount) */
 242 struct thread *get_thread_from_id( void *id )
 243 {
 244     struct thread *t = first_thread;
 245     while (t && (t != id)) t = t->next;
 246     if (t) grab_object( t );
 247     return t;
 248 }
 249
 250 /* get a thread from a handle (and increment the refcount) */
 251 struct thread *get_thread_from_handle( handle_t handle, unsigned int access )
 252 {
 253     return (struct thread *)get_handle_obj( current->process, handle,
 254                                             access, &thread_ops );
 255 }
 256
 257 /* find a thread from a Unix pid */
 258 struct thread *get_thread_from_pid( int pid )
 259 {
 260     struct thread *t = first_thread;
 261     while (t && (t->unix_pid != pid)) t = t->next;
 262     return t;
 263 }
 264
 265 /* set all information about a thread */
 266 static void set_thread_info( struct thread *thread,
 267                              struct set_thread_info_request *req )
 268 {
 269     if (req->mask & SET_THREAD_INFO_PRIORITY)
 270         thread->priority = req->priority;
 271     if (req->mask & SET_THREAD_INFO_AFFINITY)
 272     {
 273         if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
 274         else thread->affinity = req->affinity;
 275     }
 276 }
 277
 278 /* suspend a thread */
 279 int suspend_thread( struct thread *thread, int check_limit )
 280 {
 281     int old_count = thread->suspend;
 282     if (thread->suspend < MAXIMUM_SUSPEND_COUNT || !check_limit)
 283     {
 284         if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
 285     }
 286     else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
 287     return old_count;
 288 }
 289
 290 /* resume a thread */
 291 int resume_thread( struct thread *thread )
 292 {
 293     int old_count = thread->suspend;
 294     if (thread->suspend > 0)
 295     {
 296         if (!(--thread->suspend + thread->process->suspend)) continue_thread( thread );
 297     }
 298     return old_count;
 299 }
 300
 301 /* suspend all threads but the current */
 302 void suspend_all_threads( void )
 303 {
 304     struct thread *thread;
 305     for ( thread = first_thread; thread; thread = thread->next )
 306         if ( thread != current )
 307             suspend_thread( thread, 0 );
 308 }
 309
 310 /* resume all threads but the current */
 311 void resume_all_threads( void )
 312 {
 313     struct thread *thread;
 314     for ( thread = first_thread; thread; thread = thread->next )
 315         if ( thread != current )
 316             resume_thread( thread );
 317 }
 318
 319 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
 320 int add_queue( struct object *obj, struct wait_queue_entry *entry )
 321 {
 322     grab_object( obj );
 323     entry->obj    = obj;
 324     entry->prev   = obj->tail;
 325     entry->next   = NULL;
 326     if (obj->tail) obj->tail->next = entry;
 327     else obj->head = entry;
 328     obj->tail = entry;
 329     return 1;
 330 }
 331
 332 /* remove a thread from an object wait queue */
 333 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
 334 {
 335     if (entry->next) entry->next->prev = entry->prev;
 336     else obj->tail = entry->prev;
 337     if (entry->prev) entry->prev->next = entry->next;
 338     else obj->head = entry->next;
 339     release_object( obj );
 340 }
 341
 342 /* finish waiting */
 343 static void end_wait( struct thread *thread )
 344 {
 345     struct thread_wait *wait = thread->wait;
 346     struct wait_queue_entry *entry;
 347     int i;
 348
 349     assert( wait );
 350     for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 351         entry->obj->ops->remove_queue( entry->obj, entry );
 352     if (wait->user) remove_timeout_user( wait->user );
 353     free( wait );
 354     thread->wait = NULL;
 355 }
 356
 357 /* build the thread wait structure */
 358 static int wait_on( int count, struct object *objects[], int flags,
 359                     int sec, int usec, sleep_reply func )
 360 {
 361     struct thread_wait *wait;
 362     struct wait_queue_entry *entry;
 363     int i;
 364
 365     if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
 366     current->wait = wait;
 367     wait->count   = count;
 368     wait->flags   = flags;
 369     wait->user    = NULL;
 370     wait->reply   = func;
 371     if (flags & SELECT_TIMEOUT)
 372     {
 373         wait->timeout.tv_sec = sec;
 374         wait->timeout.tv_usec = usec;
 375     }
 376
 377     for (i = 0, entry = wait->queues; i < count; i++, entry++)
 378     {
 379         struct object *obj = objects[i];
 380         entry->thread = current;
 381         if (!obj->ops->add_queue( obj, entry ))
 382         {
 383             wait->count = i;
 384             end_wait( current );
 385             return 0;
 386         }
 387     }
 388     return 1;
 389 }
 390
 391 /* check if the thread waiting condition is satisfied */
 392 static int check_wait( struct thread *thread, struct object **object )
 393 {
 394     int i, signaled;
 395     struct thread_wait *wait = thread->wait;
 396     struct wait_queue_entry *entry = wait->queues;
 397
 398     assert( wait );
 399     *object = NULL;
 400     if (wait->flags & SELECT_ALL)
 401     {
 402         int not_ok = 0;
 403         /* Note: we must check them all anyway, as some objects may
 404          * want to do something when signaled, even if others are not */
 405         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 406             not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
 407         if (not_ok) goto other_checks;
 408         /* Wait satisfied: tell it to all objects */
 409         signaled = 0;
 410         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 411             if (entry->obj->ops->satisfied( entry->obj, thread ))
 412                 signaled = STATUS_ABANDONED_WAIT_0;
 413         return signaled;
 414     }
 415     else
 416     {
 417         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 418         {
 419             if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
 420             /* Wait satisfied: tell it to the object */
 421             signaled = i;
 422             *object = entry->obj;
 423             if (entry->obj->ops->satisfied( entry->obj, thread ))
 424                 signaled = i + STATUS_ABANDONED_WAIT_0;
 425             return signaled;
 426         }
 427     }
 428
 429  other_checks:
 430     if ((wait->flags & SELECT_INTERRUPTIBLE) && thread->system_apc.head) return STATUS_USER_APC;
 431     if ((wait->flags & SELECT_ALERTABLE) && thread->user_apc.head) return STATUS_USER_APC;
 432     if (wait->flags & SELECT_TIMEOUT)
 433     {
 434         struct timeval now;
 435         gettimeofday( &now, NULL );
 436         if (!time_before( &now, &wait->timeout )) return STATUS_TIMEOUT;
 437     }
 438     return -1;
 439 }
 440
 441 /* build a reply to the select request */
 442 static void build_select_reply( struct thread *thread, struct object *obj, int signaled )
 443 {
 444     struct select_request *req = get_req_ptr( thread );
 445     req->signaled = signaled;
 446 }
 447
 448 /* attempt to wake up a thread */
 449 /* return 1 if OK, 0 if the wait condition is still not satisfied */
 450 static int wake_thread( struct thread *thread )
 451 {
 452     int signaled;
 453     struct object *object;
 454     if ((signaled = check_wait( thread, &object )) == -1) return 0;
 455     thread->error = 0;
 456     thread->wait->reply( thread, object, signaled );
 457     end_wait( thread );
 458     return 1;
 459 }
 460
 461 /* thread wait timeout */
 462 static void thread_timeout( void *ptr )
 463 {
 464     struct thread *thread = ptr;
 465     if (debug_level) fprintf( stderr, "%08x: *timeout*\n", (unsigned int)thread );
 466     assert( thread->wait );
 467     thread->error = 0;
 468     thread->wait->user = NULL;
 469     thread->wait->reply( thread, NULL, STATUS_TIMEOUT );
 470     end_wait( thread );
 471     send_reply( thread );
 472 }
 473
 474 /* sleep on a list of objects */
 475 int sleep_on( int count, struct object *objects[], int flags, int sec, int usec, sleep_reply func )
 476 {
 477     assert( !current->wait );
 478     if (!wait_on( count, objects, flags, sec, usec, func )) return 0;
 479     if (wake_thread( current )) return 1;
 480     /* now we need to wait */
 481     if (flags & SELECT_TIMEOUT)
 482     {
 483         if (!(current->wait->user = add_timeout_user( &current->wait->timeout,
 484                                                       thread_timeout, current )))
 485         {
 486             end_wait( current );
 487             return 0;
 488         }
 489     }
 490     return 1;
 491 }
 492
 493 /* select on a list of handles */
 494 static int select_on( int count, handle_t *handles, int flags, int sec, int usec )
 495 {
 496     int ret = 0;
 497     int i;
 498     struct object *objects[MAXIMUM_WAIT_OBJECTS];
 499
 500     if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
 501     {
 502         set_error( STATUS_INVALID_PARAMETER );
 503         return 0;
 504     }
 505     for (i = 0; i < count; i++)
 506     {
 507         if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
 508             break;
 509     }
 510     if (i == count) ret = sleep_on( count, objects, flags, sec, usec, build_select_reply );
 511     while (--i >= 0) release_object( objects[i] );
 512     return ret;
 513 }
 514
 515 /* attempt to wake threads sleeping on the object wait queue */
 516 void wake_up( struct object *obj, int max )
 517 {
 518     struct wait_queue_entry *entry = obj->head;
 519
 520     while (entry)
 521     {
 522         struct thread *thread = entry->thread;
 523         entry = entry->next;
 524         if (wake_thread( thread ))
 525         {
 526             send_reply( thread );
 527             if (max && !--max) break;
 528         }
 529     }
 530 }
 531
 532 /* queue an async procedure call */
 533 int thread_queue_apc( struct thread *thread, struct object *owner, void *func,
 534                       enum apc_type type, int system, int nb_args, ... )
 535 {
 536     struct thread_apc *apc;
 537     struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
 538
 539     /* cancel a possible previous APC with the same owner */
 540     if (owner) thread_cancel_apc( thread, owner, system );
 541
 542     if (!(apc = mem_alloc( sizeof(*apc) + (nb_args-1)*sizeof(apc->args[0]) ))) return 0;
 543     apc->prev    = queue->tail;
 544     apc->next    = NULL;
 545     apc->owner   = owner;
 546     apc->func    = func;
 547     apc->type    = type;
 548     apc->nb_args = nb_args;
 549     if (nb_args)
 550     {
 551         int i;
 552         va_list args;
 553         va_start( args, nb_args );
 554         for (i = 0; i < nb_args; i++) apc->args[i] = va_arg( args, void * );
 555         va_end( args );
 556     }
 557     queue->tail = apc;
 558     if (!apc->prev)  /* first one */
 559     {
 560         queue->head = apc;
 561         if (thread->wait && wake_thread( thread )) send_reply( thread );
 562     }
 563     return 1;
 564 }
 565
 566 /* cancel the async procedure call owned by a specific object */
 567 void thread_cancel_apc( struct thread *thread, struct object *owner, int system )
 568 {
 569     struct thread_apc *apc;
 570     struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
 571     for (apc = queue->head; apc; apc = apc->next)
 572     {
 573         if (apc->owner != owner) continue;
 574         if (apc->next) apc->next->prev = apc->prev;
 575         else queue->tail = apc->prev;
 576         if (apc->prev) apc->prev->next = apc->next;
 577         else queue->head = apc->next;
 578         free( apc );
 579         return;
 580     }
 581 }
 582
 583 /* remove the head apc from the queue; the returned pointer must be freed by the caller */
 584 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
 585 {
 586     struct thread_apc *apc;
 587     struct apc_queue *queue = &thread->system_apc;
 588
 589     if (!queue->head && !system_only) queue = &thread->user_apc;
 590     if ((apc = queue->head))
 591     {
 592         if (apc->next) apc->next->prev = NULL;
 593         else queue->tail = NULL;
 594         queue->head = apc->next;
 595     }
 596     return apc;
 597 }
 598
 599 /* retrieve an LDT selector entry */
 600 static void get_selector_entry( struct thread *thread, int entry,
 601                                 unsigned int *base, unsigned int *limit,
 602                                 unsigned char *flags )
 603 {
 604     if (!thread->process->ldt_copy)
 605     {
 606         set_error( STATUS_ACCESS_DENIED );
 607         return;
 608     }
 609     if (entry >= 8192)
 610     {
 611         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 612         return;
 613     }
 614     if (suspend_for_ptrace( thread ))
 615     {
 616         unsigned char flags_buf[4];
 617         int *addr = (int *)thread->process->ldt_copy + entry;
 618         if (read_thread_int( thread, addr, base ) == -1) goto done;
 619         if (read_thread_int( thread, addr + 8192, limit ) == -1) goto done;
 620         addr = (int *)thread->process->ldt_copy + 2*8192 + (entry >> 2);
 621         if (read_thread_int( thread, addr, (int *)flags_buf ) == -1) goto done;
 622         *flags = flags_buf[entry & 3];
 623     done:
 624         resume_thread( thread );
 625     }
 626 }
 627
 628 /* kill a thread on the spot */
 629 void kill_thread( struct thread *thread, int violent_death )
 630 {
 631     if (thread->state == TERMINATED) return;  /* already killed */
 632     thread->state = TERMINATED;
 633     if (current == thread) current = NULL;
 634     if (debug_level)
 635         fprintf( stderr,"%08x: *killed* exit_code=%d\n",
 636                  (unsigned int)thread, thread->exit_code );
 637     if (thread->wait)
 638     {
 639         end_wait( thread );
 640         /* if it is waiting on the socket, we don't need to send a SIGTERM */
 641         violent_death = 0;
 642     }
 643     debug_exit_thread( thread );
 644     abandon_mutexes( thread );
 645     remove_process_thread( thread->process, thread );
 646     wake_up( &thread->obj, 0 );
 647     detach_thread( thread, violent_death ? SIGTERM : 0 );
 648     remove_select_user( &thread->obj );
 649     release_object( thread->request_fd );
 650     close( thread->reply_fd );
 651     munmap( thread->buffer, MAX_REQUEST_LENGTH );
 652     thread->request_fd = NULL;
 653     thread->reply_fd = -1;
 654     thread->buffer = (void *)-1;
 655     release_object( thread );
 656 }
 657
 658 /* take a snapshot of currently running threads */
 659 struct thread_snapshot *thread_snap( int *count )
 660 {
 661     struct thread_snapshot *snapshot, *ptr;
 662     struct thread *thread;
 663     int total = 0;
 664
 665     for (thread = first_thread; thread; thread = thread->next)
 666         if (thread->state != TERMINATED) total++;
 667     if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
 668     ptr = snapshot;
 669     for (thread = first_thread; thread; thread = thread->next)
 670     {
 671         if (thread->state == TERMINATED) continue;
 672         ptr->thread   = thread;
 673         ptr->count    = thread->obj.refcount;
 674         ptr->priority = thread->priority;
 675         grab_object( thread );
 676         ptr++;
 677     }
 678     *count = total;
 679     return snapshot;
 680 }
 681
 682 /* signal that we are finished booting on the client side */
 683 DECL_HANDLER(boot_done)
 684 {
 685     debug_level = max( debug_level, req->debug_level );
 686     /* Make sure last_req is initialized */
 687     current->last_req = REQ_BOOT_DONE;
 688     if (current == booting_thread)
 689     {
 690         booting_thread = (struct thread *)~0UL;  /* make sure it doesn't match other threads */
 691         lock_master_socket(0);  /* allow other clients now */
 692     }
 693 }
 694
 695 /* create a new thread */
 696 DECL_HANDLER(new_thread)
 697 {
 698     struct thread *thread;
 699     int sock[2];
 700
 701     if (socketpair( AF_UNIX, SOCK_STREAM, 0, sock ) != -1)
 702     {
 703         if ((thread = create_thread( sock[0], current->process )))
 704         {
 705             if (req->suspend) thread->suspend++;
 706             req->tid = thread;
 707             if ((req->handle = alloc_handle( current->process, thread,
 708                                              THREAD_ALL_ACCESS, req->inherit )))
 709             {
 710                 send_client_fd( current, sock[1], req->handle );
 711                 close( sock[1] );
 712                 /* thread object will be released when the thread gets killed */
 713                 return;
 714             }
 715             kill_thread( thread, 1 );
 716         }
 717         close( sock[1] );
 718     }
 719     else file_set_error();
 720 }
 721
 722 /* retrieve the thread buffer file descriptor */
 723 DECL_HANDLER(get_thread_buffer)
 724 {
 725     fatal_protocol_error( current, "get_thread_buffer: should never get called directly\n" );
 726 }
 727
 728 /* initialize a new thread */
 729 DECL_HANDLER(init_thread)
 730 {
 731     if (current->unix_pid)
 732     {
 733         fatal_protocol_error( current, "init_thread: already running\n" );
 734         return;
 735     }
 736     current->unix_pid = req->unix_pid;
 737     current->teb      = req->teb;
 738     if (current->suspend + current->process->suspend > 0) stop_thread( current );
 739     if (current->process->running_threads > 1)
 740         generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
 741 }
 742
 743 /* terminate a thread */
 744 DECL_HANDLER(terminate_thread)
 745 {
 746     struct thread *thread;
 747
 748     req->self = 0;
 749     req->last = 0;
 750     if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
 751     {
 752         thread->exit_code = req->exit_code;
 753         if (thread != current) kill_thread( thread, 1 );
 754         else
 755         {
 756             req->self = 1;
 757             req->last = (thread->process->running_threads == 1);
 758         }
 759         release_object( thread );
 760     }
 761 }
 762
 763 /* fetch information about a thread */
 764 DECL_HANDLER(get_thread_info)
 765 {
 766     struct thread *thread;
 767     handle_t handle = req->handle;
 768
 769     if (!handle) thread = get_thread_from_id( req->tid_in );
 770     else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
 771
 772     if (thread)
 773     {
 774         req->tid       = get_thread_id( thread );
 775         req->teb       = thread->teb;
 776         req->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
 777         req->priority  = thread->priority;
 778         release_object( thread );
 779     }
 780 }
 781
 782 /* set information about a thread */
 783 DECL_HANDLER(set_thread_info)
 784 {
 785     struct thread *thread;
 786
 787     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
 788     {
 789         set_thread_info( thread, req );
 790         release_object( thread );
 791     }
 792 }
 793
 794 /* suspend a thread */
 795 DECL_HANDLER(suspend_thread)
 796 {
 797     struct thread *thread;
 798
 799     if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
 800     {
 801         req->count = suspend_thread( thread, 1 );
 802         release_object( thread );
 803     }
 804 }
 805
 806 /* resume a thread */
 807 DECL_HANDLER(resume_thread)
 808 {
 809     struct thread *thread;
 810
 811     if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
 812     {
 813         req->count = resume_thread( thread );
 814         release_object( thread );
 815     }
 816 }
 817
 818 /* select on a handle list */
 819 DECL_HANDLER(select)
 820 {
 821     int count = get_req_data_size(req) / sizeof(int);
 822     if (!select_on( count, get_req_data(req), req->flags, req->sec, req->usec ))
 823         req->signaled = -1;
 824 }
 825
 826 /* queue an APC for a thread */
 827 DECL_HANDLER(queue_apc)
 828 {
 829     struct thread *thread;
 830     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
 831     {
 832         thread_queue_apc( thread, NULL, req->func, APC_USER, !req->user, 1, req->param );
 833         release_object( thread );
 834     }
 835 }
 836
 837 /* get next APC to call */
 838 DECL_HANDLER(get_apc)
 839 {
 840     struct thread_apc *apc;
 841     size_t size;
 842
 843     for (;;)
 844     {
 845         if (!(apc = thread_dequeue_apc( current, !req->alertable )))
 846         {
 847             /* no more APCs */
 848             req->func    = NULL;
 849             req->type    = APC_NONE;
 850             set_req_data_size( req, 0 );
 851             return;
 852         }
 853         /* Optimization: ignore APCs that have a NULL func; they are only used
 854          * to wake up a thread, but since we got here the thread woke up already.
 855          */
 856         if (apc->func) break;
 857         free( apc );
 858     }
 859     size = apc->nb_args * sizeof(apc->args[0]);
 860     if (size > get_req_data_size(req)) size = get_req_data_size(req);
 861     req->func = apc->func;
 862     req->type = apc->type;
 863     memcpy( get_req_data(req), apc->args, size );
 864     set_req_data_size( req, size );
 865     free( apc );
 866 }
 867
 868 /* fetch a selector entry for a thread */
 869 DECL_HANDLER(get_selector_entry)
 870 {
 871     struct thread *thread;
 872     if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
 873     {
 874         get_selector_entry( thread, req->entry, &req->base, &req->limit, &req->flags );
 875         release_object( thread );
 876     }
 877 }