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 <errno.h>
  11 #include <fcntl.h>
  12 #include <signal.h>
  13 #include <stdarg.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <sys/types.h>
  18 #include <unistd.h>
  19 #include <stdarg.h>
  20
  21 #include "winbase.h"
  22
  23 #include "handle.h"
  24 #include "process.h"
  25 #include "thread.h"
  26 #include "request.h"
  27 #include "user.h"
  28
  29
  30 /* thread queues */
  31
  32 struct thread_wait
  33 {
  34     struct thread_wait     *next;       /* next wait structure for this thread */
  35     struct thread          *thread;     /* owner thread */
  36     int                     count;      /* count of objects */
  37     int                     flags;
  38     void                   *cookie;     /* magic cookie to return to client */
  39     struct timeval          timeout;
  40     struct timeout_user    *user;
  41     struct wait_queue_entry queues[1];
  42 };
  43
  44 /* asynchronous procedure calls */
  45
  46 struct thread_apc
  47 {
  48     struct thread_apc  *next;     /* queue linked list */
  49     struct thread_apc  *prev;
  50     struct object      *owner;    /* object that queued this apc */
  51     void               *func;     /* function to call in client */
  52     enum apc_type       type;     /* type of apc function */
  53     int                 nb_args;  /* number of arguments */
  54     void               *args[1];  /* function arguments */
  55 };
  56
  57
  58 /* thread operations */
  59
  60 static void dump_thread( struct object *obj, int verbose );
  61 static int thread_signaled( struct object *obj, struct thread *thread );
  62 static void thread_poll_event( struct object *obj, int event );
  63 static void destroy_thread( struct object *obj );
  64 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only );
  65
  66 static const struct object_ops thread_ops =
  67 {
  68     sizeof(struct thread),      /* size */
  69     dump_thread,                /* dump */
  70     add_queue,                  /* add_queue */
  71     remove_queue,               /* remove_queue */
  72     thread_signaled,            /* signaled */
  73     no_satisfied,               /* satisfied */
  74     NULL,                       /* get_poll_events */
  75     thread_poll_event,          /* poll_event */
  76     no_get_fd,                  /* get_fd */
  77     no_flush,                   /* flush */
  78     no_get_file_info,           /* get_file_info */
  79     destroy_thread              /* destroy */
  80 };
  81
  82 static struct thread *first_thread;
  83 static struct thread *booting_thread;
  84
  85 /* initialize the structure for a newly allocated thread */
  86 inline static void init_thread_structure( struct thread *thread )
  87 {
  88     int i;
  89
  90     thread->unix_pid        = 0;  /* not known yet */
  91     thread->context         = NULL;
  92     thread->teb             = NULL;
  93     thread->mutex           = NULL;
  94     thread->debug_ctx       = NULL;
  95     thread->debug_event     = NULL;
  96     thread->queue           = NULL;
  97     thread->info            = NULL;
  98     thread->wait            = NULL;
  99     thread->system_apc.head = NULL;
 100     thread->system_apc.tail = NULL;
 101     thread->user_apc.head   = NULL;
 102     thread->user_apc.tail   = NULL;
 103     thread->error           = 0;
 104     thread->req_data        = NULL;
 105     thread->req_toread      = 0;
 106     thread->reply_data      = NULL;
 107     thread->reply_towrite   = 0;
 108     thread->reply_fd        = -1;
 109     thread->wait_fd         = -1;
 110     thread->state           = RUNNING;
 111     thread->attached        = 0;
 112     thread->exit_code       = 0;
 113     thread->next            = NULL;
 114     thread->prev            = NULL;
 115     thread->priority        = THREAD_PRIORITY_NORMAL;
 116     thread->affinity        = 1;
 117     thread->suspend         = 0;
 118
 119     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 120         thread->inflight[i].server = thread->inflight[i].client = -1;
 121 }
 122
 123 /* create a new thread */
 124 struct thread *create_thread( int fd, struct process *process )
 125 {
 126     struct thread *thread;
 127
 128     if (!(thread = alloc_object( &thread_ops, fd ))) return NULL;
 129
 130     init_thread_structure( thread );
 131
 132     thread->process = (struct process *)grab_object( process );
 133     thread->request_fd = fd;
 134     if (!current) current = thread;
 135
 136     if (!booting_thread)  /* first thread ever */
 137     {
 138         booting_thread = thread;
 139         lock_master_socket(1);
 140     }
 141
 142     if ((thread->next = first_thread) != NULL) thread->next->prev = thread;
 143     first_thread = thread;
 144
 145     set_select_events( &thread->obj, POLLIN );  /* start listening to events */
 146     add_process_thread( thread->process, thread );
 147     return thread;
 148 }
 149
 150 /* handle a client event */
 151 static void thread_poll_event( struct object *obj, int event )
 152 {
 153     struct thread *thread = (struct thread *)obj;
 154     assert( obj->ops == &thread_ops );
 155
 156     if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
 157     else if (event & POLLIN) read_request( thread );
 158     else if (event & POLLOUT) write_reply( thread );
 159 }
 160
 161 /* cleanup everything that is no longer needed by a dead thread */
 162 /* used by destroy_thread and kill_thread */
 163 static void cleanup_thread( struct thread *thread )
 164 {
 165     int i;
 166     struct thread_apc *apc;
 167
 168     while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
 169     if (thread->req_data) free( thread->req_data );
 170     if (thread->reply_data) free( thread->reply_data );
 171     if (thread->request_fd != -1) close( thread->request_fd );
 172     if (thread->reply_fd != -1) close( thread->reply_fd );
 173     if (thread->wait_fd != -1) close( thread->wait_fd );
 174     if (thread->queue)
 175     {
 176         if (thread->process->queue == thread->queue)
 177         {
 178             release_object( thread->process->queue );
 179             thread->process->queue = NULL;
 180         }
 181         release_object( thread->queue );
 182         thread->queue = NULL;
 183     }
 184     destroy_thread_windows( thread );
 185     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 186     {
 187         if (thread->inflight[i].client != -1)
 188         {
 189             close( thread->inflight[i].server );
 190             thread->inflight[i].client = thread->inflight[i].server = -1;
 191         }
 192     }
 193     thread->req_data = NULL;
 194     thread->reply_data = NULL;
 195     thread->request_fd = -1;
 196     thread->reply_fd = -1;
 197     thread->wait_fd = -1;
 198 }
 199
 200 /* destroy a thread when its refcount is 0 */
 201 static void destroy_thread( struct object *obj )
 202 {
 203     struct thread_apc *apc;
 204     struct thread *thread = (struct thread *)obj;
 205     assert( obj->ops == &thread_ops );
 206
 207     assert( !thread->debug_ctx );  /* cannot still be debugging something */
 208     if (thread->next) thread->next->prev = thread->prev;
 209     if (thread->prev) thread->prev->next = thread->next;
 210     else first_thread = thread->next;
 211     while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
 212     if (thread->info) release_object( thread->info );
 213     cleanup_thread( thread );
 214     release_object( thread->process );
 215 }
 216
 217 /* dump a thread on stdout for debugging purposes */
 218 static void dump_thread( struct object *obj, int verbose )
 219 {
 220     struct thread *thread = (struct thread *)obj;
 221     assert( obj->ops == &thread_ops );
 222
 223     fprintf( stderr, "Thread pid=%d teb=%p state=%d\n",
 224              thread->unix_pid, thread->teb, thread->state );
 225 }
 226
 227 static int thread_signaled( struct object *obj, struct thread *thread )
 228 {
 229     struct thread *mythread = (struct thread *)obj;
 230     return (mythread->state == TERMINATED);
 231 }
 232
 233 /* get a thread pointer from a thread id (and increment the refcount) */
 234 struct thread *get_thread_from_id( void *id )
 235 {
 236     struct thread *t = first_thread;
 237     while (t && (t != id)) t = t->next;
 238     if (t) grab_object( t );
 239     else set_error( STATUS_INVALID_PARAMETER );
 240     return t;
 241 }
 242
 243 /* get a thread from a handle (and increment the refcount) */
 244 struct thread *get_thread_from_handle( handle_t handle, unsigned int access )
 245 {
 246     return (struct thread *)get_handle_obj( current->process, handle,
 247                                             access, &thread_ops );
 248 }
 249
 250 /* find a thread from a Unix pid */
 251 struct thread *get_thread_from_pid( int pid )
 252 {
 253     struct thread *t = first_thread;
 254     while (t && (t->unix_pid != pid)) t = t->next;
 255     return t;
 256 }
 257
 258 /* set all information about a thread */
 259 static void set_thread_info( struct thread *thread,
 260                              const struct set_thread_info_request *req )
 261 {
 262     if (req->mask & SET_THREAD_INFO_PRIORITY)
 263         thread->priority = req->priority;
 264     if (req->mask & SET_THREAD_INFO_AFFINITY)
 265     {
 266         if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
 267         else thread->affinity = req->affinity;
 268     }
 269 }
 270
 271 /* suspend a thread */
 272 int suspend_thread( struct thread *thread, int check_limit )
 273 {
 274     int old_count = thread->suspend;
 275     if (thread->suspend < MAXIMUM_SUSPEND_COUNT || !check_limit)
 276     {
 277         if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
 278     }
 279     else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
 280     return old_count;
 281 }
 282
 283 /* resume a thread */
 284 int resume_thread( struct thread *thread )
 285 {
 286     int old_count = thread->suspend;
 287     if (thread->suspend > 0)
 288     {
 289         if (!(--thread->suspend + thread->process->suspend)) continue_thread( thread );
 290     }
 291     return old_count;
 292 }
 293
 294 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
 295 int add_queue( struct object *obj, struct wait_queue_entry *entry )
 296 {
 297     grab_object( obj );
 298     entry->obj    = obj;
 299     entry->prev   = obj->tail;
 300     entry->next   = NULL;
 301     if (obj->tail) obj->tail->next = entry;
 302     else obj->head = entry;
 303     obj->tail = entry;
 304     return 1;
 305 }
 306
 307 /* remove a thread from an object wait queue */
 308 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
 309 {
 310     if (entry->next) entry->next->prev = entry->prev;
 311     else obj->tail = entry->prev;
 312     if (entry->prev) entry->prev->next = entry->next;
 313     else obj->head = entry->next;
 314     release_object( obj );
 315 }
 316
 317 /* finish waiting */
 318 static void end_wait( struct thread *thread )
 319 {
 320     struct thread_wait *wait = thread->wait;
 321     struct wait_queue_entry *entry;
 322     int i;
 323
 324     assert( wait );
 325     for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 326         entry->obj->ops->remove_queue( entry->obj, entry );
 327     if (wait->user) remove_timeout_user( wait->user );
 328     thread->wait = wait->next;
 329     free( wait );
 330 }
 331
 332 /* build the thread wait structure */
 333 static int wait_on( int count, struct object *objects[], int flags, int sec, int usec )
 334 {
 335     struct thread_wait *wait;
 336     struct wait_queue_entry *entry;
 337     int i;
 338
 339     if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
 340     wait->next    = current->wait;
 341     wait->thread  = current;
 342     wait->count   = count;
 343     wait->flags   = flags;
 344     wait->user    = NULL;
 345     current->wait = wait;
 346     if (flags & SELECT_TIMEOUT)
 347     {
 348         wait->timeout.tv_sec = sec;
 349         wait->timeout.tv_usec = usec;
 350     }
 351
 352     for (i = 0, entry = wait->queues; i < count; i++, entry++)
 353     {
 354         struct object *obj = objects[i];
 355         entry->thread = current;
 356         if (!obj->ops->add_queue( obj, entry ))
 357         {
 358             wait->count = i;
 359             end_wait( current );
 360             return 0;
 361         }
 362     }
 363     return 1;
 364 }
 365
 366 /* check if the thread waiting condition is satisfied */
 367 static int check_wait( struct thread *thread )
 368 {
 369     int i, signaled;
 370     struct thread_wait *wait = thread->wait;
 371     struct wait_queue_entry *entry = wait->queues;
 372
 373     assert( wait );
 374     if (wait->flags & SELECT_ALL)
 375     {
 376         int not_ok = 0;
 377         /* Note: we must check them all anyway, as some objects may
 378          * want to do something when signaled, even if others are not */
 379         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 380             not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
 381         if (not_ok) goto other_checks;
 382         /* Wait satisfied: tell it to all objects */
 383         signaled = 0;
 384         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 385             if (entry->obj->ops->satisfied( entry->obj, thread ))
 386                 signaled = STATUS_ABANDONED_WAIT_0;
 387         return signaled;
 388     }
 389     else
 390     {
 391         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 392         {
 393             if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
 394             /* Wait satisfied: tell it to the object */
 395             signaled = i;
 396             if (entry->obj->ops->satisfied( entry->obj, thread ))
 397                 signaled = i + STATUS_ABANDONED_WAIT_0;
 398             return signaled;
 399         }
 400     }
 401
 402  other_checks:
 403     if ((wait->flags & SELECT_INTERRUPTIBLE) && thread->system_apc.head) return STATUS_USER_APC;
 404     if ((wait->flags & SELECT_ALERTABLE) && thread->user_apc.head) return STATUS_USER_APC;
 405     if (wait->flags & SELECT_TIMEOUT)
 406     {
 407         struct timeval now;
 408         gettimeofday( &now, NULL );
 409         if (!time_before( &now, &wait->timeout )) return STATUS_TIMEOUT;
 410     }
 411     return -1;
 412 }
 413
 414 /* send the wakeup signal to a thread */
 415 static int send_thread_wakeup( struct thread *thread, void *cookie, int signaled )
 416 {
 417     struct wake_up_reply reply;
 418     int ret;
 419
 420     reply.cookie   = cookie;
 421     reply.signaled = signaled;
 422     if ((ret = write( thread->wait_fd, &reply, sizeof(reply) )) == sizeof(reply)) return 0;
 423     if (ret >= 0)
 424         fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
 425     else if (errno == EPIPE)
 426         kill_thread( thread, 0 );  /* normal death */
 427     else
 428         fatal_protocol_perror( thread, "write" );
 429     return -1;
 430 }
 431
 432 /* attempt to wake up a thread */
 433 /* return >0 if OK, 0 if the wait condition is still not satisfied */
 434 static int wake_thread( struct thread *thread )
 435 {
 436     int signaled, count;
 437     void *cookie;
 438
 439     for (count = 0; thread->wait; count++)
 440     {
 441         if ((signaled = check_wait( thread )) == -1) break;
 442
 443         cookie = thread->wait->cookie;
 444         if (debug_level) fprintf( stderr, "%08x: *wakeup* signaled=%d cookie=%p\n",
 445                                   (unsigned int)thread, signaled, cookie );
 446         end_wait( thread );
 447         if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
 448             break;
 449     }
 450     return count;
 451 }
 452
 453 /* thread wait timeout */
 454 static void thread_timeout( void *ptr )
 455 {
 456     struct thread_wait *wait = ptr;
 457     struct thread *thread = wait->thread;
 458     void *cookie = wait->cookie;
 459
 460     wait->user = NULL;
 461     if (thread->wait != wait) return; /* not the top-level wait, ignore it */
 462
 463     if (debug_level) fprintf( stderr, "%08x: *wakeup* signaled=%d cookie=%p\n",
 464                               (unsigned int)thread, STATUS_TIMEOUT, cookie );
 465     end_wait( thread );
 466     send_thread_wakeup( thread, cookie, STATUS_TIMEOUT );
 467     /* check if other objects have become signaled in the meantime */
 468     wake_thread( thread );
 469 }
 470
 471 /* select on a list of handles */
 472 static void select_on( int count, void *cookie, const handle_t *handles,
 473                        int flags, int sec, int usec )
 474 {
 475     int ret, i;
 476     struct object *objects[MAXIMUM_WAIT_OBJECTS];
 477
 478     if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
 479     {
 480         set_error( STATUS_INVALID_PARAMETER );
 481         return;
 482     }
 483     for (i = 0; i < count; i++)
 484     {
 485         if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
 486             break;
 487     }
 488
 489     if (i < count) goto done;
 490     if (!wait_on( count, objects, flags, sec, usec )) goto done;
 491
 492     if ((ret = check_wait( current )) != -1)
 493     {
 494         /* condition is already satisfied */
 495         end_wait( current );
 496         set_error( ret );
 497         goto done;
 498     }
 499
 500     /* now we need to wait */
 501     if (flags & SELECT_TIMEOUT)
 502     {
 503         if (!(current->wait->user = add_timeout_user( &current->wait->timeout,
 504                                                       thread_timeout, current->wait )))
 505         {
 506             end_wait( current );
 507             goto done;
 508         }
 509     }
 510     current->wait->cookie = cookie;
 511     set_error( STATUS_PENDING );
 512
 513 done:
 514     while (--i >= 0) release_object( objects[i] );
 515 }
 516
 517 /* attempt to wake threads sleeping on the object wait queue */
 518 void wake_up( struct object *obj, int max )
 519 {
 520     struct wait_queue_entry *entry = obj->head;
 521
 522     while (entry)
 523     {
 524         struct thread *thread = entry->thread;
 525         entry = entry->next;
 526         if (wake_thread( thread ))
 527         {
 528             if (max && !--max) break;
 529         }
 530     }
 531 }
 532
 533 /* queue an async procedure call */
 534 int thread_queue_apc( struct thread *thread, struct object *owner, void *func,
 535                       enum apc_type type, int system, int nb_args, ... )
 536 {
 537     struct thread_apc *apc;
 538     struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
 539
 540     /* cancel a possible previous APC with the same owner */
 541     if (owner) thread_cancel_apc( thread, owner, system );
 542
 543     if (!(apc = mem_alloc( sizeof(*apc) + (nb_args-1)*sizeof(apc->args[0]) ))) return 0;
 544     apc->prev    = queue->tail;
 545     apc->next    = NULL;
 546     apc->owner   = owner;
 547     apc->func    = func;
 548     apc->type    = type;
 549     apc->nb_args = nb_args;
 550     if (nb_args)
 551     {
 552         int i;
 553         va_list args;
 554         va_start( args, nb_args );
 555         for (i = 0; i < nb_args; i++) apc->args[i] = va_arg( args, void * );
 556         va_end( args );
 557     }
 558     queue->tail = apc;
 559     if (!apc->prev)  /* first one */
 560     {
 561         queue->head = apc;
 562         wake_thread( thread );
 563     }
 564     return 1;
 565 }
 566
 567 /* cancel the async procedure call owned by a specific object */
 568 void thread_cancel_apc( struct thread *thread, struct object *owner, int system )
 569 {
 570     struct thread_apc *apc;
 571     struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
 572     for (apc = queue->head; apc; apc = apc->next)
 573     {
 574         if (apc->owner != owner) continue;
 575         if (apc->next) apc->next->prev = apc->prev;
 576         else queue->tail = apc->prev;
 577         if (apc->prev) apc->prev->next = apc->next;
 578         else queue->head = apc->next;
 579         free( apc );
 580         return;
 581     }
 582 }
 583
 584 /* remove the head apc from the queue; the returned pointer must be freed by the caller */
 585 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
 586 {
 587     struct thread_apc *apc;
 588     struct apc_queue *queue = &thread->system_apc;
 589
 590     if (!queue->head && !system_only) queue = &thread->user_apc;
 591     if ((apc = queue->head))
 592     {
 593         if (apc->next) apc->next->prev = NULL;
 594         else queue->tail = NULL;
 595         queue->head = apc->next;
 596     }
 597     return apc;
 598 }
 599
 600 /* add an fd to the inflight list */
 601 /* return list index, or -1 on error */
 602 int thread_add_inflight_fd( struct thread *thread, int client, int server )
 603 {
 604     int i;
 605
 606     if (server == -1) return -1;
 607     if (client == -1)
 608     {
 609         close( server );
 610         return -1;
 611     }
 612
 613     /* first check if we already have an entry for this fd */
 614     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 615         if (thread->inflight[i].client == client)
 616         {
 617             close( thread->inflight[i].server );
 618             thread->inflight[i].server = server;
 619             return i;
 620         }
 621
 622     /* now find a free spot to store it */
 623     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 624         if (thread->inflight[i].client == -1)
 625         {
 626             thread->inflight[i].client = client;
 627             thread->inflight[i].server = server;
 628             return i;
 629         }
 630     return -1;
 631 }
 632
 633 /* get an inflight fd and purge it from the list */
 634 /* the fd must be closed when no longer used */
 635 int thread_get_inflight_fd( struct thread *thread, int client )
 636 {
 637     int i, ret;
 638
 639     if (client == -1) return -1;
 640
 641     do
 642     {
 643         for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 644         {
 645             if (thread->inflight[i].client == client)
 646             {
 647                 ret = thread->inflight[i].server;
 648                 thread->inflight[i].server = thread->inflight[i].client = -1;
 649                 return ret;
 650             }
 651         }
 652     } while (!receive_fd( thread->process ));  /* in case it is still in the socket buffer */
 653     return -1;
 654 }
 655
 656 /* retrieve an LDT selector entry */
 657 static void get_selector_entry( struct thread *thread, int entry,
 658                                 unsigned int *base, unsigned int *limit,
 659                                 unsigned char *flags )
 660 {
 661     if (!thread->process->ldt_copy)
 662     {
 663         set_error( STATUS_ACCESS_DENIED );
 664         return;
 665     }
 666     if (entry >= 8192)
 667     {
 668         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 669         return;
 670     }
 671     if (suspend_for_ptrace( thread ))
 672     {
 673         unsigned char flags_buf[4];
 674         int *addr = (int *)thread->process->ldt_copy + entry;
 675         if (read_thread_int( thread, addr, base ) == -1) goto done;
 676         if (read_thread_int( thread, addr + 8192, limit ) == -1) goto done;
 677         addr = (int *)thread->process->ldt_copy + 2*8192 + (entry >> 2);
 678         if (read_thread_int( thread, addr, (int *)flags_buf ) == -1) goto done;
 679         *flags = flags_buf[entry & 3];
 680     done:
 681         resume_thread( thread );
 682     }
 683 }
 684
 685 /* kill a thread on the spot */
 686 void kill_thread( struct thread *thread, int violent_death )
 687 {
 688     if (thread->state == TERMINATED) return;  /* already killed */
 689     thread->state = TERMINATED;
 690     if (current == thread) current = NULL;
 691     if (debug_level)
 692         fprintf( stderr,"%08x: *killed* exit_code=%d\n",
 693                  (unsigned int)thread, thread->exit_code );
 694     if (thread->wait)
 695     {
 696         while (thread->wait) end_wait( thread );
 697         send_thread_wakeup( thread, NULL, STATUS_PENDING );
 698         /* if it is waiting on the socket, we don't need to send a SIGTERM */
 699         violent_death = 0;
 700     }
 701     kill_console_processes( thread, 0 );
 702     debug_exit_thread( thread );
 703     abandon_mutexes( thread );
 704     remove_process_thread( thread->process, thread );
 705     wake_up( &thread->obj, 0 );
 706     detach_thread( thread, violent_death ? SIGTERM : 0 );
 707     if (thread->request_fd == thread->obj.fd) thread->request_fd = -1;
 708     if (thread->reply_fd == thread->obj.fd) thread->reply_fd = -1;
 709     remove_select_user( &thread->obj );
 710     cleanup_thread( thread );
 711     release_object( thread );
 712 }
 713
 714 /* take a snapshot of currently running threads */
 715 struct thread_snapshot *thread_snap( int *count )
 716 {
 717     struct thread_snapshot *snapshot, *ptr;
 718     struct thread *thread;
 719     int total = 0;
 720
 721     for (thread = first_thread; thread; thread = thread->next)
 722         if (thread->state != TERMINATED) total++;
 723     if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
 724     ptr = snapshot;
 725     for (thread = first_thread; thread; thread = thread->next)
 726     {
 727         if (thread->state == TERMINATED) continue;
 728         ptr->thread   = thread;
 729         ptr->count    = thread->obj.refcount;
 730         ptr->priority = thread->priority;
 731         grab_object( thread );
 732         ptr++;
 733     }
 734     *count = total;
 735     return snapshot;
 736 }
 737
 738 /* signal that we are finished booting on the client side */
 739 DECL_HANDLER(boot_done)
 740 {
 741     debug_level = max( debug_level, req->debug_level );
 742     if (current == booting_thread)
 743     {
 744         booting_thread = (struct thread *)~0UL;  /* make sure it doesn't match other threads */
 745         lock_master_socket(0);  /* allow other clients now */
 746     }
 747 }
 748
 749 /* create a new thread */
 750 DECL_HANDLER(new_thread)
 751 {
 752     struct thread *thread;
 753     int request_fd = thread_get_inflight_fd( current, req->request_fd );
 754
 755     if (request_fd == -1 || fcntl( request_fd, F_SETFL, O_NONBLOCK ) == -1)
 756     {
 757         if (request_fd != -1) close( request_fd );
 758         set_error( STATUS_INVALID_HANDLE );
 759         return;
 760     }
 761
 762     if ((thread = create_thread( request_fd, current->process )))
 763     {
 764         if (req->suspend) thread->suspend++;
 765         reply->tid = thread;
 766         if ((reply->handle = alloc_handle( current->process, thread,
 767                                            THREAD_ALL_ACCESS, req->inherit )))
 768         {
 769             /* thread object will be released when the thread gets killed */
 770             return;
 771         }
 772         kill_thread( thread, 1 );
 773         request_fd = -1;
 774     }
 775 }
 776
 777 /* initialize a new thread */
 778 DECL_HANDLER(init_thread)
 779 {
 780     int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
 781     int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
 782
 783     if (current->unix_pid)
 784     {
 785         fatal_protocol_error( current, "init_thread: already running\n" );
 786         goto error;
 787     }
 788     if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1)
 789     {
 790         fatal_protocol_error( current, "bad reply fd\n" );
 791         goto error;
 792     }
 793     if (wait_fd == -1)
 794     {
 795         fatal_protocol_error( current, "bad wait fd\n" );
 796         goto error;
 797     }
 798
 799     current->unix_pid = req->unix_pid;
 800     current->teb      = req->teb;
 801     current->reply_fd = reply_fd;
 802     current->wait_fd  = wait_fd;
 803
 804     if (current->suspend + current->process->suspend > 0) stop_thread( current );
 805     if (current->process->running_threads > 1)
 806         generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
 807
 808     reply->pid     = get_process_id( current->process );
 809     reply->tid     = get_thread_id( current );
 810     reply->boot    = (current == booting_thread);
 811     reply->version = SERVER_PROTOCOL_VERSION;
 812     return;
 813
 814  error:
 815     if (reply_fd != -1) close( reply_fd );
 816     if (wait_fd != -1) close( wait_fd );
 817 }
 818
 819 /* terminate a thread */
 820 DECL_HANDLER(terminate_thread)
 821 {
 822     struct thread *thread;
 823
 824     reply->self = 0;
 825     reply->last = 0;
 826     if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
 827     {
 828         thread->exit_code = req->exit_code;
 829         if (thread != current) kill_thread( thread, 1 );
 830         else
 831         {
 832             reply->self = 1;
 833             reply->last = (thread->process->running_threads == 1);
 834         }
 835         release_object( thread );
 836     }
 837 }
 838
 839 /* fetch information about a thread */
 840 DECL_HANDLER(get_thread_info)
 841 {
 842     struct thread *thread;
 843     handle_t handle = req->handle;
 844
 845     if (!handle) thread = get_thread_from_id( req->tid_in );
 846     else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
 847
 848     if (thread)
 849     {
 850         reply->tid       = get_thread_id( thread );
 851         reply->teb       = thread->teb;
 852         reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
 853         reply->priority  = thread->priority;
 854         release_object( thread );
 855     }
 856 }
 857
 858 /* set information about a thread */
 859 DECL_HANDLER(set_thread_info)
 860 {
 861     struct thread *thread;
 862
 863     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
 864     {
 865         set_thread_info( thread, req );
 866         release_object( thread );
 867     }
 868 }
 869
 870 /* suspend a thread */
 871 DECL_HANDLER(suspend_thread)
 872 {
 873     struct thread *thread;
 874
 875     if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
 876     {
 877         reply->count = suspend_thread( thread, 1 );
 878         release_object( thread );
 879     }
 880 }
 881
 882 /* resume a thread */
 883 DECL_HANDLER(resume_thread)
 884 {
 885     struct thread *thread;
 886
 887     if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
 888     {
 889         reply->count = resume_thread( thread );
 890         release_object( thread );
 891     }
 892 }
 893
 894 /* select on a handle list */
 895 DECL_HANDLER(select)
 896 {
 897     int count = get_req_data_size() / sizeof(int);
 898     select_on( count, req->cookie, get_req_data(), req->flags, req->sec, req->usec );
 899 }
 900
 901 /* queue an APC for a thread */
 902 DECL_HANDLER(queue_apc)
 903 {
 904     struct thread *thread;
 905     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
 906     {
 907         thread_queue_apc( thread, NULL, req->func, APC_USER, !req->user, 1, req->param );
 908         release_object( thread );
 909     }
 910 }
 911
 912 /* get next APC to call */
 913 DECL_HANDLER(get_apc)
 914 {
 915     struct thread_apc *apc;
 916     size_t size;
 917
 918     for (;;)
 919     {
 920         if (!(apc = thread_dequeue_apc( current, !req->alertable )))
 921         {
 922             /* no more APCs */
 923             reply->func = NULL;
 924             reply->type = APC_NONE;
 925             return;
 926         }
 927         /* Optimization: ignore APCs that have a NULL func; they are only used
 928          * to wake up a thread, but since we got here the thread woke up already.
 929          */
 930         if (apc->func) break;
 931         free( apc );
 932     }
 933     size = apc->nb_args * sizeof(apc->args[0]);
 934     if (size > get_reply_max_size()) size = get_reply_max_size();
 935     reply->func = apc->func;
 936     reply->type = apc->type;
 937     set_reply_data( apc->args, size );
 938     free( apc );
 939 }
 940
 941 /* fetch a selector entry for a thread */
 942 DECL_HANDLER(get_selector_entry)
 943 {
 944     struct thread *thread;
 945     if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
 946     {
 947         get_selector_entry( thread, req->entry, &reply->base, &reply->limit, &reply->flags );
 948         release_object( thread );
 949     }
 950 }