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 #ifdef HAVE_SYS_MMAN_H
  18 #include <sys/mman.h>
  19 #endif
  20 #include <sys/types.h>
  21 #include <unistd.h>
  22 #include <stdarg.h>
  23
  24 #include "winbase.h"
  25
  26 #include "handle.h"
  27 #include "process.h"
  28 #include "thread.h"
  29 #include "request.h"
  30 #include "user.h"
  31
  32
  33 /* thread queues */
  34
  35 struct thread_wait
  36 {
  37     struct thread_wait     *next;       /* next wait structure for this thread */
  38     struct thread          *thread;     /* owner thread */
  39     int                     count;      /* count of objects */
  40     int                     flags;
  41     void                   *cookie;     /* magic cookie to return to client */
  42     struct timeval          timeout;
  43     struct timeout_user    *user;
  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 static 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 /* initialize the structure for a newly allocated thread */
  89 inline static void init_thread_structure( struct thread *thread )
  90 {
  91     int i;
  92
  93     thread->unix_pid        = 0;  /* not known yet */
  94     thread->context         = NULL;
  95     thread->teb             = NULL;
  96     thread->mutex           = NULL;
  97     thread->debug_ctx       = NULL;
  98     thread->debug_event     = NULL;
  99     thread->queue           = NULL;
 100     thread->info            = NULL;
 101     thread->wait            = NULL;
 102     thread->system_apc.head = NULL;
 103     thread->system_apc.tail = NULL;
 104     thread->user_apc.head   = NULL;
 105     thread->user_apc.tail   = NULL;
 106     thread->error           = 0;
 107     thread->request_fd      = NULL;
 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     thread->buffer          = (void *)-1;
 119
 120     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 121         thread->inflight[i].server = thread->inflight[i].client = -1;
 122 }
 123
 124 /* create a new thread */
 125 struct thread *create_thread( int fd, struct process *process )
 126 {
 127     struct thread *thread;
 128
 129     if (!(thread = alloc_object( &thread_ops, fd ))) return NULL;
 130
 131     init_thread_structure( thread );
 132
 133     thread->process = (struct process *)grab_object( process );
 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     fcntl( fd, F_SETFL, O_NONBLOCK );
 146     set_select_events( &thread->obj, POLLIN );  /* start listening to events */
 147     add_process_thread( thread->process, thread );
 148     return thread;
 149 }
 150
 151 /* handle a client event */
 152 static void thread_poll_event( struct object *obj, int event )
 153 {
 154     struct thread *thread = (struct thread *)obj;
 155     assert( obj->ops == &thread_ops );
 156
 157     if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
 158     else if (event & POLLIN) read_request( 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->buffer != (void *)-1) munmap( thread->buffer, MAX_REQUEST_LENGTH );
 170     if (thread->reply_fd != -1) close( thread->reply_fd );
 171     if (thread->wait_fd != -1) close( thread->wait_fd );
 172     if (thread->request_fd) release_object( thread->request_fd );
 173     if (thread->queue)
 174     {
 175         if (thread->process->queue == thread->queue)
 176         {
 177             release_object( thread->process->queue );
 178             thread->process->queue = NULL;
 179         }
 180         release_object( thread->queue );
 181         thread->queue = NULL;
 182     }
 183     destroy_thread_windows( thread );
 184     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 185     {
 186         if (thread->inflight[i].client != -1)
 187         {
 188             close( thread->inflight[i].server );
 189             thread->inflight[i].client = thread->inflight[i].server = -1;
 190         }
 191     }
 192     thread->buffer = (void *)-1;
 193     thread->reply_fd = -1;
 194     thread->wait_fd = -1;
 195     thread->request_fd = NULL;
 196 }
 197
 198 /* destroy a thread when its refcount is 0 */
 199 static void destroy_thread( struct object *obj )
 200 {
 201     struct thread_apc *apc;
 202     struct thread *thread = (struct thread *)obj;
 203     assert( obj->ops == &thread_ops );
 204
 205     assert( !thread->debug_ctx );  /* cannot still be debugging something */
 206     if (thread->next) thread->next->prev = thread->prev;
 207     if (thread->prev) thread->prev->next = thread->next;
 208     else first_thread = thread->next;
 209     while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
 210     if (thread->info) release_object( thread->info );
 211     cleanup_thread( thread );
 212     release_object( thread->process );
 213 }
 214
 215 /* dump a thread on stdout for debugging purposes */
 216 static void dump_thread( struct object *obj, int verbose )
 217 {
 218     struct thread *thread = (struct thread *)obj;
 219     assert( obj->ops == &thread_ops );
 220
 221     fprintf( stderr, "Thread pid=%d teb=%p state=%d\n",
 222              thread->unix_pid, thread->teb, thread->state );
 223 }
 224
 225 static int thread_signaled( struct object *obj, struct thread *thread )
 226 {
 227     struct thread *mythread = (struct thread *)obj;
 228     return (mythread->state == TERMINATED);
 229 }
 230
 231 /* get a thread pointer from a thread id (and increment the refcount) */
 232 struct thread *get_thread_from_id( void *id )
 233 {
 234     struct thread *t = first_thread;
 235     while (t && (t != id)) t = t->next;
 236     if (t) grab_object( t );
 237     else set_error( STATUS_INVALID_PARAMETER );
 238     return t;
 239 }
 240
 241 /* get a thread from a handle (and increment the refcount) */
 242 struct thread *get_thread_from_handle( handle_t handle, unsigned int access )
 243 {
 244     return (struct thread *)get_handle_obj( current->process, handle,
 245                                             access, &thread_ops );
 246 }
 247
 248 /* find a thread from a Unix pid */
 249 struct thread *get_thread_from_pid( int pid )
 250 {
 251     struct thread *t = first_thread;
 252     while (t && (t->unix_pid != pid)) t = t->next;
 253     return t;
 254 }
 255
 256 /* set all information about a thread */
 257 static void set_thread_info( struct thread *thread,
 258                              struct set_thread_info_request *req )
 259 {
 260     if (req->mask & SET_THREAD_INFO_PRIORITY)
 261         thread->priority = req->priority;
 262     if (req->mask & SET_THREAD_INFO_AFFINITY)
 263     {
 264         if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
 265         else thread->affinity = req->affinity;
 266     }
 267 }
 268
 269 /* suspend a thread */
 270 int suspend_thread( struct thread *thread, int check_limit )
 271 {
 272     int old_count = thread->suspend;
 273     if (thread->suspend < MAXIMUM_SUSPEND_COUNT || !check_limit)
 274     {
 275         if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
 276     }
 277     else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
 278     return old_count;
 279 }
 280
 281 /* resume a thread */
 282 int resume_thread( struct thread *thread )
 283 {
 284     int old_count = thread->suspend;
 285     if (thread->suspend > 0)
 286     {
 287         if (!(--thread->suspend + thread->process->suspend)) continue_thread( thread );
 288     }
 289     return old_count;
 290 }
 291
 292 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
 293 int add_queue( struct object *obj, struct wait_queue_entry *entry )
 294 {
 295     grab_object( obj );
 296     entry->obj    = obj;
 297     entry->prev   = obj->tail;
 298     entry->next   = NULL;
 299     if (obj->tail) obj->tail->next = entry;
 300     else obj->head = entry;
 301     obj->tail = entry;
 302     return 1;
 303 }
 304
 305 /* remove a thread from an object wait queue */
 306 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
 307 {
 308     if (entry->next) entry->next->prev = entry->prev;
 309     else obj->tail = entry->prev;
 310     if (entry->prev) entry->prev->next = entry->next;
 311     else obj->head = entry->next;
 312     release_object( obj );
 313 }
 314
 315 /* finish waiting */
 316 static void end_wait( struct thread *thread )
 317 {
 318     struct thread_wait *wait = thread->wait;
 319     struct wait_queue_entry *entry;
 320     int i;
 321
 322     assert( wait );
 323     for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 324         entry->obj->ops->remove_queue( entry->obj, entry );
 325     if (wait->user) remove_timeout_user( wait->user );
 326     thread->wait = wait->next;
 327     free( wait );
 328 }
 329
 330 /* build the thread wait structure */
 331 static int wait_on( int count, struct object *objects[], int flags, int sec, int usec )
 332 {
 333     struct thread_wait *wait;
 334     struct wait_queue_entry *entry;
 335     int i;
 336
 337     if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
 338     wait->next    = current->wait;
 339     wait->thread  = current;
 340     wait->count   = count;
 341     wait->flags   = flags;
 342     wait->user    = NULL;
 343     current->wait = wait;
 344     if (flags & SELECT_TIMEOUT)
 345     {
 346         wait->timeout.tv_sec = sec;
 347         wait->timeout.tv_usec = usec;
 348     }
 349
 350     for (i = 0, entry = wait->queues; i < count; i++, entry++)
 351     {
 352         struct object *obj = objects[i];
 353         entry->thread = current;
 354         if (!obj->ops->add_queue( obj, entry ))
 355         {
 356             wait->count = i;
 357             end_wait( current );
 358             return 0;
 359         }
 360     }
 361     return 1;
 362 }
 363
 364 /* check if the thread waiting condition is satisfied */
 365 static int check_wait( struct thread *thread )
 366 {
 367     int i, signaled;
 368     struct thread_wait *wait = thread->wait;
 369     struct wait_queue_entry *entry = wait->queues;
 370
 371     assert( wait );
 372     if (wait->flags & SELECT_ALL)
 373     {
 374         int not_ok = 0;
 375         /* Note: we must check them all anyway, as some objects may
 376          * want to do something when signaled, even if others are not */
 377         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 378             not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
 379         if (not_ok) goto other_checks;
 380         /* Wait satisfied: tell it to all objects */
 381         signaled = 0;
 382         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 383             if (entry->obj->ops->satisfied( entry->obj, thread ))
 384                 signaled = STATUS_ABANDONED_WAIT_0;
 385         return signaled;
 386     }
 387     else
 388     {
 389         for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
 390         {
 391             if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
 392             /* Wait satisfied: tell it to the object */
 393             signaled = i;
 394             if (entry->obj->ops->satisfied( entry->obj, thread ))
 395                 signaled = i + STATUS_ABANDONED_WAIT_0;
 396             return signaled;
 397         }
 398     }
 399
 400  other_checks:
 401     if ((wait->flags & SELECT_INTERRUPTIBLE) && thread->system_apc.head) return STATUS_USER_APC;
 402     if ((wait->flags & SELECT_ALERTABLE) && thread->user_apc.head) return STATUS_USER_APC;
 403     if (wait->flags & SELECT_TIMEOUT)
 404     {
 405         struct timeval now;
 406         gettimeofday( &now, NULL );
 407         if (!time_before( &now, &wait->timeout )) return STATUS_TIMEOUT;
 408     }
 409     return -1;
 410 }
 411
 412 /* send the wakeup signal to a thread */
 413 static int send_thread_wakeup( struct thread *thread, void *cookie, int signaled )
 414 {
 415     struct wake_up_reply reply;
 416     int ret;
 417
 418     reply.cookie   = cookie;
 419     reply.signaled = signaled;
 420     if ((ret = write( thread->wait_fd, &reply, sizeof(reply) )) == sizeof(reply)) return 0;
 421     if (ret >= 0)
 422         fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
 423     else if (errno == EPIPE)
 424         kill_thread( thread, 0 );  /* normal death */
 425     else
 426         fatal_protocol_perror( thread, "write" );
 427     return -1;
 428 }
 429
 430 /* attempt to wake up a thread */
 431 /* return >0 if OK, 0 if the wait condition is still not satisfied */
 432 static int wake_thread( struct thread *thread )
 433 {
 434     int signaled, count;
 435     void *cookie;
 436
 437     for (count = 0; thread->wait; count++)
 438     {
 439         if ((signaled = check_wait( thread )) == -1) break;
 440
 441         cookie = thread->wait->cookie;
 442         if (debug_level) fprintf( stderr, "%08x: *wakeup* signaled=%d cookie=%p\n",
 443                                   (unsigned int)thread, signaled, cookie );
 444         end_wait( thread );
 445         if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
 446             break;
 447     }
 448     return count;
 449 }
 450
 451 /* thread wait timeout */
 452 static void thread_timeout( void *ptr )
 453 {
 454     struct thread_wait *wait = ptr;
 455     struct thread *thread = wait->thread;
 456     void *cookie = wait->cookie;
 457
 458     wait->user = NULL;
 459     if (thread->wait != wait) return; /* not the top-level wait, ignore it */
 460
 461     if (debug_level) fprintf( stderr, "%08x: *wakeup* signaled=%d cookie=%p\n",
 462                               (unsigned int)thread, STATUS_TIMEOUT, cookie );
 463     end_wait( thread );
 464     send_thread_wakeup( thread, cookie, STATUS_TIMEOUT );
 465     /* check if other objects have become signaled in the meantime */
 466     wake_thread( thread );
 467 }
 468
 469 /* select on a list of handles */
 470 static void select_on( int count, void *cookie, handle_t *handles, int flags, int sec, int usec )
 471 {
 472     int ret, i;
 473     struct object *objects[MAXIMUM_WAIT_OBJECTS];
 474
 475     if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
 476     {
 477         set_error( STATUS_INVALID_PARAMETER );
 478         return;
 479     }
 480     for (i = 0; i < count; i++)
 481     {
 482         if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
 483             break;
 484     }
 485
 486     if (i < count) goto done;
 487     if (!wait_on( count, objects, flags, sec, usec )) goto done;
 488
 489     if ((ret = check_wait( current )) != -1)
 490     {
 491         /* condition is already satisfied */
 492         end_wait( current );
 493         set_error( ret );
 494         goto done;
 495     }
 496
 497     /* now we need to wait */
 498     if (flags & SELECT_TIMEOUT)
 499     {
 500         if (!(current->wait->user = add_timeout_user( &current->wait->timeout,
 501                                                       thread_timeout, current->wait )))
 502         {
 503             end_wait( current );
 504             goto done;
 505         }
 506     }
 507     current->wait->cookie = cookie;
 508     set_error( STATUS_PENDING );
 509
 510 done:
 511     while (--i >= 0) release_object( objects[i] );
 512 }
 513
 514 /* attempt to wake threads sleeping on the object wait queue */
 515 void wake_up( struct object *obj, int max )
 516 {
 517     struct wait_queue_entry *entry = obj->head;
 518
 519     while (entry)
 520     {
 521         struct thread *thread = entry->thread;
 522         entry = entry->next;
 523         if (wake_thread( thread ))
 524         {
 525             if (max && !--max) break;
 526         }
 527     }
 528 }
 529
 530 /* queue an async procedure call */
 531 int thread_queue_apc( struct thread *thread, struct object *owner, void *func,
 532                       enum apc_type type, int system, int nb_args, ... )
 533 {
 534     struct thread_apc *apc;
 535     struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
 536
 537     /* cancel a possible previous APC with the same owner */
 538     if (owner) thread_cancel_apc( thread, owner, system );
 539
 540     if (!(apc = mem_alloc( sizeof(*apc) + (nb_args-1)*sizeof(apc->args[0]) ))) return 0;
 541     apc->prev    = queue->tail;
 542     apc->next    = NULL;
 543     apc->owner   = owner;
 544     apc->func    = func;
 545     apc->type    = type;
 546     apc->nb_args = nb_args;
 547     if (nb_args)
 548     {
 549         int i;
 550         va_list args;
 551         va_start( args, nb_args );
 552         for (i = 0; i < nb_args; i++) apc->args[i] = va_arg( args, void * );
 553         va_end( args );
 554     }
 555     queue->tail = apc;
 556     if (!apc->prev)  /* first one */
 557     {
 558         queue->head = apc;
 559         wake_thread( thread );
 560     }
 561     return 1;
 562 }
 563
 564 /* cancel the async procedure call owned by a specific object */
 565 void thread_cancel_apc( struct thread *thread, struct object *owner, int system )
 566 {
 567     struct thread_apc *apc;
 568     struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
 569     for (apc = queue->head; apc; apc = apc->next)
 570     {
 571         if (apc->owner != owner) continue;
 572         if (apc->next) apc->next->prev = apc->prev;
 573         else queue->tail = apc->prev;
 574         if (apc->prev) apc->prev->next = apc->next;
 575         else queue->head = apc->next;
 576         free( apc );
 577         return;
 578     }
 579 }
 580
 581 /* remove the head apc from the queue; the returned pointer must be freed by the caller */
 582 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
 583 {
 584     struct thread_apc *apc;
 585     struct apc_queue *queue = &thread->system_apc;
 586
 587     if (!queue->head && !system_only) queue = &thread->user_apc;
 588     if ((apc = queue->head))
 589     {
 590         if (apc->next) apc->next->prev = NULL;
 591         else queue->tail = NULL;
 592         queue->head = apc->next;
 593     }
 594     return apc;
 595 }
 596
 597 /* add an fd to the inflight list */
 598 /* return list index, or -1 on error */
 599 int thread_add_inflight_fd( struct thread *thread, int client, int server )
 600 {
 601     int i;
 602
 603     if (server == -1) return -1;
 604     if (client == -1)
 605     {
 606         close( server );
 607         return -1;
 608     }
 609
 610     /* first check if we already have an entry for this fd */
 611     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 612         if (thread->inflight[i].client == client)
 613         {
 614             close( thread->inflight[i].server );
 615             thread->inflight[i].server = server;
 616             return i;
 617         }
 618
 619     /* now find a free spot to store it */
 620     for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 621         if (thread->inflight[i].client == -1)
 622         {
 623             thread->inflight[i].client = client;
 624             thread->inflight[i].server = server;
 625             return i;
 626         }
 627     return -1;
 628 }
 629
 630 /* get an inflight fd and purge it from the list */
 631 /* the fd must be closed when no longer used */
 632 int thread_get_inflight_fd( struct thread *thread, int client )
 633 {
 634     int i, ret;
 635
 636     if (client == -1) return -1;
 637
 638     do
 639     {
 640         for (i = 0; i < MAX_INFLIGHT_FDS; i++)
 641         {
 642             if (thread->inflight[i].client == client)
 643             {
 644                 ret = thread->inflight[i].server;
 645                 thread->inflight[i].server = thread->inflight[i].client = -1;
 646                 return ret;
 647             }
 648         }
 649     } while (!receive_fd( thread->process ));  /* in case it is still in the socket buffer */
 650     return -1;
 651 }
 652
 653 /* retrieve an LDT selector entry */
 654 static void get_selector_entry( struct thread *thread, int entry,
 655                                 unsigned int *base, unsigned int *limit,
 656                                 unsigned char *flags )
 657 {
 658     if (!thread->process->ldt_copy)
 659     {
 660         set_error( STATUS_ACCESS_DENIED );
 661         return;
 662     }
 663     if (entry >= 8192)
 664     {
 665         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 666         return;
 667     }
 668     if (suspend_for_ptrace( thread ))
 669     {
 670         unsigned char flags_buf[4];
 671         int *addr = (int *)thread->process->ldt_copy + entry;
 672         if (read_thread_int( thread, addr, base ) == -1) goto done;
 673         if (read_thread_int( thread, addr + 8192, limit ) == -1) goto done;
 674         addr = (int *)thread->process->ldt_copy + 2*8192 + (entry >> 2);
 675         if (read_thread_int( thread, addr, (int *)flags_buf ) == -1) goto done;
 676         *flags = flags_buf[entry & 3];
 677     done:
 678         resume_thread( thread );
 679     }
 680 }
 681
 682 /* kill a thread on the spot */
 683 void kill_thread( struct thread *thread, int violent_death )
 684 {
 685     if (thread->state == TERMINATED) return;  /* already killed */
 686     thread->state = TERMINATED;
 687     if (current == thread) current = NULL;
 688     if (debug_level)
 689         fprintf( stderr,"%08x: *killed* exit_code=%d\n",
 690                  (unsigned int)thread, thread->exit_code );
 691     if (thread->wait)
 692     {
 693         while (thread->wait) end_wait( thread );
 694         send_thread_wakeup( thread, NULL, STATUS_PENDING );
 695         /* if it is waiting on the socket, we don't need to send a SIGTERM */
 696         violent_death = 0;
 697     }
 698     debug_exit_thread( thread );
 699     abandon_mutexes( thread );
 700     remove_process_thread( thread->process, thread );
 701     wake_up( &thread->obj, 0 );
 702     detach_thread( thread, violent_death ? SIGTERM : 0 );
 703     remove_select_user( &thread->obj );
 704     cleanup_thread( thread );
 705     release_object( thread );
 706 }
 707
 708 /* take a snapshot of currently running threads */
 709 struct thread_snapshot *thread_snap( int *count )
 710 {
 711     struct thread_snapshot *snapshot, *ptr;
 712     struct thread *thread;
 713     int total = 0;
 714
 715     for (thread = first_thread; thread; thread = thread->next)
 716         if (thread->state != TERMINATED) total++;
 717     if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
 718     ptr = snapshot;
 719     for (thread = first_thread; thread; thread = thread->next)
 720     {
 721         if (thread->state == TERMINATED) continue;
 722         ptr->thread   = thread;
 723         ptr->count    = thread->obj.refcount;
 724         ptr->priority = thread->priority;
 725         grab_object( thread );
 726         ptr++;
 727     }
 728     *count = total;
 729     return snapshot;
 730 }
 731
 732 /* signal that we are finished booting on the client side */
 733 DECL_HANDLER(boot_done)
 734 {
 735     debug_level = max( debug_level, req->debug_level );
 736     if (current == booting_thread)
 737     {
 738         booting_thread = (struct thread *)~0UL;  /* make sure it doesn't match other threads */
 739         lock_master_socket(0);  /* allow other clients now */
 740     }
 741 }
 742
 743 /* create a new thread */
 744 DECL_HANDLER(new_thread)
 745 {
 746     struct thread *thread;
 747     int request_fd = thread_get_inflight_fd( current, req->request_fd );
 748
 749     if (request_fd == -1)
 750     {
 751         set_error( STATUS_INVALID_HANDLE );
 752         return;
 753     }
 754
 755     if ((thread = create_thread( request_fd, current->process )))
 756     {
 757         if (req->suspend) thread->suspend++;
 758         req->tid = thread;
 759         if ((req->handle = alloc_handle( current->process, thread,
 760                                          THREAD_ALL_ACCESS, req->inherit )))
 761         {
 762             /* thread object will be released when the thread gets killed */
 763             return;
 764         }
 765         kill_thread( thread, 1 );
 766         request_fd = -1;
 767     }
 768 }
 769
 770 /* initialize a new thread */
 771 DECL_HANDLER(init_thread)
 772 {
 773     int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
 774     int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
 775
 776     if (current->unix_pid)
 777     {
 778         fatal_protocol_error( current, "init_thread: already running\n" );
 779         goto error;
 780     }
 781     if (reply_fd == -1)
 782     {
 783         fatal_protocol_error( current, "bad reply fd\n" );
 784         goto error;
 785     }
 786     if (wait_fd == -1)
 787     {
 788         fatal_protocol_error( current, "bad wait fd\n" );
 789         goto error;
 790     }
 791
 792     current->unix_pid = req->unix_pid;
 793     current->teb      = req->teb;
 794     current->reply_fd = reply_fd;
 795     current->wait_fd  = wait_fd;
 796
 797     if (current->suspend + current->process->suspend > 0) stop_thread( current );
 798     if (current->process->running_threads > 1)
 799         generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
 800
 801     req->pid     = get_process_id( current->process );
 802     req->tid     = get_thread_id( current );
 803     req->boot    = (current == booting_thread);
 804     req->version = SERVER_PROTOCOL_VERSION;
 805     return;
 806
 807  error:
 808     if (reply_fd != -1) close( reply_fd );
 809     if (wait_fd != -1) close( wait_fd );
 810 }
 811
 812 /* set the shared buffer for a thread */
 813 DECL_HANDLER(set_thread_buffer)
 814 {
 815     unsigned int size = MAX_REQUEST_LENGTH;
 816     unsigned int offset = 0;
 817     int fd = thread_get_inflight_fd( current, req->fd );
 818
 819     req->size = size;
 820     req->offset = offset;
 821
 822     if (fd != -1)
 823     {
 824         if (ftruncate( fd, size ) == -1) file_set_error();
 825         else
 826         {
 827             void *buffer = mmap( 0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset );
 828             if (buffer == (void *)-1) file_set_error();
 829             else
 830             {
 831                 if (current->buffer != (void *)-1) munmap( current->buffer, size );
 832                 current->buffer = buffer;
 833             }
 834         }
 835         close( fd );
 836     }
 837     else set_error( STATUS_INVALID_HANDLE );
 838 }
 839
 840 /* terminate a thread */
 841 DECL_HANDLER(terminate_thread)
 842 {
 843     struct thread *thread;
 844
 845     req->self = 0;
 846     req->last = 0;
 847     if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
 848     {
 849         thread->exit_code = req->exit_code;
 850         if (thread != current) kill_thread( thread, 1 );
 851         else
 852         {
 853             req->self = 1;
 854             req->last = (thread->process->running_threads == 1);
 855         }
 856         release_object( thread );
 857     }
 858 }
 859
 860 /* fetch information about a thread */
 861 DECL_HANDLER(get_thread_info)
 862 {
 863     struct thread *thread;
 864     handle_t handle = req->handle;
 865
 866     if (!handle) thread = get_thread_from_id( req->tid_in );
 867     else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
 868
 869     if (thread)
 870     {
 871         req->tid       = get_thread_id( thread );
 872         req->teb       = thread->teb;
 873         req->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
 874         req->priority  = thread->priority;
 875         release_object( thread );
 876     }
 877 }
 878
 879 /* set information about a thread */
 880 DECL_HANDLER(set_thread_info)
 881 {
 882     struct thread *thread;
 883
 884     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
 885     {
 886         set_thread_info( thread, req );
 887         release_object( thread );
 888     }
 889 }
 890
 891 /* suspend a thread */
 892 DECL_HANDLER(suspend_thread)
 893 {
 894     struct thread *thread;
 895
 896     if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
 897     {
 898         req->count = suspend_thread( thread, 1 );
 899         release_object( thread );
 900     }
 901 }
 902
 903 /* resume a thread */
 904 DECL_HANDLER(resume_thread)
 905 {
 906     struct thread *thread;
 907
 908     if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
 909     {
 910         req->count = resume_thread( thread );
 911         release_object( thread );
 912     }
 913 }
 914
 915 /* select on a handle list */
 916 DECL_HANDLER(select)
 917 {
 918     int count = get_req_data_size(req) / sizeof(int);
 919     select_on( count, req->cookie, get_req_data(req), req->flags, req->sec, req->usec );
 920 }
 921
 922 /* queue an APC for a thread */
 923 DECL_HANDLER(queue_apc)
 924 {
 925     struct thread *thread;
 926     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
 927     {
 928         thread_queue_apc( thread, NULL, req->func, APC_USER, !req->user, 1, req->param );
 929         release_object( thread );
 930     }
 931 }
 932
 933 /* get next APC to call */
 934 DECL_HANDLER(get_apc)
 935 {
 936     struct thread_apc *apc;
 937     size_t size;
 938
 939     for (;;)
 940     {
 941         if (!(apc = thread_dequeue_apc( current, !req->alertable )))
 942         {
 943             /* no more APCs */
 944             req->func    = NULL;
 945             req->type    = APC_NONE;
 946             set_req_data_size( req, 0 );
 947             return;
 948         }
 949         /* Optimization: ignore APCs that have a NULL func; they are only used
 950          * to wake up a thread, but since we got here the thread woke up already.
 951          */
 952         if (apc->func) break;
 953         free( apc );
 954     }
 955     size = apc->nb_args * sizeof(apc->args[0]);
 956     if (size > get_req_data_size(req)) size = get_req_data_size(req);
 957     req->func = apc->func;
 958     req->type = apc->type;
 959     memcpy( get_req_data(req), apc->args, size );
 960     set_req_data_size( req, size );
 961     free( apc );
 962 }
 963
 964 /* fetch a selector entry for a thread */
 965 DECL_HANDLER(get_selector_entry)
 966 {
 967     struct thread *thread;
 968     if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
 969     {
 970         get_selector_entry( thread, req->entry, &req->base, &req->limit, &req->flags );
 971         release_object( thread );
 972     }
 973 }