gnu/dist/gdb6/gdb/testsuite/gdb.threads/pthread_cond_wait.c

   1 /* A small multi-threaded test case.
   2
   3    Copyright 2004
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include <pthread.h>
  24 #include <stdio.h>
  25 #include <time.h>
  26
  27 void
  28 cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)
  29 {
  30   pthread_mutex_lock(mut);
  31   pthread_cond_wait (cond, mut);
  32   pthread_mutex_unlock (mut);
  33 }
  34
  35 void
  36 noreturn (void)
  37 {
  38   pthread_mutex_t mut;
  39   pthread_cond_t cond;
  40
  41   pthread_mutex_init (&mut, NULL);
  42   pthread_cond_init (&cond, NULL);
  43
  44   /* Wait for a condition that will never be signaled, so we effectively
  45      block the thread here.  */
  46   cond_wait (&cond, &mut);
  47 }
  48
  49 void *
  50 forever_pthread (void *unused)
  51 {
  52   noreturn ();
  53 }
  54
  55 void
  56 break_me (void)
  57 {
  58   /* Just an anchor to help putting a breakpoint.  */
  59 }
  60
  61 int
  62 main (void)
  63 {
  64   pthread_t forever;
  65   const struct timespec ts = { 0, 10000000 }; /* 0.01 sec */
  66
  67   pthread_create (&forever, NULL, forever_pthread, NULL);
  68   for (;;)
  69     {
  70       nanosleep (&ts, NULL);
  71       break_me();
  72     }
  73
  74   return 0;
  75 }
  76