gdb/testsuite/gdb.threads/pthread_cond_wait.c

   1 /* A small multi-threaded test case.
   2
   3    Copyright 2004-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <time.h>
  23 #include <unistd.h>
  24
  25 void
  26 cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)
  27 {
  28   pthread_mutex_lock(mut);
  29   pthread_cond_wait (cond, mut);
  30   pthread_mutex_unlock (mut);
  31 }
  32
  33 void
  34 noreturn (void)
  35 {
  36   pthread_mutex_t mut;
  37   pthread_cond_t cond;
  38
  39   pthread_mutex_init (&mut, NULL);
  40   pthread_cond_init (&cond, NULL);
  41
  42   /* Wait for a condition that will never be signaled, so we effectively
  43      block the thread here.  */
  44   cond_wait (&cond, &mut);
  45 }
  46
  47 void *
  48 forever_pthread (void *unused)
  49 {
  50   noreturn ();
  51 }
  52
  53 void
  54 break_me (void)
  55 {
  56   /* Just an anchor to help putting a breakpoint.  */
  57 }
  58
  59 int
  60 main (void)
  61 {
  62   pthread_t forever;
  63
  64   pthread_create (&forever, NULL, forever_pthread, NULL);
  65   for (;;)
  66     {
  67       sleep (2);
  68       break_me();
  69     }
  70
  71   return 0;
  72 }
  73