gdb/testsuite/gdb.threads/bp_in_thread.c

   1 /* A small multi-threaded test case.
   2
   3    Copyright 2004, 2007 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 2 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, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <pthread.h>
  23 #include <stdio.h>
  24 #include <time.h>
  25
  26 void
  27 cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)
  28 {
  29   pthread_mutex_lock(mut);
  30   pthread_cond_wait (cond, mut);
  31   pthread_mutex_unlock (mut);
  32 }
  33
  34 void
  35 noreturn (void)
  36 {
  37   pthread_mutex_t mut;
  38   pthread_cond_t cond;
  39
  40   pthread_mutex_init (&mut, NULL);
  41   pthread_cond_init (&cond, NULL);
  42
  43   /* Wait for a condition that will never be signaled, so we effectively
  44      block the thread here.  */
  45   cond_wait (&cond, &mut);
  46 }
  47
  48 void *
  49 forever_pthread (void *unused)
  50 {
  51   noreturn ();
  52 }
  53
  54 void
  55 break_me (void)
  56 {
  57   /* Just an anchor to help putting a breakpoint.  */
  58 }
  59
  60 int
  61 main (void)
  62 {
  63   pthread_t forever;
  64   const struct timespec ts = { 0, 10000000 }; /* 0.01 sec */
  65
  66   pthread_create (&forever, NULL, forever_pthread, NULL);
  67   for (;;)
  68     {
  69       nanosleep (&ts, NULL);
  70       break_me();
  71     }
  72
  73   return 0;
  74 }
  75