gdb/testsuite/gdb.threads/bp_in_thread.c

   1 /* A small multi-threaded test case.
   2
   3    Copyright 2004, 2007, 2008, 2009 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
  24 void
  25 cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)
  26 {
  27   pthread_mutex_lock(mut);
  28   pthread_cond_wait (cond, mut);
  29   pthread_mutex_unlock (mut);
  30 }
  31
  32 void
  33 noreturn (void)
  34 {
  35   pthread_mutex_t mut;
  36   pthread_cond_t cond;
  37
  38   pthread_mutex_init (&mut, NULL);
  39   pthread_cond_init (&cond, NULL);
  40
  41   /* Wait for a condition that will never be signaled, so we effectively
  42      block the thread here.  */
  43   cond_wait (&cond, &mut);
  44 }
  45
  46 void *
  47 forever_pthread (void *unused)
  48 {
  49   noreturn ();
  50 }
  51
  52 void
  53 break_me (void)
  54 {
  55   /* Just an anchor to help putting a breakpoint.  */
  56 }
  57
  58 int
  59 main (void)
  60 {
  61   pthread_t forever;
  62   const struct timespec ts = { 0, 10000000 }; /* 0.01 sec */
  63
  64   pthread_create (&forever, NULL, forever_pthread, NULL);
  65   for (;;)
  66     {
  67       nanosleep (&ts, NULL);
  68       break_me();
  69     }
  70
  71   return 0;
  72 }
  73