1 /* This test program is part of GDB, The GNU debugger.
2 
3    Copyright 2004 Free Software Foundation, Inc.
4 
5    Originally written by Jeff Johnston <jjohnstn@redhat.com>,
6    contributed by Red Hat
7 
8    This file is part of GDB.
9 
10    This program is free software; you can redistribute it and/or modify
11    it under the terms of the GNU General Public License as published by
12    the Free Software Foundation; either version 2 of the License, or
13    (at your option) any later version.
14 
15    This program is distributed in the hope that it will be useful,
16    but WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    GNU General Public License for more details.
19 
20    You should have received a copy of the GNU General Public License
21    along with this program; if not, write to the Free Software
22    Foundation, Inc., 59 Temple Place - Suite 330,
23    Boston, MA 02111-1307, USA.  */
24 
25 #include <pthread.h>
26 #include <semaphore.h>
27 #include <stdio.h>
28 #include <limits.h>
29 #include <errno.h>
30 
31 sem_t semaphore;
32 
33 void *
34 thread_function (void *arg)
35 {
36   printf ("Thread executing\n");
37   while (sem_wait (&semaphore) != 0)
38     {
39       if (errno != EINTR)
40 	{
41 	  perror ("thread_function");
42 	  return;
43 	}
44     }
45   return NULL;
46 }
47 
48 int
49 main (int argc, char **argv)
50 {
51   pthread_attr_t attr;
52 
53   pthread_attr_init (&attr);
54   pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
55 
56   if (sem_init (&semaphore, 0, 0) == -1)
57     {
58       perror ("semaphore");
59       return -1;
60     }
61 
62 
63   /* Create a thread, wait for it to complete.  */
64   {
65     pthread_t thread;
66     pthread_create (&thread, &attr, thread_function, NULL);
67     sem_post (&semaphore);
68     pthread_join (thread, NULL);
69   }
70 
71   pthread_attr_destroy (&attr);
72   return 0;
73 }
74