mingw/share/gettext/intl/threadlib.c

   1 /* Multithreading primitives.
   2    Copyright (C) 2005-2009 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU Library General Public License as published
   6    by the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17    USA.  */
  18
  19 /* Written by Bruno Haible <bruno@clisp.org>, 2005.  */
  20
  21 #include <config.h>
  22
  23 /* ========================================================================= */
  24
  25 #if USE_POSIX_THREADS
  26
  27 /* Use the POSIX threads library.  */
  28
  29 # include <pthread.h>
  30 # include <stdlib.h>
  31
  32 # if PTHREAD_IN_USE_DETECTION_HARD
  33
  34 /* The function to be executed by a dummy thread.  */
  35 static void *
  36 dummy_thread_func (void *arg)
  37 {
  38   return arg;
  39 }
  40
  41 int
  42 glthread_in_use (void)
  43 {
  44   static int tested;
  45   static int result; /* 1: linked with -lpthread, 0: only with libc */
  46
  47   if (!tested)
  48     {
  49       pthread_t thread;
  50
  51       if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
  52         /* Thread creation failed.  */
  53         result = 0;
  54       else
  55         {
  56           /* Thread creation works.  */
  57           void *retval;
  58           if (pthread_join (thread, &retval) != 0)
  59             abort ();
  60           result = 1;
  61         }
  62       tested = 1;
  63     }
  64   return result;
  65 }
  66
  67 # endif
  68
  69 #endif
  70
  71 /* ========================================================================= */
  72
  73 /* This declaration is solely to ensure that after preprocessing
  74    this file is never empty.  */
  75 typedef int dummy;