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- /* Multithreading primitives.
- Copyright (C) 2005-2009 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify it
- under the terms of the GNU Library General Public License as published
- by the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- USA. */
-
- /* Written by Bruno Haible <bruno@clisp.org>, 2005. */
-
- #include <config.h>
-
- /* ========================================================================= */
-
- #if USE_POSIX_THREADS
-
- /* Use the POSIX threads library. */
-
- # include <pthread.h>
- # include <stdlib.h>
-
- # if PTHREAD_IN_USE_DETECTION_HARD
-
- /* The function to be executed by a dummy thread. */
- static void *
- dummy_thread_func (void *arg)
- {
- return arg;
- }
-
- int
- glthread_in_use (void)
- {
- static int tested;
- static int result; /* 1: linked with -lpthread, 0: only with libc */
-
- if (!tested)
- {
- pthread_t thread;
-
- if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
- /* Thread creation failed. */
- result = 0;
- else
- {
- /* Thread creation works. */
- void *retval;
- if (pthread_join (thread, &retval) != 0)
- abort ();
- result = 1;
- }
- tested = 1;
- }
- return result;
- }
-
- # endif
-
- #endif
-
- /* ========================================================================= */
-
- /* This declaration is solely to ensure that after preprocessing
- this file is never empty. */
- typedef int dummy;
-