109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* Multithreading primitives.
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Copyright (C) 2005-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
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#include <config.h>
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/* ========================================================================= */
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#if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
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/* Use the POSIX threads library. */
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# include <errno.h>
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# include <pthread.h>
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# include <stdlib.h>
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# if PTHREAD_IN_USE_DETECTION_HARD
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# if defined __FreeBSD__ || defined __DragonFly__ /* FreeBSD */
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/* Test using pthread_key_create. */
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int
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glthread_in_use (void)
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{
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static int tested;
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static int result; /* 1: linked with -lpthread, 0: only with libc */
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if (!tested)
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{
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pthread_key_t key;
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int err = pthread_key_create (&key, NULL);
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if (err == ENOSYS)
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result = 0;
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else
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{
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result = 1;
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if (err == 0)
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pthread_key_delete (key);
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}
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tested = 1;
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}
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return result;
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}
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# else /* Solaris, HP-UX */
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/* Test using pthread_create. */
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/* The function to be executed by a dummy thread. */
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static void *
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dummy_thread_func (void *arg)
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{
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return arg;
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}
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int
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glthread_in_use (void)
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{
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static int tested;
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static int result; /* 1: linked with -lpthread, 0: only with libc */
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if (!tested)
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{
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pthread_t thread;
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if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
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/* Thread creation failed. */
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result = 0;
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else
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{
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/* Thread creation works. */
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void *retval;
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if (pthread_join (thread, &retval) != 0)
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abort ();
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result = 1;
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}
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tested = 1;
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}
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return result;
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}
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# endif
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# endif
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#endif
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/* ========================================================================= */
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/* This declaration is solely to ensure that after preprocessing
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this file is never empty. */
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typedef int dummy;
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