| 1 | /* Multithreading primitives.
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| 2 | Copyright (C) 2005-2012 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program; if not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <bruno@clisp.org>, 2005. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | /* ========================================================================= */
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| 22 |
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| 23 | #if USE_POSIX_THREADS
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| 24 |
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| 25 | /* Use the POSIX threads library. */
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| 26 |
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| 27 | # include <pthread.h>
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| 28 | # include <stdlib.h>
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| 29 |
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| 30 | # if PTHREAD_IN_USE_DETECTION_HARD
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| 31 |
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| 32 | /* The function to be executed by a dummy thread. */
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| 33 | static void *
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| 34 | dummy_thread_func (void *arg)
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| 35 | {
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| 36 | return arg;
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| 37 | }
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| 38 |
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| 39 | int
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| 40 | glthread_in_use (void)
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| 41 | {
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| 42 | static int tested;
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| 43 | static int result; /* 1: linked with -lpthread, 0: only with libc */
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| 44 |
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| 45 | if (!tested)
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| 46 | {
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| 47 | pthread_t thread;
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| 48 |
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| 49 | if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
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| 50 | /* Thread creation failed. */
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| 51 | result = 0;
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| 52 | else
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| 53 | {
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| 54 | /* Thread creation works. */
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| 55 | void *retval;
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| 56 | if (pthread_join (thread, &retval) != 0)
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| 57 | abort ();
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| 58 | result = 1;
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| 59 | }
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| 60 | tested = 1;
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| 61 | }
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| 62 | return result;
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| 63 | }
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| 64 |
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| 65 | # endif
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| 66 |
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| 67 | #endif
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| 68 |
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| 69 | /* ========================================================================= */
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| 70 |
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| 71 | /* This declaration is solely to ensure that after preprocessing
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| 72 | this file is never empty. */
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| 73 | typedef int dummy;
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