| 1 | /* Multithreading primitives.
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| 2 | Copyright (C) 2005-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file 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 Lesser 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 Lesser General Public License
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| 15 | along with this program. If not, see <https://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 || USE_ISOC_AND_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 <errno.h>
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| 28 | # include <pthread.h>
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| 29 | # include <stdlib.h>
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| 30 |
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| 31 | # if PTHREAD_IN_USE_DETECTION_HARD
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| 32 |
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| 33 | # if defined __FreeBSD__ || defined __DragonFly__ /* FreeBSD */
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| 34 |
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| 35 | /* Test using pthread_key_create. */
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| 36 |
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| 37 | int
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| 38 | glthread_in_use (void)
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| 39 | {
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| 40 | static int tested;
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| 41 | static int result; /* 1: linked with -lpthread, 0: only with libc */
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| 42 |
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| 43 | if (!tested)
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| 44 | {
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| 45 | pthread_key_t key;
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| 46 | int err = pthread_key_create (&key, NULL);
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| 47 |
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| 48 | if (err == ENOSYS)
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| 49 | result = 0;
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| 50 | else
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| 51 | {
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| 52 | result = 1;
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| 53 | if (err == 0)
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| 54 | pthread_key_delete (key);
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| 55 | }
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| 56 | tested = 1;
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| 57 | }
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| 58 | return result;
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| 59 | }
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| 60 |
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| 61 | # else /* Solaris, HP-UX */
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| 62 |
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| 63 | /* Test using pthread_create. */
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| 64 |
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| 65 | /* The function to be executed by a dummy thread. */
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| 66 | static void *
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| 67 | dummy_thread_func (void *arg)
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| 68 | {
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| 69 | return arg;
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| 70 | }
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| 71 |
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| 72 | int
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| 73 | glthread_in_use (void)
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| 74 | {
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| 75 | static int tested;
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| 76 | static int result; /* 1: linked with -lpthread, 0: only with libc */
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| 77 |
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| 78 | if (!tested)
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| 79 | {
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| 80 | pthread_t thread;
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| 81 |
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| 82 | if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
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| 83 | /* Thread creation failed. */
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| 84 | result = 0;
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| 85 | else
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| 86 | {
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| 87 | /* Thread creation works. */
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| 88 | void *retval;
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| 89 | if (pthread_join (thread, &retval) != 0)
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| 90 | abort ();
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| 91 | result = 1;
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| 92 | }
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| 93 | tested = 1;
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| 94 | }
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| 95 | return result;
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| 96 | }
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| 97 |
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| 98 | # endif
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| 99 |
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| 100 | # endif
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| 101 |
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| 102 | #endif
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| 103 |
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| 104 | /* ========================================================================= */
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| 105 |
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| 106 | /* This declaration is solely to ensure that after preprocessing
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| 107 | this file is never empty. */
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| 108 | typedef int dummy;
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