| 1 | /* Multithreading primitives.
|
|---|
| 2 | Copyright (C) 2005-2021 Free Software Foundation, Inc.
|
|---|
| 3 |
|
|---|
| 4 | This file is free software: you can redistribute it and/or modify
|
|---|
| 5 | it under the terms of the GNU Lesser General Public License as
|
|---|
| 6 | published by the Free Software Foundation; either version 2.1 of the
|
|---|
| 7 | License, or (at your option) any later version.
|
|---|
| 8 |
|
|---|
| 9 | This file 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
|
|---|
| 12 | GNU Lesser General Public License for more details.
|
|---|
| 13 |
|
|---|
| 14 | You should have received a copy of the GNU Lesser General Public License
|
|---|
| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|---|
| 16 |
|
|---|
| 17 | /* Written by Bruno Haible <[email protected]>, 2005. */
|
|---|
| 18 |
|
|---|
| 19 | #include <config.h>
|
|---|
| 20 |
|
|---|
| 21 | /* ========================================================================= */
|
|---|
| 22 |
|
|---|
| 23 | #if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
|
|---|
| 24 |
|
|---|
| 25 | /* Use the POSIX threads library. */
|
|---|
| 26 |
|
|---|
| 27 | # include <errno.h>
|
|---|
| 28 | # include <pthread.h>
|
|---|
| 29 | # include <stdlib.h>
|
|---|
| 30 |
|
|---|
| 31 | # if PTHREAD_IN_USE_DETECTION_HARD
|
|---|
| 32 |
|
|---|
| 33 | # if defined __FreeBSD__ || defined __DragonFly__ /* FreeBSD */
|
|---|
| 34 |
|
|---|
| 35 | /* Test using pthread_key_create. */
|
|---|
| 36 |
|
|---|
| 37 | int
|
|---|
| 38 | glthread_in_use (void)
|
|---|
| 39 | {
|
|---|
| 40 | static int tested;
|
|---|
| 41 | static int result; /* 1: linked with -lpthread, 0: only with libc */
|
|---|
| 42 |
|
|---|
| 43 | if (!tested)
|
|---|
| 44 | {
|
|---|
| 45 | pthread_key_t key;
|
|---|
| 46 | int err = pthread_key_create (&key, NULL);
|
|---|
| 47 |
|
|---|
| 48 | if (err == ENOSYS)
|
|---|
| 49 | result = 0;
|
|---|
| 50 | else
|
|---|
| 51 | {
|
|---|
| 52 | result = 1;
|
|---|
| 53 | if (err == 0)
|
|---|
| 54 | pthread_key_delete (key);
|
|---|
| 55 | }
|
|---|
| 56 | tested = 1;
|
|---|
| 57 | }
|
|---|
| 58 | return result;
|
|---|
| 59 | }
|
|---|
| 60 |
|
|---|
| 61 | # else /* Solaris, HP-UX */
|
|---|
| 62 |
|
|---|
| 63 | /* Test using pthread_create. */
|
|---|
| 64 |
|
|---|
| 65 | /* The function to be executed by a dummy thread. */
|
|---|
| 66 | static void *
|
|---|
| 67 | dummy_thread_func (void *arg)
|
|---|
| 68 | {
|
|---|
| 69 | return arg;
|
|---|
| 70 | }
|
|---|
| 71 |
|
|---|
| 72 | int
|
|---|
| 73 | glthread_in_use (void)
|
|---|
| 74 | {
|
|---|
| 75 | static int tested;
|
|---|
| 76 | static int result; /* 1: linked with -lpthread, 0: only with libc */
|
|---|
| 77 |
|
|---|
| 78 | if (!tested)
|
|---|
| 79 | {
|
|---|
| 80 | pthread_t thread;
|
|---|
| 81 |
|
|---|
| 82 | if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
|
|---|
| 83 | /* Thread creation failed. */
|
|---|
| 84 | result = 0;
|
|---|
| 85 | else
|
|---|
| 86 | {
|
|---|
| 87 | /* Thread creation works. */
|
|---|
| 88 | void *retval;
|
|---|
| 89 | if (pthread_join (thread, &retval) != 0)
|
|---|
| 90 | abort ();
|
|---|
| 91 | result = 1;
|
|---|
| 92 | }
|
|---|
| 93 | tested = 1;
|
|---|
| 94 | }
|
|---|
| 95 | return result;
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| 98 | # endif
|
|---|
| 99 |
|
|---|
| 100 | # endif
|
|---|
| 101 |
|
|---|
| 102 | #endif
|
|---|
| 103 |
|
|---|
| 104 | /* ========================================================================= */
|
|---|
| 105 |
|
|---|
| 106 | /* This declaration is solely to ensure that after preprocessing
|
|---|
| 107 | this file is never empty. */
|
|---|
| 108 | typedef int dummy;
|
|---|
