109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
|
/* Multithreading primitives.
|
||
|
|
Copyright (C) 2005-2023 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This file is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2.1 of the
|
||
|
|
License, or (at your option) any later version.
|
||
|
|
|
||
|
|
This file 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 Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
/* ========================================================================= */
|
||
|
|
|
||
|
|
#if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
|
||
|
|
|
||
|
|
/* Use the POSIX threads library. */
|
||
|
|
|
||
|
|
# include <errno.h>
|
||
|
|
# include <pthread.h>
|
||
|
|
# include <stdlib.h>
|
||
|
|
|
||
|
|
# if PTHREAD_IN_USE_DETECTION_HARD
|
||
|
|
|
||
|
|
# if defined __FreeBSD__ || defined __DragonFly__ /* FreeBSD */
|
||
|
|
|
||
|
|
/* Test using pthread_key_create. */
|
||
|
|
|
||
|
|
int
|
||
|
|
glthread_in_use (void)
|
||
|
|
{
|
||
|
|
static int tested;
|
||
|
|
static int result; /* 1: linked with -lpthread, 0: only with libc */
|
||
|
|
|
||
|
|
if (!tested)
|
||
|
|
{
|
||
|
|
pthread_key_t key;
|
||
|
|
int err = pthread_key_create (&key, NULL);
|
||
|
|
|
||
|
|
if (err == ENOSYS)
|
||
|
|
result = 0;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
result = 1;
|
||
|
|
if (err == 0)
|
||
|
|
pthread_key_delete (key);
|
||
|
|
}
|
||
|
|
tested = 1;
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
# else /* Solaris, HP-UX */
|
||
|
|
|
||
|
|
/* Test using pthread_create. */
|
||
|
|
|
||
|
|
/* 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
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* ========================================================================= */
|
||
|
|
|
||
|
|
/* This declaration is solely to ensure that after preprocessing
|
||
|
|
this file is never empty. */
|
||
|
|
typedef int dummy;
|