179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/* Creating and controlling POSIX threads.
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Copyright (C) 2010-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU 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 Paul Eggert, 2010, and Bruno Haible <bruno@clisp.org>, 2019. */
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#include <config.h>
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/* Specification. */
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#include <pthread.h>
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#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
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# include "windows-thread.h"
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#else
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# include <stdlib.h>
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#endif
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typedef void * (* pthread_main_function_t) (void *);
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#if ((defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS) || !HAVE_PTHREAD_H
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int
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pthread_attr_init (pthread_attr_t *attr)
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{
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*attr = PTHREAD_CREATE_JOINABLE;
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return 0;
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}
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int
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pthread_attr_getdetachstate (const pthread_attr_t *attr, int *detachstatep)
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{
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*detachstatep = *attr & (PTHREAD_CREATE_JOINABLE | PTHREAD_CREATE_DETACHED);
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return 0;
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}
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int
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pthread_attr_setdetachstate (pthread_attr_t *attr, int detachstate)
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{
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if (!(detachstate == PTHREAD_CREATE_JOINABLE
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|| detachstate == PTHREAD_CREATE_DETACHED))
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return EINVAL;
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*attr ^= (*attr ^ detachstate)
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& (PTHREAD_CREATE_JOINABLE | PTHREAD_CREATE_DETACHED);
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return 0;
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}
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int
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pthread_attr_destroy (pthread_attr_t *attr _GL_UNUSED)
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{
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return 0;
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}
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#endif
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#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
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/* Use Windows threads. */
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int
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pthread_create (pthread_t *threadp, const pthread_attr_t *attr,
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pthread_main_function_t mainfunc, void *arg)
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{
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unsigned int glwthread_attr =
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(attr != NULL
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&& (*attr & (PTHREAD_CREATE_JOINABLE | PTHREAD_CREATE_DETACHED))
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!= PTHREAD_CREATE_JOINABLE
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? GLWTHREAD_ATTR_DETACHED
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: 0);
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return glwthread_thread_create (threadp, glwthread_attr, mainfunc, arg);
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}
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pthread_t
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pthread_self (void)
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{
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return glwthread_thread_self ();
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}
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int
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pthread_equal (pthread_t thread1, pthread_t thread2)
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{
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return thread1 == thread2;
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}
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int
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pthread_detach (pthread_t thread)
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{
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return glwthread_thread_detach (thread);
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}
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int
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pthread_join (pthread_t thread, void **valuep)
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{
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return glwthread_thread_join (thread, valuep);
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}
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void
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pthread_exit (void *value)
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{
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glwthread_thread_exit (value);
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}
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#elif HAVE_PTHREAD_H
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/* Provide workarounds for POSIX threads. */
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# if PTHREAD_CREATE_IS_INLINE
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int
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pthread_create (pthread_t *threadp, const pthread_attr_t *attr,
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pthread_main_function_t mainfunc, void *arg)
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# undef pthread_create
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{
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return pthread_create (threadp, attr, mainfunc, arg);
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}
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int
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pthread_attr_init (pthread_attr_t *attr)
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# undef pthread_attr_init
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{
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return pthread_attr_init (attr);
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}
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# endif
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#else
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/* Provide a dummy implementation for single-threaded applications. */
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int
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pthread_create (pthread_t *threadp, const pthread_attr_t *attr,
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pthread_main_function_t mainfunc, void *arg)
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{
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/* The maximum number of threads is reached. Do not create a thread. */
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return EAGAIN;
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}
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pthread_t
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pthread_self (void)
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{
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return 42;
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}
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int
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pthread_equal (pthread_t thread1, pthread_t thread2)
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{
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return thread1 == thread2;
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}
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int
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pthread_detach (pthread_t thread)
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{
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/* There are no joinable threads. */
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return EINVAL;
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}
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int
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pthread_join (pthread_t thread, void **valuep)
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{
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/* There are no joinable threads. */
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return EINVAL;
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}
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void
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pthread_exit (void *value)
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{
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/* There is just one thread, so the process exits. */
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exit (0);
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}
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#endif
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