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/* Creating and controlling POSIX threads.
Copyright (C) 2010-2023 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 Paul Eggert, 2010, and Bruno Haible <bruno@clisp.org>, 2019. */
#include <config.h>
/* Specification. */
#include <pthread.h>
#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
# include "windows-thread.h"
#else
# include <stdlib.h>
#endif
typedef void * (* pthread_main_function_t) (void *);
#if ((defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS) || !HAVE_PTHREAD_H
int
pthread_attr_init (pthread_attr_t *attr)
{
*attr = PTHREAD_CREATE_JOINABLE;
return 0;
}
int
pthread_attr_getdetachstate (const pthread_attr_t *attr, int *detachstatep)
{
*detachstatep = *attr & (PTHREAD_CREATE_JOINABLE | PTHREAD_CREATE_DETACHED);
return 0;
}
int
pthread_attr_setdetachstate (pthread_attr_t *attr, int detachstate)
{
if (!(detachstate == PTHREAD_CREATE_JOINABLE
|| detachstate == PTHREAD_CREATE_DETACHED))
return EINVAL;
*attr ^= (*attr ^ detachstate)
& (PTHREAD_CREATE_JOINABLE | PTHREAD_CREATE_DETACHED);
return 0;
}
int
pthread_attr_destroy (_GL_UNUSED pthread_attr_t *attr)
{
return 0;
}
#endif
#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
/* Use Windows threads. */
int
pthread_create (pthread_t *threadp, const pthread_attr_t *attr,
pthread_main_function_t mainfunc, void *arg)
{
unsigned int glwthread_attr =
(attr != NULL
&& (*attr & (PTHREAD_CREATE_JOINABLE | PTHREAD_CREATE_DETACHED))
!= PTHREAD_CREATE_JOINABLE
? GLWTHREAD_ATTR_DETACHED
: 0);
return glwthread_thread_create (threadp, glwthread_attr, mainfunc, arg);
}
pthread_t
pthread_self (void)
{
return glwthread_thread_self ();
}
int
pthread_equal (pthread_t thread1, pthread_t thread2)
{
return thread1 == thread2;
}
int
pthread_detach (pthread_t thread)
{
return glwthread_thread_detach (thread);
}
int
pthread_join (pthread_t thread, void **valuep)
{
return glwthread_thread_join (thread, valuep);
}
void
pthread_exit (void *value)
{
glwthread_thread_exit (value);
}
#elif HAVE_PTHREAD_H
/* Provide workarounds for POSIX threads. */
# if PTHREAD_CREATE_IS_INLINE
int
pthread_create (pthread_t *threadp, const pthread_attr_t *attr,
pthread_main_function_t mainfunc, void *arg)
# undef pthread_create
{
return pthread_create (threadp, attr, mainfunc, arg);
}
int
pthread_attr_init (pthread_attr_t *attr)
# undef pthread_attr_init
{
return pthread_attr_init (attr);
}
# endif
#else
/* Provide a dummy implementation for single-threaded applications. */
int
pthread_create (pthread_t *threadp, const pthread_attr_t *attr,
pthread_main_function_t mainfunc, void *arg)
{
/* The maximum number of threads is reached. Do not create a thread. */
return EAGAIN;
}
pthread_t
pthread_self (void)
{
return 42;
}
int
pthread_equal (pthread_t thread1, pthread_t thread2)
{
return thread1 == thread2;
}
int
pthread_detach (pthread_t thread)
{
/* There are no joinable threads. */
return EINVAL;
}
int
pthread_join (pthread_t thread, void **valuep)
{
/* There are no joinable threads. */
return EINVAL;
}
void
pthread_exit (void *value)
{
/* There is just one thread, so the process exits. */
exit (0);
}
#endif
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