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/* POSIX once-only control.
Copyright (C) 2019-2021 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>, 2019. */
#include <config.h>
/* Specification. */
#include <pthread.h>
#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
# include "windows-once.h"
#endif
#if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
/* Use Windows threads. */
int
pthread_once (pthread_once_t *once_control, void (*initfunction) (void))
{
glwthread_once (once_control, initfunction);
return 0;
}
#elif HAVE_PTHREAD_H
/* Provide workarounds for POSIX threads. */
#else
/* Provide a dummy implementation for single-threaded applications. */
int
pthread_once (pthread_once_t *once_control, void (*initfunction) (void))
{
if (*once_control == 0)
{
*once_control = ~ 0;
initfunction ();
}
return 0;
}
#endif
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