/*
* Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "objfw-defs.h"
#import "macros.h"
/** @file */
#if defined(OF_HAVE_PTHREADS)
# include <pthread.h>
typedef pthread_once_t OFOnceControl;
# define OFOnceControlInitValue PTHREAD_ONCE_INIT
#elif defined(OF_HAVE_ATOMIC_OPS)
typedef volatile int OFOnceControl;
# define OFOnceControlInitValue 0
#elif defined(OF_AMIGAOS) || !defined(OF_HAVE_THREADS)
typedef int OFOnceControl;
# define OFOnceControlInitValue 0
#endif
typedef void (*OFOnceFunction)(void);
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief A method to call a function only once in a thread-safe manner.
*
* @param control The once control. This needs to be set to
* OFOnceControlInitValue at compile time.
* @param func The function to call only once
*/
extern void OFOnce(OFOnceControl *_Nonnull control,
OFOnceFunction _Nonnull func);
#ifdef __cplusplus
}
#endif