ObjFW  Diff

/*
 * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
 * Copyright (c) 2008-2022 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.
 *

typedef void (*OFOnceFunction)(void);

#ifdef __cplusplus
extern "C" {
#endif
/**
 * @brief A method to call a function only once in a thread-safe manner.
 * @brief Executes the specified function exactly once in the application's
 *	  lifetime, even in a multi-threaded environment.
 *
 * @param control The once control. This needs to be set to
 *	  OFOnceControlInitValue at compile time.
 * @param func The function to call only once
 * @param control An OFOnceControl. This should be a static variable
 *		  preinitialized to `OFOnceControlInitValue`.
 * @param function The function to execute once
 */
extern void OFOnce(OFOnceControl *_Nonnull control,
extern void OFOnce(OFOnceControl *control, void (*function)(void));
    OFOnceFunction _Nonnull func);
#ifdef __cplusplus
}
#endif