ObjFW  Check-in [28230080b3]

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Comment:Make OFOnce() public
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SHA3-256: 28230080b3888888c63a3cfca4822f590f48d2a756946df6787ca604a13842c2
User & Date: js on 2022-06-18 17:30:36
Other Links: manifest | tags
Context
2022-06-18
17:41
Remove OFThreadPool check-in: 06763e3c67 user: js tags: trunk
17:30
Make OFOnce() public check-in: 28230080b3 user: js tags: trunk
01:07
OFPlugin: Fix accidentally removed = check-in: c96f67f694 user: js tags: trunk
Changes
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Modified src/OFOnce.h from [fee56e64fa] to [3af1572f79].

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typedef int OFOnceControl;
# define OFOnceControlInitValue 0
#endif

#ifdef __cplusplus
extern "C" {
#endif








extern void OFOnce(OFOnceControl *control, void (*func)(void));
#ifdef __cplusplus
}
#endif








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typedef int OFOnceControl;
# define OFOnceControlInitValue 0
#endif

#ifdef __cplusplus
extern "C" {
#endif
/**
 * @brief Executes the specified function exactly once in the application's
 *	  lifetime, even in a multi-threaded environment.
 *
 * @param control An OFOnceControl. This should be a static variable
 *		  preinitialized to `OFOnceControlInitValue`.
 * @param function The function to execute once
 */
extern void OFOnce(OFOnceControl *control, void (*function)(void));
#ifdef __cplusplus
}
#endif

Modified src/OFOnce.m from [a3ef1477f9] to [72d5ba7049].

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#endif

#ifdef OF_AMIGAOS
# include <proto/exec.h>
#endif

void
OFOnce(OFOnceControl *control, void (*func)(void))
{
#if !defined(OF_HAVE_THREADS)
	if (*control == 0) {
		func();
		*control = 1;
	}
#elif defined(OF_HAVE_PTHREADS)
	pthread_once(control, func);
#elif defined(OF_HAVE_ATOMIC_OPS)
	/* Avoid atomic operations in case it's already done. */
	if (*control == 2)
		return;

	if (OFAtomicIntCompareAndSwap(control, 0, 1)) {
		func();

		OFMemoryBarrier();

		OFAtomicIntIncrease(control);
	} else
		while (*control == 1)
			OFYieldThread();








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#endif

#ifdef OF_AMIGAOS
# include <proto/exec.h>
#endif

void
OFOnce(OFOnceControl *control, void (*function)(void))
{
#if !defined(OF_HAVE_THREADS)
	if (*control == 0) {
		function();
		*control = 1;
	}
#elif defined(OF_HAVE_PTHREADS)
	pthread_once(control, function);
#elif defined(OF_HAVE_ATOMIC_OPS)
	/* Avoid atomic operations in case it's already done. */
	if (*control == 2)
		return;

	if (OFAtomicIntCompareAndSwap(control, 0, 1)) {
		function();

		OFMemoryBarrier();

		OFAtomicIntIncrease(control);
	} else
		while (*control == 1)
			OFYieldThread();
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			Forbid();
		}
	}

	Permit();

	if (run) {
		func();
		*control = 2;
	}
#else
# error No OFOnce available
#endif
}








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			Forbid();
		}
	}

	Permit();

	if (run) {
		function();
		*control = 2;
	}
#else
# error No OFOnce available
#endif
}

Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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