include/libdispatch/once.h File Reference

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Typedefs
typedef long	dispatch_once_t
Functions
DISPATCH_EXPORT DISPATCH_NONNULL1 DISPATCH_NONNULL3 DISPATCH_NOTHROW void	dispatch_once_f (dispatch_once_t *predicate, void *context, void(*function)(void *))

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Typedef Documentation

typedef long dispatch_once_t

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Function Documentation

DISPATCH_EXPORT DISPATCH_NONNULL1 DISPATCH_NONNULL3 DISPATCH_NOTHROW void dispatch_once_f	(	dispatch_once_t *	predicate,
		void *	context,
		void(*)(void *)	function
	)

dispatch_once

Execute a block once and only once.

Parameters:

predicate	A pointer to a dispatch_once_t that is used to test whether the block has completed or not.
block	The block to execute once.

Always call dispatch_once() before using or testing any variables that are initialized by the block.