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Man Pages


Manual Reference Pages  -  DISPATCH_ONCE (3)

NAME

dispatch_once - execute a block only once

CONTENTS

Synopsis
Description
Fundamentals
See Also

SYNOPSIS


.Fd #include <dispatch/dispatch.h> void
.Fo dispatch_once dispatch_once_t *predicate void (^block)(void)
.Fc void
.Fo dispatch_once_f dispatch_once_t *predicate void *context void (*function)(void *)
.Fc

DESCRIPTION

The dispatch_once function provides a simple and efficient mechanism to run an initializer exactly once, similar to pthread_once(3). Well designed code hides the use of lazy initialization. For example:
FILE *getlogfile(void)
{
        static dispatch_once_t pred;
        static FILE *logfile;

        dispatch_once(&pred, ^{                 logfile = fopen(MY_LOG_FILE, "a");         });

        return logfile; }

FUNDAMENTALS

The dispatch_once function is a wrapper around dispatch_once_f.

SEE ALSO

dispatch(3)
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