once.h

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/*
 * Copyright (c) 2008-2009 Apple Inc. All rights reserved.
 *
 * @APPLE_APACHE_LICENSE_HEADER_START@
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * @APPLE_APACHE_LICENSE_HEADER_END@
 */

#ifndef __DISPATCH_ONCE__
#define __DISPATCH_ONCE__

#ifndef __DISPATCH_INDIRECT__
#error "Please #include <dispatch/dispatch.h> instead of this file directly."
#include "base.h" // for HeaderDoc
#endif

__DISPATCH_BEGIN_DECLS

typedef intptr_t dispatch_once_t;

#ifdef __BLOCKS__

DISPATCH_EXPORT  
void
dispatch_once(dispatch_once_t *predicate, dispatch_block_t block);
#ifdef __GNUC__
#define dispatch_once(x, ...) do { if (__builtin_expect(*(x), ~0l) != ~0l) dispatch_once((x), (__VA_ARGS__)); } while (0)
#endif
#endif


DISPATCH_EXPORT   
void
dispatch_once_f(dispatch_once_t *predicate, void *context, void (*function)(void *));
#ifdef __GNUC__
#define dispatch_once_f(x, y, z) do { if (__builtin_expect(*(x), ~0l) != ~0l) dispatch_once_f((x), (y), (z)); } while (0)
#endif

__DISPATCH_END_DECLS

#endif