/* * Copyright (c) 2012-2013 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #ifndef __OS_ALLOC_ONCE_IMPL__ #define __OS_ALLOC_ONCE_IMPL__ #ifndef __OS_ALLOC_INDIRECT__ #error "Please include <os/alloc_once_private.h> instead of this file directly." #endif #include <Availability.h> #include <sys/types.h> #include <os/base_private.h> #include <os/once_private.h> __BEGIN_DECLS #define OS_ALLOC_SPI_VERSION 20120430 #define OS_ALLOC_ONCE_KEY_MAX 100 typedef os_once_t os_alloc_token_t; struct _os_alloc_once_s { os_alloc_token_t once; void *ptr; }; __OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_6_0) extern struct _os_alloc_once_s _os_alloc_once_table[]; __OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_6_0) OS_EXPORT OS_NONNULL1 void* _os_alloc_once(struct _os_alloc_once_s *slot, size_t sz, os_function_t init); /* * The region allocated by os_alloc_once is 0-filled when initially * returned (or handed off to the initializer). */ OS_WARN_RESULT OS_NOTHROW OS_CONST __header_always_inline void* os_alloc_once(os_alloc_token_t token, size_t sz, os_function_t init) { struct _os_alloc_once_s *slot = &_os_alloc_once_table[token]; if (OS_EXPECT(slot->once, ~0l) != ~0l) { void *ptr = _os_alloc_once(slot, sz, init); OS_COMPILER_CAN_ASSUME(slot->once == ~0l); return ptr; } return slot->ptr; } __END_DECLS #endif // __OS_ALLOC_ONCE_IMPL__