| | 1 | /* |
| | 2 | * Copyright (c) 2008-2013 Apple Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_APACHE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| | 7 | * you may not use this file except in compliance with the License. |
| | 8 | * You may obtain a copy of the License at |
| | 9 | * |
| | 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| | 11 | * |
| | 12 | * Unless required by applicable law or agreed to in writing, software |
| | 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| | 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| | 15 | * See the License for the specific language governing permissions and |
| | 16 | * limitations under the License. |
| | 17 | * |
| | 18 | * @APPLE_APACHE_LICENSE_HEADER_END@ |
| | 19 | */ |
| | 20 | |
| | 21 | #ifndef __OS_ONCE_PRIVATE__ |
| | 22 | #define __OS_ONCE_PRIVATE__ |
| | 23 | |
| | 24 | #include <Availability.h> |
| | 25 | #include <os/base_private.h> |
| | 26 | |
| | 27 | OS_ASSUME_NONNULL_BEGIN |
| | 28 | |
| | 29 | __BEGIN_DECLS |
| | 30 | |
| | 31 | #define OS_ONCE_SPI_VERSION 20130313 |
| | 32 | |
| | 33 | OS_SWIFT_UNAVAILABLE("Swift has lazy init") |
| | 34 | typedef long os_once_t; |
| | 35 | |
| | 36 | __OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0) |
| | 37 | OS_EXPORT OS_NONNULL1 OS_NONNULL3 OS_NOTHROW |
| | 38 | OS_SWIFT_UNAVAILABLE("Swift has lazy init") |
| | 39 | void |
| | 40 | _os_once(os_once_t *predicate, void *_Nullable context, os_function_t function); |
| | 41 | |
| | 42 | OS_NONNULL1 OS_NONNULL3 OS_NOTHROW |
| | 43 | __header_always_inline void |
| | 44 | os_once(os_once_t *predicate, void *_Nullable context, os_function_t function) |
| | 45 | { |
| | 46 | if (OS_EXPECT(*predicate, ~0l) != ~0l) { |
| | 47 | _os_once(predicate, context, function); |
| | 48 | OS_COMPILER_CAN_ASSUME(*predicate == ~0l); |
| | 49 | } else { |
| | 50 | os_compiler_barrier(); |
| | 51 | } |
| | 52 | } |
| | 53 | |
| | 54 | /* This SPI is *strictly* for the use of pthread_once only. This is not |
| | 55 | * safe in general use of os_once. |
| | 56 | */ |
| | 57 | __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0) |
| | 58 | OS_EXPORT OS_NONNULL1 OS_NOTHROW |
| | 59 | OS_SWIFT_UNAVAILABLE("Swift has lazy init") |
| | 60 | void |
| | 61 | __os_once_reset(os_once_t *val); |
| | 62 | |
| | 63 | __END_DECLS |
| | 64 | |
| | 65 | OS_ASSUME_NONNULL_END |
| | 66 | |
| | 67 | #endif // __OS_ONCE_PRIVATE__ |
projects / apple / libplatform.git / blame_incremental