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| 1 | //===-- Types related to the callonce function ----------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_LIBC_SRC___SUPPORT_THREADS_CALLONCE_H |
| 10 | #define LLVM_LIBC_SRC___SUPPORT_THREADS_CALLONCE_H |
| 11 | |
| 12 | #include "src/__support/macros/config.h" |
| 13 | #include "src/__support/macros/optimization.h" // LIBC_LIKELY |
| 14 | |
| 15 | // Plaform specific routines, provides: |
| 16 | // - OnceFlag definition |
| 17 | // - callonce_impl::callonce_fastpath for fast path check |
| 18 | // - callonce_impl::callonce_slowpath for slow path execution |
| 19 | #ifdef __linux__ |
| 20 | #include "src/__support/threads/linux/callonce.h" |
| 21 | #else |
| 22 | #error "callonce is not supported on this platform" |
| 23 | #endif |
| 24 | |
| 25 | namespace LIBC_NAMESPACE_DECL { |
| 26 | |
| 27 | // Common definitions |
| 28 | using CallOnceCallback = void(void); |
| 29 | namespace callonce_impl { |
| 30 | int callonce_slowpath(CallOnceFlag *flag, CallOnceCallback *callback); |
| 31 | } // namespace callonce_impl |
| 32 | |
| 33 | LIBC_INLINE int callonce(CallOnceFlag *flag, CallOnceCallback *callback) { |
| 34 | if (LIBC_LIKELY(callonce_impl::callonce_fastpath(flag))) |
| 35 | return 0; |
| 36 | |
| 37 | return callonce_impl::callonce_slowpath(flag, callback); |
| 38 | } |
| 39 | } // namespace LIBC_NAMESPACE_DECL |
| 40 | |
| 41 | #endif // LLVM_LIBC_SRC___SUPPORT_THREADS_CALLONCE_H |
| 42 |
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