1*bb722a7dSDimitry Andric //===-- Types related to the callonce function ----------------------------===// 2*bb722a7dSDimitry Andric // 3*bb722a7dSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*bb722a7dSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*bb722a7dSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*bb722a7dSDimitry Andric // 7*bb722a7dSDimitry Andric //===----------------------------------------------------------------------===// 8*bb722a7dSDimitry Andric 9*bb722a7dSDimitry Andric #ifndef LLVM_LIBC_SRC___SUPPORT_THREADS_CALLONCE_H 10*bb722a7dSDimitry Andric #define LLVM_LIBC_SRC___SUPPORT_THREADS_CALLONCE_H 11*bb722a7dSDimitry Andric 12*bb722a7dSDimitry Andric #include "src/__support/macros/config.h" 13*bb722a7dSDimitry Andric #include "src/__support/macros/optimization.h" // LIBC_LIKELY 14*bb722a7dSDimitry Andric 15*bb722a7dSDimitry Andric // Plaform specific routines, provides: 16*bb722a7dSDimitry Andric // - OnceFlag definition 17*bb722a7dSDimitry Andric // - callonce_impl::callonce_fastpath for fast path check 18*bb722a7dSDimitry Andric // - callonce_impl::callonce_slowpath for slow path execution 19*bb722a7dSDimitry Andric #ifdef __linux__ 20*bb722a7dSDimitry Andric #include "src/__support/threads/linux/callonce.h" 21*bb722a7dSDimitry Andric #else 22*bb722a7dSDimitry Andric #error "callonce is not supported on this platform" 23*bb722a7dSDimitry Andric #endif 24*bb722a7dSDimitry Andric 25*bb722a7dSDimitry Andric namespace LIBC_NAMESPACE_DECL { 26*bb722a7dSDimitry Andric 27*bb722a7dSDimitry Andric // Common definitions 28*bb722a7dSDimitry Andric using CallOnceCallback = void(void); 29*bb722a7dSDimitry Andric namespace callonce_impl { 30*bb722a7dSDimitry Andric int callonce_slowpath(CallOnceFlag *flag, CallOnceCallback *callback); 31*bb722a7dSDimitry Andric } // namespace callonce_impl 32*bb722a7dSDimitry Andric callonce(CallOnceFlag * flag,CallOnceCallback * callback)33*bb722a7dSDimitry AndricLIBC_INLINE int callonce(CallOnceFlag *flag, CallOnceCallback *callback) { 34*bb722a7dSDimitry Andric if (LIBC_LIKELY(callonce_impl::callonce_fastpath(flag))) 35*bb722a7dSDimitry Andric return 0; 36*bb722a7dSDimitry Andric 37*bb722a7dSDimitry Andric return callonce_impl::callonce_slowpath(flag, callback); 38*bb722a7dSDimitry Andric } 39*bb722a7dSDimitry Andric } // namespace LIBC_NAMESPACE_DECL 40*bb722a7dSDimitry Andric 41*bb722a7dSDimitry Andric #endif // LLVM_LIBC_SRC___SUPPORT_THREADS_CALLONCE_H 42