spinlock_win32.inc (1369B)
1 // Copyright 2017 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 // This file is a Win32-specific part of spinlock_wait.cc 16 17 #include <windows.h> 18 #include <atomic> 19 #include "absl/base/internal/scheduling_mode.h" 20 21 extern "C" { 22 23 void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)( 24 std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop, 25 absl::base_internal::SchedulingMode /* mode */) { 26 if (loop == 0) { 27 } else if (loop == 1) { 28 Sleep(0); 29 } else { 30 // SpinLockSuggestedDelayNS() always returns a positive integer, so this 31 // static_cast is safe. 32 Sleep(static_cast<DWORD>( 33 absl::base_internal::SpinLockSuggestedDelayNS(loop) / 1000000)); 34 } 35 } 36 37 void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)( 38 std::atomic<uint32_t>* /* lock_word */, bool /* all */) {} 39 40 } // extern "C"