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 21extern "C" { 22 23void 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 37void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)( 38 std::atomic<uint32_t>* /* lock_word */, bool /* all */) {} 39 40} // extern "C" 41