Abseil Common Libraries (C++) (grcp 依赖)
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46 lines
1.4 KiB
46 lines
1.4 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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// This file is a Posix-specific part of spinlock_wait.cc |
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#include <sched.h> |
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#include <atomic> |
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#include <ctime> |
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#include "absl/base/internal/errno_saver.h" |
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#include "absl/base/internal/scheduling_mode.h" |
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#include "absl/base/port.h" |
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extern "C" { |
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ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay( |
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std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop, |
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absl::base_internal::SchedulingMode /* mode */) { |
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absl::base_internal::ErrnoSaver errno_saver; |
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if (loop == 0) { |
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} else if (loop == 1) { |
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sched_yield(); |
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} else { |
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struct timespec tm; |
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tm.tv_sec = 0; |
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tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop); |
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nanosleep(&tm, nullptr); |
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} |
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} |
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ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake( |
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std::atomic<uint32_t>* /* lock_word */, bool /* all */) {} |
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} // extern "C"
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