Abseil Common Libraries (C++) (grcp 依赖)
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85 lines
2.5 KiB
85 lines
2.5 KiB
7 years ago
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// 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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// http://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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#include "absl/synchronization/notification.h"
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#include <atomic>
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#include "absl/base/attributes.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/time/time.h"
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namespace absl {
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void Notification::Notify() {
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MutexLock l(&this->mutex_);
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#ifndef NDEBUG
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if (ABSL_PREDICT_FALSE(notified_yet_.load(std::memory_order_relaxed))) {
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ABSL_RAW_LOG(
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FATAL,
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"Notify() method called more than once for Notification object %p",
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static_cast<void *>(this));
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}
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#endif
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notified_yet_.store(true, std::memory_order_release);
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}
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Notification::~Notification() {
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// Make sure that the thread running Notify() exits before the object is
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// destructed.
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MutexLock l(&this->mutex_);
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}
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static inline bool HasBeenNotifiedInternal(
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const std::atomic<bool> *notified_yet) {
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return notified_yet->load(std::memory_order_acquire);
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}
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bool Notification::HasBeenNotified() const {
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return HasBeenNotifiedInternal(&this->notified_yet_);
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}
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void Notification::WaitForNotification() const {
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if (!HasBeenNotifiedInternal(&this->notified_yet_)) {
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this->mutex_.LockWhen(Condition(&HasBeenNotifiedInternal,
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&this->notified_yet_));
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this->mutex_.Unlock();
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}
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}
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bool Notification::WaitForNotificationWithTimeout(
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absl::Duration timeout) const {
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bool notified = HasBeenNotifiedInternal(&this->notified_yet_);
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if (!notified) {
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notified = this->mutex_.LockWhenWithTimeout(
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Condition(&HasBeenNotifiedInternal, &this->notified_yet_), timeout);
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this->mutex_.Unlock();
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}
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return notified;
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}
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bool Notification::WaitForNotificationWithDeadline(absl::Time deadline) const {
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bool notified = HasBeenNotifiedInternal(&this->notified_yet_);
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if (!notified) {
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notified = this->mutex_.LockWhenWithDeadline(
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Condition(&HasBeenNotifiedInternal, &this->notified_yet_), deadline);
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this->mutex_.Unlock();
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}
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return notified;
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}
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} // namespace absl
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