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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/synchronization/notification.h"
#include <atomic>
#include "absl/base/attributes.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/synchronization/mutex.h"
#include "absl/time/time.h"
namespace absl {
void Notification::Notify() {
MutexLock l(&this->mutex_);
#ifndef NDEBUG
if (ABSL_PREDICT_FALSE(notified_yet_.load(std::memory_order_relaxed))) {
ABSL_RAW_LOG(
FATAL,
"Notify() method called more than once for Notification object %p",
static_cast<void *>(this));
}
#endif
notified_yet_.store(true, std::memory_order_release);
}
Notification::~Notification() {
// Make sure that the thread running Notify() exits before the object is
// destructed.
MutexLock l(&this->mutex_);
}
static inline bool HasBeenNotifiedInternal(
const std::atomic<bool> *notified_yet) {
return notified_yet->load(std::memory_order_acquire);
}
bool Notification::HasBeenNotified() const {
return HasBeenNotifiedInternal(&this->notified_yet_);
}
void Notification::WaitForNotification() const {
if (!HasBeenNotifiedInternal(&this->notified_yet_)) {
this->mutex_.LockWhen(Condition(&HasBeenNotifiedInternal,
&this->notified_yet_));
this->mutex_.Unlock();
}
}
bool Notification::WaitForNotificationWithTimeout(
absl::Duration timeout) const {
bool notified = HasBeenNotifiedInternal(&this->notified_yet_);
if (!notified) {
notified = this->mutex_.LockWhenWithTimeout(
Condition(&HasBeenNotifiedInternal, &this->notified_yet_), timeout);
this->mutex_.Unlock();
}
return notified;
}
bool Notification::WaitForNotificationWithDeadline(absl::Time deadline) const {
bool notified = HasBeenNotifiedInternal(&this->notified_yet_);
if (!notified) {
notified = this->mutex_.LockWhenWithDeadline(
Condition(&HasBeenNotifiedInternal, &this->notified_yet_), deadline);
this->mutex_.Unlock();
}
return notified;
}
} // namespace absl
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