78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
// Copyright 2019 The MediaPipe 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 "mediapipe/framework/tool/simulation_clock.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/time/time.h"
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#include "mediapipe/framework/port/logging.h"
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namespace mediapipe {
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SimulationClock::~SimulationClock() {
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ThreadStart();
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ThreadFinish();
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}
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absl::Time SimulationClock::TimeNow() {
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absl::MutexLock l(&time_mutex_);
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return time_;
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}
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void SimulationClock::Sleep(absl::Duration d) {
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absl::MutexLock l(&time_mutex_);
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SleepInternal(time_ + d);
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}
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void SimulationClock::SleepUntil(absl::Time wakeup_time) {
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absl::MutexLock l(&time_mutex_);
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SleepInternal(wakeup_time);
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}
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void SimulationClock::SleepInternal(absl::Time wakeup_time) {
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Waiter waiter;
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waiters_.insert({wakeup_time, &waiter});
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num_running_--;
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TryAdvanceTime();
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while (waiter.sleeping) {
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waiter.cond.Wait(&time_mutex_);
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}
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num_running_++;
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}
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void SimulationClock::ThreadStart() {
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absl::MutexLock l(&time_mutex_);
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num_running_++;
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}
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void SimulationClock::ThreadFinish() {
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absl::MutexLock l(&time_mutex_);
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num_running_--;
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TryAdvanceTime();
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}
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void SimulationClock::TryAdvanceTime() {
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if (num_running_ == 0 && !waiters_.empty()) {
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VLOG(2) << "Advance time from: " << absl::ToUnixMicros(time_)
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<< " to: " << absl::ToUnixMicros(waiters_.begin()->first);
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time_ = waiters_.begin()->first;
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Waiter* waiter = waiters_.begin()->second;
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waiters_.erase(waiters_.begin());
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waiter->sleeping = false;
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waiter->cond.Signal();
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}
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}
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} // namespace mediapipe
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