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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#ifndef MEDIAPIPE_GPU_GL_THREAD_COLLECTOR_H_
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#define MEDIAPIPE_GPU_GL_THREAD_COLLECTOR_H_
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#include <cstdlib>
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#if defined(MEDIAPIPE_USING_SWIFTSHADER)
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#define MEDIAPIPE_NEEDS_GL_THREAD_COLLECTOR 1
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#endif
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#if MEDIAPIPE_NEEDS_GL_THREAD_COLLECTOR
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#include "absl/synchronization/mutex.h"
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#include "mediapipe/framework/deps/no_destructor.h"
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#endif // MEDIAPIPE_NEEDS_GL_THREAD_COLLECTOR
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namespace mediapipe {
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#if MEDIAPIPE_NEEDS_GL_THREAD_COLLECTOR
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class GlThreadCollector {
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public:
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static void ThreadStarting() { Collector().ChangeCount(1); }
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static void ThreadEnding() { Collector().ChangeCount(-1); }
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private:
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GlThreadCollector() { std::atexit(WaitForThreadsToTerminate); }
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static GlThreadCollector& Collector() {
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static NoDestructor<GlThreadCollector> collector;
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return *collector;
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}
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static void WaitForThreadsToTerminate() { Collector().Wait(); }
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void ChangeCount(int delta) {
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absl::MutexLock l(&mutex_);
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active_threads_ += delta;
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}
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void Wait() {
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auto done = [this]() {
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mutex_.AssertReaderHeld();
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return active_threads_ == 0;
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};
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absl::MutexLock l(&mutex_);
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mutex_.Await(absl::Condition(&done));
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}
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absl::Mutex mutex_;
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int active_threads_ ABSL_GUARDED_BY(mutex_) = 0;
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friend NoDestructor<GlThreadCollector>;
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};
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#else
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class GlThreadCollector {
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public:
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static void ThreadStarting() {}
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static void ThreadEnding() {}
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};
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#endif // MEDIAPIPE_NEEDS_GL_THREAD_COLLECTOR
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} // namespace mediapipe
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#endif // MEDIAPIPE_GPU_GL_THREAD_COLLECTOR_H_
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