64 lines
2.3 KiB
C++
64 lines
2.3 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_FRAMEWORK_THREAD_POOL_EXECUTOR_H_
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#define MEDIAPIPE_FRAMEWORK_THREAD_POOL_EXECUTOR_H_
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#include "mediapipe/framework/deps/thread_options.h"
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#include "mediapipe/framework/executor.h"
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#include "mediapipe/framework/port/statusor.h"
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#include "mediapipe/framework/port/threadpool.h"
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namespace mediapipe {
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// A multithreaded executor based on a thread pool.
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class ThreadPoolExecutor : public Executor {
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public:
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static absl::StatusOr<Executor*> Create(
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const MediaPipeOptions& extendable_options);
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explicit ThreadPoolExecutor(int num_threads);
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~ThreadPoolExecutor() override;
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void Schedule(std::function<void()> task) override;
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// For testing.
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int num_threads() const { return thread_pool_.num_threads(); }
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// Returns the thread stack size (in bytes).
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size_t stack_size() const { return stack_size_; }
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private:
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ThreadPoolExecutor(const ThreadOptions& thread_options, int num_threads);
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// Saves the value of the stack size option and starts the thread pool.
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void Start();
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mediapipe::ThreadPool thread_pool_;
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// Records the stack size in ThreadOptions right before we call
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// thread_pool_.StartWorkers().
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//
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// The actual stack size passed to pthread_attr_setstacksize() for the
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// worker threads differs from the stack size we specified. It includes the
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// guard size and space for thread-local storage. (See Thread::Start() in
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// thread/thread.cc.) So the unit tests check the stack size in
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// ThreadOptions, in addition to trying to recover the specified stack
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// size from the stack size returned by pthread_getattr_np(),
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// pthread_attr_getstacksize(), and pthread_attr_getguardsize().
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size_t stack_size_ = 0;
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_FRAMEWORK_THREAD_POOL_EXECUTOR_H_
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