65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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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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*/
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#ifndef HARDWARE_INTERFACES_CAMERA_COMMON_SIMPLETHREAD_H_
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#define HARDWARE_INTERFACES_CAMERA_COMMON_SIMPLETHREAD_H_
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#include <thread>
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namespace android {
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namespace hardware {
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namespace camera {
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namespace common {
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namespace helper {
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// A simple looper based on std::thread.
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class SimpleThread {
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public:
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SimpleThread();
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virtual ~SimpleThread();
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// Explicit call to start execution of the thread. No thread is created before this function
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// is called.
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virtual void run() final;
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virtual void requestExitAndWait() final;
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protected:
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// Main logic of the thread. This function is called repeatedly until it returns false.
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// Thread execution stops if this function returns false.
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virtual bool threadLoop() = 0;
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// Returns true if the thread execution should stop. Should be used by threadLoop to check if
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// the thread has been requested to exit.
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virtual inline bool exitPending() final { return mDone.load(std::memory_order_acquire); }
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private:
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// Wraps threadLoop in a simple while loop that allows safe exit
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virtual void runLoop() final;
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// Flag to signal end of thread execution. This flag is checked before every iteration
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// of threadLoop.
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std::atomic_bool mDone;
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std::thread mThread;
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};
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} // namespace helper
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} // namespace common
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} // namespace camera
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} // namespace hardware
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} // namespace android
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#endif // HARDWARE_INTERFACES_CAMERA_COMMON_SIMPLETHREAD_H_
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