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62 lines
2.1 KiB
62 lines
2.1 KiB
/*
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* Copyright (C) 2016 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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namespace android {
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// T is FastMixer or FastCapture
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template<typename T> class AutoPark {
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public:
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// Park the specific FastThread, which can be nullptr, in hot idle if not currently idling
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explicit AutoPark(const sp<T>& fastThread) : mFastThread(fastThread)
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{
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mPreviousCommand = FastThreadState::HOT_IDLE;
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if (fastThread != nullptr) {
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auto sq = mFastThread->sq();
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FastThreadState *state = sq->begin();
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if (!(state->mCommand & FastThreadState::IDLE)) {
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mPreviousCommand = state->mCommand;
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state->mCommand = FastThreadState::HOT_IDLE;
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sq->end();
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sq->push(sq->BLOCK_UNTIL_ACKED);
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} else {
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sq->end(false /*didModify*/);
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}
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}
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}
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// Remove the FastThread from hot idle if necessary
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~AutoPark()
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{
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if (!(mPreviousCommand & FastThreadState::IDLE)) {
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ALOG_ASSERT(mFastThread != nullptr);
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auto sq = mFastThread->sq();
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FastThreadState *state = sq->begin();
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ALOG_ASSERT(state->mCommand == FastThreadState::HOT_IDLE);
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state->mCommand = mPreviousCommand;
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sq->end();
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sq->push(sq->BLOCK_UNTIL_PUSHED);
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}
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}
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private:
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const sp<T> mFastThread;
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// if !&IDLE, holds the FastThread state to restore after new parameters processed
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FastThreadState::Command mPreviousCommand;
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}; // class AutoPark
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} // namespace
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