3fedf5a7e2
Test: compiles and links Bug: 150782769 Change-Id: Ib49c1bf914b6bfaad1fb29371115df7c9eec08d2
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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* Copyright (C) 2013 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 RENDERTASK_H_
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#define RENDERTASK_H_
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#include <cutils/compiler.h>
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#include <utils/Timers.h>
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namespace android {
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class Mutex;
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class Condition;
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namespace uirenderer {
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namespace renderthread {
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#define METHOD_INVOKE_PAYLOAD_SIZE (8 * sizeof(void*))
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/*
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* Notes about memory management
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*
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* RenderThread will only invoke RenderTask::run(). It is the responsibility
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* of the RenderTask to know if it needs to suicide at the end of run() or
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* if some other lifecycle is being used. As such, it is not valid to reference
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* anything on RenderTask after the first call to run().
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*
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* For example SignalingRenderTask
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* is expected to be stack allocated by the calling thread, so it does not
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* suicide in run() but instead relies on the caller to destroy it.
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*
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* MethodInvokeRenderTask however is currently allocated with new, so it will
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* suicide at the end of run(). TODO: Replace this with a small pool to avoid
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* malloc/free churn of small objects?
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*/
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class RenderTask {
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public:
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RenderTask() : mNext(nullptr), mRunAt(0) {}
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virtual ~RenderTask() {}
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virtual void run() = 0;
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RenderTask* mNext;
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nsecs_t mRunAt; // nano-seconds on the SYSTEM_TIME_MONOTONIC clock
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};
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class SignalingRenderTask : public RenderTask {
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public:
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// Takes ownership of task, caller owns lock and signal
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SignalingRenderTask(RenderTask* task, Mutex* lock, Condition* signal)
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: mTask(task), mLock(lock), mSignal(signal), mHasRun(false) {}
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virtual void run() override;
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bool hasRun() const { return mHasRun; }
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private:
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RenderTask* mTask;
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Mutex* mLock;
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Condition* mSignal;
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bool mHasRun;
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};
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typedef void* (*RunnableMethod)(void* data);
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class MethodInvokeRenderTask : public RenderTask {
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public:
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explicit MethodInvokeRenderTask(RunnableMethod method) : mMethod(method), mReturnPtr(nullptr) {}
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void* payload() { return mData; }
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void setReturnPtr(void** retptr) { mReturnPtr = retptr; }
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virtual void run() override {
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void* retval = mMethod(mData);
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if (mReturnPtr) {
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*mReturnPtr = retval;
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}
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// Commit suicide
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delete this;
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}
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private:
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RunnableMethod mMethod;
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char mData[METHOD_INVOKE_PAYLOAD_SIZE];
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void** mReturnPtr;
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};
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} /* namespace renderthread */
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} /* namespace uirenderer */
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} /* namespace android */
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#endif /* RENDERTASK_H_ */
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