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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef RENDERTASK_H_
#define RENDERTASK_H_
#include <cutils/compiler.h>
#include <utils/Timers.h>
namespace android {
class Mutex;
class Condition;
namespace uirenderer {
namespace renderthread {
#define METHOD_INVOKE_PAYLOAD_SIZE (8 * sizeof(void*))
/*
* Notes about memory management
*
* RenderThread will only invoke RenderTask::run(). It is the responsibility
* of the RenderTask to know if it needs to suicide at the end of run() or
* if some other lifecycle is being used. As such, it is not valid to reference
* anything on RenderTask after the first call to run().
*
* For example SignalingRenderTask
* is expected to be stack allocated by the calling thread, so it does not
* suicide in run() but instead relies on the caller to destroy it.
*
* MethodInvokeRenderTask however is currently allocated with new, so it will
* suicide at the end of run(). TODO: Replace this with a small pool to avoid
* malloc/free churn of small objects?
*/
class ANDROID_API RenderTask {
public:
ANDROID_API RenderTask() : mNext(nullptr), mRunAt(0) {}
ANDROID_API virtual ~RenderTask() {}
ANDROID_API virtual void run() = 0;
RenderTask* mNext;
nsecs_t mRunAt; // nano-seconds on the SYSTEM_TIME_MONOTONIC clock
};
class SignalingRenderTask : public RenderTask {
public:
// Takes ownership of task, caller owns lock and signal
SignalingRenderTask(RenderTask* task, Mutex* lock, Condition* signal)
: mTask(task), mLock(lock), mSignal(signal) {}
virtual void run() override;
private:
RenderTask* mTask;
Mutex* mLock;
Condition* mSignal;
};
typedef void* (*RunnableMethod)(void* data);
class MethodInvokeRenderTask : public RenderTask {
public:
MethodInvokeRenderTask(RunnableMethod method)
: mMethod(method), mReturnPtr(nullptr) {}
void* payload() { return mData; }
void setReturnPtr(void** retptr) { mReturnPtr = retptr; }
virtual void run() override {
void* retval = mMethod(mData);
if (mReturnPtr) {
*mReturnPtr = retval;
}
// Commit suicide
delete this;
}
private:
RunnableMethod mMethod;
char mData[METHOD_INVOKE_PAYLOAD_SIZE];
void** mReturnPtr;
};
} /* namespace renderthread */
} /* namespace uirenderer */
} /* namespace android */
#endif /* RENDERTASK_H_ */
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