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/*
* Copyright 2022 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 OBOETESTER_TEST_ERROR_CALLBACK_H
#define OBOETESTER_TEST_ERROR_CALLBACK_H
#include "oboe/Oboe.h"
#include <thread>
/**
* This code is an experiment to see if we can cause a crash from the ErrorCallback.
*/
class TestErrorCallback {
public:
oboe::Result open();
oboe::Result start();
oboe::Result stop();
oboe::Result close();
int test();
int32_t getCallbackMagic() {
return mCallbackMagic.load();
}
protected:
std::atomic<int32_t> mCallbackMagic{0};
private:
void cleanup() {
mDataCallback.reset();
mErrorCallback.reset();
mStream.reset();
}
class MyDataCallback : public oboe::AudioStreamDataCallback { public:
oboe::DataCallbackResult onAudioReady(
oboe::AudioStream *audioStream,
void *audioData,
int32_t numFrames) override;
};
class MyErrorCallback : public oboe::AudioStreamErrorCallback {
public:
MyErrorCallback(TestErrorCallback *parent): mParent(parent) {}
virtual ~MyErrorCallback() {
// If the delete occurs before onErrorAfterClose() then this bad magic
// value will be seen by the Java test code, causing a failure.
// It is also possible that this code will just cause OboeTester to crash!
mMagic = 0xdeadbeef;
LOGE("%s() called", __func__);
}
void onErrorBeforeClose(oboe::AudioStream *oboeStream, oboe::Result error) override {
LOGE("%s() - error = %s, parent = %p",
__func__, oboe::convertToText(error), &mParent);
// Trigger a crash by "deleting" this callback object while in use!
// Do not try this at home. We are just trying to reproduce the crash
// reported in #1603.
std::thread t([this]() {
this->mParent->cleanup(); // Possibly delete stream and callback objects.
LOGE("onErrorBeforeClose called cleanup!");
});
t.detach();
// There is a race condition between the deleting thread and this thread.
// We do not want to add synchronization because the object is getting deleted
// and cannot be relied on.
// So we sleep here to give the deleting thread a chance to win the race.
usleep(10 * 1000);
}
void onErrorAfterClose(oboe::AudioStream *oboeStream, oboe::Result error) override {
// The callback was probably deleted by now.
LOGE("%s() - error = %s, mMagic = 0x%08X",
__func__, oboe::convertToText(error), mMagic.load());
mParent->mCallbackMagic = mMagic.load();
}
private:
TestErrorCallback *mParent;
// This must match the value in TestErrorCallbackActivity.java
static constexpr int32_t kMagicGood = 0x600DCAFE;
std::atomic<int32_t> mMagic{kMagicGood};
};
std::shared_ptr<oboe::AudioStream> mStream;
std::shared_ptr<MyDataCallback> mDataCallback;
std::shared_ptr<MyErrorCallback> mErrorCallback;
static constexpr int kChannelCount = 2;
};
#endif //OBOETESTER_TEST_ERROR_CALLBACK_H
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