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// Copyright (C) 2014 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 EMUGL_COMMON_THREAD_H
#define EMUGL_COMMON_THREAD_H
#ifdef _WIN32
#include <windows.h>
#else
#include <pthread.h>
#endif
#include <stdint.h>
namespace emugl {
// Wrapper class for platform-specific threads.
// To create your own thread, define a sub-class of emugl::Thread
// and override its main() method.
//
// For example:
//
// class MyThread : public emugl::Thread {
// public:
// MyThread() : Thread() {}
//
// virtual intptr_t main() {
// ... main thread loop implementation
// return 0;
// }
// };
//
// ...
//
// // Create new instance, but does not start it.
// MyThread* thread = new MyThread();
//
// // Start the thread.
// thread->start();
//
// // Wait for thread completion, and gets result into |exitStatus|.
// int exitStatus;
// thread->wait(&exitStatus);
//
class Thread {
public:
// Public constructor.
Thread();
// Virtual destructor.
virtual ~Thread();
// Override this method in your own thread sub-classes. This will
// be called when start() is invoked on the Thread instance.
virtual intptr_t main() = 0;
// Start a thread instance. Return true on success, false otherwise
// (e.g. if the thread was already started or terminated).
bool start();
// Wait for thread termination and retrieve exist status into
// |*exitStatus|. Return true on success, false otherwise.
// NOTE: |exitStatus| can be NULL.
bool wait(intptr_t *exitStatus);
// Check whether a thread has terminated. On success, return true
// and sets |*exitStatus|. On failure, return false.
// NOTE: |exitStatus| can be NULL.
bool tryWait(intptr_t *exitStatus);
private:
#ifdef _WIN32
static DWORD WINAPI thread_main(void* arg);
HANDLE mThread;
DWORD mThreadId;
CRITICAL_SECTION mLock;
#else // !WIN32
static void* thread_main(void* arg);
pthread_t mThread;
pthread_mutex_t mLock;
#endif
intptr_t mExitStatus;
bool mIsRunning;
};
} // namespace emugl
#endif // EMUGL_COMMON_THREAD_H
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