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/*
* Copyright (c) 2013, Ford Motor Company
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of the Ford Motor Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SRC_COMPONENTS_INCLUDE_UTILS_THREADS_THREAD_DELEGATE_H_
#define SRC_COMPONENTS_INCLUDE_UTILS_THREADS_THREAD_DELEGATE_H_
#include <pthread.h>
#include "utils/lock.h"
namespace threads {
enum ThreadState {
kInit = 0,
kStarted = 1,
kStopReq = 2
};
class Thread;
/**
* Thread procedure interface.
* Look for "threads/thread.h" for example
*/
class ThreadDelegate {
public:
ThreadDelegate()
: state_(kInit),
thread_(NULL) {
}
/**
* \brief Thread procedure.
*/
virtual void threadMain() = 0;
/**
* Should be called to free all resources allocated in threadMain
* and exiting threadMain
* This function should be blocking and return only when threadMain() will be
* finished in other case segmantation failes are possible
*/
virtual void exitThreadMain();
virtual ~ThreadDelegate();
Thread* thread() const {
return thread_;
}
void set_thread(Thread *thread);
bool ImproveState(unsigned int to) {
state_lock_.Lock();
if ((state_ + 1 == to) || (to == kInit && state_ == kStopReq)) {
state_ = to;
}
state_lock_.Unlock();
return state_ == to;
}
unsigned int state() const {
return state_;
}
private:
volatile unsigned int state_;
sync_primitives::SpinMutex state_lock_;
Thread* thread_;
};
} // namespace threads
#endif // SRC_COMPONENTS_INCLUDE_UTILS_THREADS_THREAD_DELEGATE_H_
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