学步园

Linux中POSIX线程的接口都是C风格的，在C++中必须做一个wrapper类去套住它们。刚好在一个开源的项目中看到一个简单有效的代码，特贴出来，雅俗共赏。

Thread.h

#ifndef _THREAD_H_
#define _THREAD_H_

#include <pthread.h>

class Thread
{
	pthread_t thread;
	bool runnableFlag;

private:

	void setRunnableFlag(bool flag);

public:

	Thread();
	virtual ~Thread();

	virtual bool start();
	virtual void run() = 0;
	bool isRunnable();
	virtual bool stop();

	bool restart()
	{
		stop();
		start();
		return true;
	}
};

#endif

Thread.cpp

#include <Thread.h>
#include <stdio.h>

static void *PosixThreadProc(void *param)
{
	Thread *thread = (Thread *)param;
	thread->run();
	return 0;
}

Thread::Thread()
{
	setRunnableFlag(false);
}

bool Thread::start()
{
	setRunnableFlag(true);
	pthread_attr_t thread_attr;
	pthread_attr_init(&thread_attr);
	pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
	if (pthread_create(&thread, &thread_attr, PosixThreadProc, this) != 0) {
		setRunnableFlag(false);
		pthread_attr_destroy(&thread_attr);
	}
	pthread_attr_destroy(&thread_attr);

	return true;
}

Thread::~Thread()
{
	stop();
}

bool Thread::stop()
{
	if (isRunnable() == true) {
		setRunnableFlag(false);
		pthread_cancel(thread);
		pthread_detach(thread);
	}
	return true;
}

void Thread::setRunnableFlag(bool flag)
{
	runnableFlag = flag;
}

bool Thread::isRunnable()
{
	return runnableFlag;
}

其中还是不可避免地使用了PosixThreadProc非成员函数，但是还有什么好招呢？