C++ Boost 多线程(六)，线程的同步

#include <iostream>
#include <boost/thread.hpp>

using namespace std;

boost::mutex mutex;

void func1(int id)
{
	mutex.lock();
	cout<<"thread #"<<id<<endl;
	for (int i=1; i<6; ++i)
	{
		cout<<i<<" ";
	}
	cout<<endl;
	mutex.unlock();
}

int main()
{

	boost::thread t1(func1, 11);
	boost::thread t2(func1, 22);
	boost::thread t3(func1, 33);
	boost::thread t4(func1, 44);
	boost::thread t5(func1, 55);
	t1.join();
	t2.join();
	t3.join();
	t4.join();
	t5.join();


	system("pause");
	return 0;
}

#include <iostream>
#include <boost/thread.hpp>

using namespace std;

boost::mutex mutex;
int k=0;

void decrement()
{
	//离开作用域后可以自动释放的锁
	boost::unique_lock<boost::mutex> lock(mutex);
	for (int i=0; i<=100; ++i)
	{
		k-=i;
	}
	cout<<"after decrement k="<<k<<endl;
}

void increment()
{
	boost::unique_lock<boost::mutex> lock(mutex);
	for (int i=0; i<=100; ++i)
	{
		k+=i;
	}
	cout<<"after increment k="<<k<<endl;
}

int main()
{

	boost::thread t1(increment);
	boost::thread t2(decrement);
	t1.join();
	t2.join();

	system("pause");
	return 0;
}