boost share_ptr的使用例子

#include <stdio.h>
#include <iostream>
#include <string>
#include <map>
#include <boost/shared_ptr.hpp>

using namespace std;

//  g++ -c boost_share_ptr.cpp -I ../boost_1_66_0/ -L ../boost_1_66_0/stage/lib -lpthread -lboost_system


class TestObj
{
public:
	TestObj(int count)
	:m_nCount(count)
	{
		printf("%s %p \t%d\n", __FUNCTION__, this, m_nCount);
	}

	~TestObj()
	{
		printf("%s %p \t%d\n", __FUNCTION__, this, m_nCount);
	}

	void do_something()
	{
		printf("%s %p \t%d\n", __FUNCTION__, this, m_nCount);
	}
private:
	int m_nCount;
};


typedef std::map<int, boost::shared_ptr<TestObj> > _TestObjMap;
pthread_mutex_t m_mutex;
_TestObjMap TestObjMap;
void *StartThread(void *);
int main(int argc, char* argv[])
{
	printf("学习boost智能指针例子... \n");
	printf("期待结果:\n");
	printf("1.TestObj对象在main线程构造，在StartThread线程使用，使用完之后自动析构；\n");
	printf("2.count == 3的对象因为在main线程还在使用，所以在StartThread线程使用完也不析构\n");

	pthread_t m_thread;
	pthread_attr_t m_attr;

	pthread_attr_init(&m_attr);
	pthread_attr_setdetachstate(&m_attr, PTHREAD_CREATE_DETACHED);
	pthread_create(&m_thread, &m_attr, StartThread, NULL);

	pthread_mutex_init(&m_mutex, NULL);
	int count = 0;
	boost::shared_ptr<TestObj> myTestObj100;
	while(1)
	{
		printf("count = %d\n", count);
		boost::shared_ptr<TestObj> myTestObj(new TestObj(count));

		do{
			pthread_mutex_lock(&m_mutex);
			TestObjMap.insert(std::make_pair<int, boost::shared_ptr<TestObj> >(count,myTestObj));
			pthread_mutex_unlock(&m_mutex);
		}while(0);

		if (count == 3)
		{
			printf("测试这个对象会不会被析构\n");
			myTestObj100 = myTestObj;
		}

		count++;
		sleep(1);
	}
	pthread_mutex_destroy(&m_mutex);
	return 0;
}

void *StartThread(void *)
{
	while(1)
	{
		do{
			pthread_mutex_lock(&m_mutex);
			_TestObjMap::iterator it = TestObjMap.begin();
			if(it != TestObjMap.end())
			{
				TestObjMap.erase(it);
				pthread_mutex_unlock(&m_mutex);

				it->second->do_something();
				break;
			}
			pthread_mutex_unlock(&m_mutex);
		}while(0);

		usleep(500);
	}
	return NULL;
}

[email protected]:~/opensource/sample$ ./boost_share_ptr 
学习boost智能指针例子... 
期待结果:
1.TestObj对象在main线程构造，在StartThread线程使用，使用完之后自动析构；
2.count == 3的对象因为在main线程还在使用，所以在StartThread线程使用完也不析构
count = 0
TestObj 0x14be140 0
do_something 0x14be140 0
~TestObj 0x14be140 0
count = 1
TestObj 0x14be160 1
do_something 0x14be160 1
~TestObj 0x14be160 1
count = 2
TestObj 0x14be140 2
do_something 0x14be140 2
~TestObj 0x14be140 2
count = 3
TestObj 0x14be160 3
测试这个对象会不会被析构
do_something 0x14be160 3
count = 4
TestObj 0x14be1c0 4
do_something 0x14be1c0 4
~TestObj 0x14be1c0 4
count = 5
TestObj 0x14be1e0 5
do_something 0x14be1e0 5
~TestObj 0x14be1e0 5
count = 6
TestObj 0x14be1c0 6
do_something 0x14be1c0 6