boost之thread
1.boost里的thread创建之后会立即启动。
代码示例:
#include <iostream>
#include <string>
#include <vector>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
using namespace std;
using namespace boost;
mutex io_mu;
void printing(int& x,const string str)
{
for (int i = 0;i < 5;++i)
{
mutex::scoped_lock lock(io_mu);
cout << str << ++x <<endl;
}
}
int main()
{
int x = 0;
thread(printing,x,"hello");
thread(printing,x,"boost");
this_thread::sleep(posix_time::seconds(2));
return 0;
}
2.主线程等待和线程分离，为了防止主线程在子线程未执行完时就退出，可以使用posix_time::seconds和timed_join以及join
#include <iostream>
#include <string>
#include <vector>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
using namespace std;
using namespace boost;
mutex io_mu;
void printing(int& x,const string str)
{
for (int i = 0;i < 5;++i)
{
mutex::scoped_lock lock(io_mu);
cout << str << ++x <<endl;
}
}
int main()
{
int x = 0;
thread t1(printing,x,"hello");
thread t2(printing,x,"boost");
//this_thread::sleep(posix_time::seconds(2));
t1.timed_join(posix_time::seconds(1));
t2.join();
t1.detach();
return 0;
}
3.操作线程，获取线程id和获得可并行(非并发)执行的线程数量。
#include <iostream>
#include <string>
#include <vector>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
using namespace std;
using namespace boost;
mutex io_mu;
void printing(int& x,const string str)
{
for (int i = 0;i < 5;++i)
{
mutex::scoped_lock lock(io_mu);
cout << str << ++x <<endl;
}
}
int main()
{
int x = 0;
thread t1(printing,x,"hello");
thread t2(printing,x,"boost");
cout << t1.get_id()<<endl;
cout << thread::hardware_concurrency()<<endl;
this_thread::sleep(posix_time::seconds(2));
return 0;
}
4.线程中断
代码示例：
#include <iostream>
#include <string>
#include <vector>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
using namespace std;
using namespace boost;
mutex io_mu;
void to_interrupt(int& x,const string str)
try
{
for (int i = 0;i < 5;++i)
{
this_thread::sleep(posix_time::seconds(1));
mutex::scoped_lock lock(io_mu);
cout << str << ++x <<endl;
}
}
catch(thread_interrupted&)
{
cout << "thread_interrupted" <<endl;
}
int main()
{
int x = 0;
thread t(to_interrupt,x,"hello boost");
this_thread::sleep(posix_time::seconds(4));
t.interrupt();
t.join();
return 0;
}
5.线程组
线程组可以看做是线程池，内部是使用顺序容器list<thread*>存放tread的指针。
#include <iostream>
#include <string>
#include <vector>
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
using namespace std;
using namespace boost;
mutex io_mu;
void printing(int& x,const string str)
{
for (int i = 0;i < 5;++i)
{
mutex::scoped_lock lock(io_mu);
cout << str << ++x <<endl;
}
}
int main()
{
int x = 0;
thread_group tg;
tg.create_thread(bind(printing,x,"C++"));
tg.create_thread(bind(printing,x,"BOOST"));
tg.join_all();
return 0;
}