thread::thread()
thread::thread(const function0<void>& threadfunc)
W? 一U构造函数用于调用GetCurrentThread构造一个当前线E的thread对象Q第二种则通过传入一个函数或者一个functor来创Z? 新的U程。第二种情况下，threadcd其构造函C间接调用CreateThread来创建线E，q将U程句柄保存到成员变量m_thread中，q? 执行传入的函敎ͼ或执行functor?font color="#990000">operator ()Ҏ(gu)来启动工作线E?br />
我们可以用以下三U方式启动一个新U程Q?font color="#999900">
1、传递一个工作函数来构造一个工作线E?font color="#000099">
1 #include <boost/thread/thread.hpp>
2 #include <boost/thread/mutex.hpp>
3 #include <iostream>
4
5 boost::mutex io_mutex;
6
7 void count() // worker function
8 {
9 for (int i = 0; i < 10; ++i)
10 {
11 boost::mutex::scoped_lock lock(io_mutex);
12 std::cout << i << std::endl;
13 }
14 }
15
16 int main(int argc, char* argv[])
17 {
18 boost::thread thrd1(&count);
19 boost::thread thrd2(&count);
20 thrd1.join();
21 thrd2.join();
22
23 return 0;
24 }
25
2 #include <boost/thread/mutex.hpp>
3 #include <iostream>
4
5 boost::mutex io_mutex;
6
7 void count() // worker function
8 {
9 for (int i = 0; i < 10; ++i)
10 {
11 boost::mutex::scoped_lock lock(io_mutex);
12 std::cout << i << std::endl;
13 }
14 }
15
16 int main(int argc, char* argv[])
17 {
18 boost::thread thrd1(&count);
19 boost::thread thrd2(&count);
20 thrd1.join();
21 thrd2.join();
22
23 return 0;
24 }
25
2、传递一个functor对象来构造一个工作线E?font color="#000099">
1 #include <boost/thread/thread.hpp>
2 #include <boost/thread/mutex.hpp>
3 #include <iostream>
4
5 boost::mutex io_mutex;
6
7 struct count
8 {
9 count(int id) : id(id) { }
10
11 void operator()()
12 {
13 for (int i = 0; i < 10; ++i)
14 {
15 boost::mutex::scoped_lock lock(io_mutex); // lock io, will be explained soon.
16 std::cout << id << ": " << i << std::endl;
17 }
18 }
19
20 int id;
21 };
22
23 int main(int argc, char* argv[])
24 {
25 boost::thread thrd1(count(1));
26 boost::thread thrd2(count(2));
27 thrd1.join();
28 thrd2.join();
29 return 0;
30 }
31
2 #include <boost/thread/mutex.hpp>
3 #include <iostream>
4
5 boost::mutex io_mutex;
6
7 struct count
8 {
9 count(int id) : id(id) { }
10
11 void operator()()
12 {
13 for (int i = 0; i < 10; ++i)
14 {
15 boost::mutex::scoped_lock lock(io_mutex); // lock io, will be explained soon.
16 std::cout << id << ": " << i << std::endl;
17 }
18 }
19
20 int id;
21 };
22
23 int main(int argc, char* argv[])
24 {
25 boost::thread thrd1(count(1));
26 boost::thread thrd2(count(2));
27 thrd1.join();
28 thrd2.join();
29 return 0;
30 }
31
3、无需类设计成一个functorQ借助bind来构造functor对象以创建工作线E?br />
1 #include <boost/thread/thread.hpp>
2 #include <boost/thread/mutex.hpp>
3 #include <boost/bind.hpp>
4 #include <iostream>
5
6 boost::mutex io_mutex;
7
8 struct count
9 {
10 static int num;
11 int id;
12
13 count() : id(num++) {}
14
15 int do_count(int n)
16 {
17 for (int i = 0; i < n; ++i)
18 {
19 boost::mutex::scoped_lock lock(io_mutex);
20 std::cout << id << ": " << i << std::endl;
21 }
22 return id;
23 }
24 };
25
26 int count::num = 1;
27
28 int main(int argc, char* argv[])
29 {
30 count c1;
31 boost::thread thrd1(boost::bind(&count::do_count, &c1, 10));
32 thrd1.join();
33 return 0;
34 }
2 #include <boost/thread/mutex.hpp>
3 #include <boost/bind.hpp>
4 #include <iostream>
5
6 boost::mutex io_mutex;
7
8 struct count
9 {
10 static int num;
11 int id;
12
13 count() : id(num++) {}
14
15 int do_count(int n)
16 {
17 for (int i = 0; i < n; ++i)
18 {
19 boost::mutex::scoped_lock lock(io_mutex);
20 std::cout << id << ": " << i << std::endl;
21 }
22 return id;
23 }
24 };
25
26 int count::num = 1;
27
28 int main(int argc, char* argv[])
29 {
30 count c1;
31 boost::thread thrd1(boost::bind(&count::do_count, &c1, 10));
32 thrd1.join();
33 return 0;
34 }
其中bind是一个函数模板，它可以根据后面的实例化参数构造出一个functor来，上面的boost::bind(&count::do_count, &c1, 10)其实{h(hun)于返回了一个functorQ?font color="#990000">
struct countFunctor
{
int operator() ()
{
(&c1)->do_count(10); // just a hint, not actual code
}
};
因此Q以后就?font color="#999900">2中是一L(fng)了?br />
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