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3_mutex.cpp
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48 lines (40 loc) · 953 Bytes
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#include "stdafx.h"
static std::mutex g_lock;
/*
你在lock一个 std::mutex 对象之后必须解锁（unlock）。
如果你已经对其加锁，你不能再次lock。
*/
void lock_unlock()
{
//上锁
g_lock.lock();
cout << "in id: " << this_thread::get_id() << endl;
this_thread::sleep_for(chrono::seconds(1));
cout << "out id: " << this_thread::get_id() << endl;
//解锁
g_lock.unlock();
}
void f_lock_guard()
{
//lock_guard在构造时会自动锁定互斥量,而在退出作用域后进行析构时就会自动解锁.
lock_guard<std::mutex> lock(g_lock);
cout << "in id: " << this_thread::get_id() << endl;
this_thread::sleep_for(chrono::seconds(1));
cout << "out id: " << this_thread::get_id() << endl;
}
int mutex_demo()
{
std::thread t1(lock_unlock);
std::thread t2(lock_unlock);
std::thread t3(lock_unlock);
t1.join();
t2.join();
t3.join();
std::thread t4(f_lock_guard);
std::thread t5(f_lock_guard);
std::thread t6(f_lock_guard);
t4.join();
t5.join();
t6.join();
return 0;
}