使用原子操作实现互斥锁

define _CRT_SECURE_NO_WARNINGS

include

include

include

include

using namespace std;

typedef int Mutex;

Mutex Lock_read = 0;
Mutex Lock_write = 0;

string sTeststr = "test";

std::atomic_flag alock = ATOMIC_FLAG_INIT;

void Locked(Mutex &mutextype)
{
while (true == alock.test_and_set()) {}
//while (mutextype == 1) {}; //使用while循环并不能实现互斥锁的结构，这就是原子操作的作用
//mutextype = 1;
}

void Unlock(Mutex& mutextype)
{
alock.clear();
//mutextype = 0;
}

void testLock(string sInput)
{
Locked(Lock_write);
sTeststr = sInput;
cout << sTeststr << "=" << sInput<<"mutex:"<< Lock_write << endl;
Unlock(Lock_write);
}

int main()
{
thread thread1(testLock, "1");
thread thread2(testLock, "2");
thread thread3(testLock, "3");
thread thread4(testLock, "4");

thread1.join();
thread2.join();
thread3.join();
thread4.join();



return 0;

}