双核双线程（创建了互斥对象） 为什么有时一个线程执行两遍？
从孙鑫c++教程学的 但是执行时一个线程有时会运行两遍 有时输出还很混乱
比如会输出
Thread1 sell ticket:100
Thread1 sell ticket:100
Thread2 sell ticket:99
还有时候输出
Thread1 sell ticket:Thread2 sell ticket 2625
操作系统是win7 是操作系统的问题？还是双核的问题？。。。
#include<iostream.h>
#include<windows.h>
DWORD WINAPI Thread1Proc(
LPVOID lpParameter
);
DWORD WINAPI Thread2Proc(
LPVOID lpParameter
);
int ticket=100;
HANDLE hMutex;
void main()
{
HANDLE hThread1;
hThread1=CreateThread(NULL,0,Thread1Proc,NULL,0,NULL);
HANDLE hThread2;
hThread2=CreateThread(NULL,0,Thread2Proc,NULL,0,NULL);
CloseHandle(hThread1);
CloseHandle(hThread2);
//cout<<"MainThread is running!"<<endl;
hMutex=CreateMutex(NULL,FALSE,NULL);
Sleep(1000);
return;
}
DWORD WINAPI Thread1Proc(
LPVOID lpParameter
)
{
while(ticket)
{
WaitForSingleObject(hMutex,0);
cout<<"Thread1 sell ticket:"<<ticket--<<endl;
ReleaseMutex(hMutex);
}
return 0;
}
DWORD WINAPI Thread2Proc(
LPVOID lpParameter
)
{
while(ticket)
{
WaitForSingleObject(hMutex,0);
cout<<"Thread2 sell ticket:"<<ticket--<<endl;
ReleaseMutex(hMutex);
}
return 0;
}
[解决办法]
应该不是孙鑫的教学视频里的。 是楼主自己写的吧 有很大的问题。
hMutex=CreateMutex(NULL,FALSE,NULL);
放到CreateThread前面
DWORD WINAPI Thread1Proc(给你改了下 ， Proc2 同上。
LPVOID lpParameter
)
{
while(1)
{
WaitForSingleObject(hMutex, INFINITE);
if (ticket == 0)
{
ReleaseMutex(hMutex);
break;
}
cout<<"Thread1 sell ticket:"<<ticket--<<endl;
ReleaseMutex(hMutex);
}
return 0;
}
