模拟售票程序。
未加锁程序：
#include <iostream.h>
#include <windows.h>
int index = 0;
int ti = 100;
DWORD WINAPI fun1(
LPVOID lpParameter
);
DWORD WINAPI fun2(
LPVOID lpParameter
);
void main()
{
HANDLE hthread1;
hthread1 = CreateThread(NULL,0,fun1,NULL,0,NULL);
CloseHandle(hthread1);
HANDLE hthread2;
hthread2 = CreateThread(NULL,0,fun2,NULL,0,NULL);
CloseHandle(hthread2);
Sleep(4000);//这样主线程不占用CPU
}
DWORD WINAPI fun1(
LPVOID lpParameter
)
{
while(true)
{
if (ti>0)
{
ti--;
cout<<"thread 11111:"<<ti<<endl;
}
else
break;
}
return 0;
}
DWORD WINAPI fun2(
LPVOID lpParameter
)
{
while(true)
{
if (ti>0)
{
ti--;
cout<<"thread 22222:"<<ti<<endl;
Sleep(5);
}
else
break;
}
return 0;
}
加锁程序：
#include <iostream.h>
#include <windows.h>
int index = 0;
int ti = 100;
HANDLE hmutex;//锁
DWORD WINAPI fun1(
LPVOID lpParameter
);
DWORD WINAPI fun2(
LPVOID lpParameter
);
void main()
{
HANDLE hthread1;
hthread1 = CreateThread(NULL,0,fun1,NULL,0,NULL);
CloseHandle(hthread1);
HANDLE hthread2;
hthread2 = CreateThread(NULL,0,fun2,NULL,0,NULL);
CloseHandle(hthread2);
hmutex = CreateMutex(NULL,TRUE,NULL);
// WaitForSingleObject(hmutex,INFINITE);
ReleaseMutex(hmutex);
Sleep(4000);//这样主线程不占用CPU
}
DWORD WINAPI fun1(
LPVOID lpParameter
)
{
while(true)
{
WaitForSingleObject(hmutex,INFINITE);
if (ti>0)
{
ti--;
cout<<"thread 11111:"<<ti<<endl;
}
else
break;
ReleaseMutex(hmutex);
}
return 0;
}
DWORD WINAPI fun2(
LPVOID lpParameter
)
{
while(true)
{
WaitForSingleObject(hmutex,INFINITE);
if (ti>0)
{
ti--;
cout<<"thread 22222:"<<ti<<endl;
Sleep(5);
}
else
break;
ReleaseMutex(hmutex);
}
return 0;
}
可以根据运行结果比较区别，未加锁程序显然存在BUG，多次售同一张票。
标签：NULL,WINAPI,编程,LPVOID,hmutex,win32,ti,DWORD,多线程 From： https://blog.51cto.com/u_15917617/5953238