线程同步（临界区的使用）

Posted 2020-08-09 刘收获

1.SingalObject

 

#include <windows.h>
#include <iostream>

using namespace std;

CRITICAL_SECTION cs;

int m = 0;
int n = 0;
DWORD WINAPI ThreadProc(LPVOID Param);
int main()
{

InitializeCriticalSection(&cs);

int a = 10;
HANDLE ThreadHandle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadProc,NULL, 0, NULL);

EnterCriticalSection(&cs);
for (int i = 0;i<1000;i++)
{
m++;
n++;
printf("Main Thread\r\n");
}
LeaveCriticalSection(&cs);
WaitForSingleObject(ThreadHandle, INFINITE);

 

1.SingalObeject
DeleteCriticalSection(&cs);
printf("%d %d\r\n", m, n);

}

DWORD WINAPI ThreadProc(LPVOID Param)
{
EnterCriticalSection(&cs);
for (int i = 0; i < 1000; i++)
{

printf("Sub Thread\r\n");
m++;
n++;
}
LeaveCriticalSection(&cs);
return 0;
}

 

2.MultipleObject

#include <windows.h>
#include <iostream>

using namespace std;

CRITICAL_SECTION cs;

int m = 0;
int n = 0;
DWORD WINAPI ThreadProc(LPVOID Param);

int main()
{

HANDLE ThreadHandle[5] = { 0 };
InitializeCriticalSection(&cs);

for (int i = 0; i < 5; i++)
{
ThreadHandle[i] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadProc, NULL, 0, NULL);
}

WaitForMultipleObjects(5, ThreadHandle, TRUE, INFINITE);
DeleteCriticalSection(&cs);
printf("%d %d\r\n", m, n);
}

DWORD WINAPI ThreadProc(LPVOID Param)
{
CRITICAL_SECTION cs;

EnterCriticalSection(&::cs);   //注意(&::cs)
for (int i=0;i<10000;i++)
{
m++;
n++;
}
LeaveCriticalSection(&::cs);  //注意(&::cs)

return 0;
}