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| #include <windows.h>
#include <stdio.h>
CRITICAL_SECTION cs_read, cs_write;
int a[]= {1,2,3};
DWORD WINAPI SUM(LPVOID param)
{
int i=0;
int sum;
while(TRUE)
{
EnterCriticalSection(&cs_write);
sum = 0;
for(i=0; i<3; i++)
{
sum=sum+a[i];
}
a[0]=sum;
LeaveCriticalSection(&cs_read);
if (a[0] > 100) return 0;
}
return 0;
}
DWORD WINAPI PRINT(LPVOID param)
{
while (TRUE)
{
EnterCriticalSection(&cs_read);
printf("%d %d %d \n",a[0],a[1],a[2]);
LeaveCriticalSection(&cs_write);
if (a[0] > 100) return 0;
}
return 0;
}
int main(void)
{
HANDLE THR[1];
InitializeCriticalSection(&cs_read);
InitializeCriticalSection(&cs_write);
EnterCriticalSection(&cs_read);
THR[0]=CreateThread(NULL, 0, PRINT, NULL , 0, NULL);
THR[1]=CreateThread(NULL, 0, SUM, NULL, 0, NULL);
WaitForMultipleObjects(2, THR, TRUE, INFINITE);
CloseHandle(THR[0]);
CloseHandle(THR[1]);
DeleteCriticalSection(&cs_read);
DeleteCriticalSection(&cs_write);
getchar();
return 0;
} |
