#include <stdio.h>
#include <process.h>
#include <Windows.h>
int count;
int iloopnum = 0;
CRITICAL_SECTION hCriticalSection;
DWORD WINAPI SectionChildThreadProcedure(LPVOID arglp)
{
DWORD dThreadId = GetCurrentThreadId();
printf("Thread Id = 0x%08x Before Critical Section Count = %d\n", dThreadId, count);
EnterCriticalSection(&hCriticalSection); // Enter Critical Section
for (int n = 0; n < (int)arglp; n++)
{
count++;
}
LeaveCriticalSection(&hCriticalSection); // Leave Critical Section
printf("Thread Id = 0x%08x After Critical Section Count = %d\n", dThreadId, count);
return 0;
}
DWORD WINAPI NoSectionChildThreadProcedure(LPVOID arglp)
{
DWORD dThreadId = GetCurrentThreadId();
printf("Thread Id = 0x%08x Before Nothing Count = %d\n", dThreadId, count);
for (int n = 0; n < (int)arglp; n++)
{
count++;
}
printf("Thread Id = 0x%08x After Nothing Count = %d\n", dThreadId, count);
return 0;
}
int CreateThreadFunc(int argv)
{
HANDLE hChildThread[3];
DWORD dUnusedThreadId;
int check = argv;
InitializeCriticalSection(&hCriticalSection); // initalized Critical Section
printf("Input Loop Num : ");
scanf_s("%d", &iloopnum);
if (check == 1)
{
hChildThread[0] = (HANDLE)CreateThread(NULL, 0, NoSectionChildThreadProcedure, (LPVOID)iloopnum, 0, &dUnusedThreadId);
hChildThread[1] = (HANDLE)CreateThread(NULL, 0, NoSectionChildThreadProcedure, (LPVOID)iloopnum, 0, &dUnusedThreadId);
hChildThread[2] = (HANDLE)CreateThread(NULL, 0, NoSectionChildThreadProcedure, (LPVOID)iloopnum, 0, &dUnusedThreadId);
}
else if (check == 2)
{
hChildThread[0] = (HANDLE)CreateThread(NULL, 0, SectionChildThreadProcedure, (LPVOID)iloopnum, 0, &dUnusedThreadId);
hChildThread[1] = (HANDLE)CreateThread(NULL, 0, SectionChildThreadProcedure, (LPVOID)iloopnum, 0, &dUnusedThreadId);
hChildThread[2] = (HANDLE)CreateThread(NULL, 0, SectionChildThreadProcedure, (LPVOID)iloopnum, 0, &dUnusedThreadId);
}
if (!hChildThread[0] || !hChildThread[1] || !hChildThread[2])
{
printf("Error CreateChildThread Error");
return NULL;
}
DWORD dwResult = WaitForMultipleObjects(3, hChildThread, TRUE, INFINITE);
if (dwResult != WAIT_OBJECT_0)
{
printf("Error WaitForMultipleObject()");
return 0;
}
CloseHandle(hChildThread[0]);
CloseHandle(hChildThread[1]);
CloseHandle(hChildThread[2]);
DeleteCriticalSection(&hCriticalSection);
return 0;
}
int main(void)
{
int i = 0;
while (1)
{
printf("1. Nothing\n2. Set Mutex\nInput Number : ");
scanf_s("%d", &i);
if (i == 1 || i == 2)
{
CreateThreadFunc(i);
return 0;
}
else
{
printf("Input legal Value\n");
}
}
}
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결과
1. Nothing
2. Set Mutex
Input Number : 1
Input Loop Num : 10000000
Thread Id = 0x000015e0 Before Nothing Count = 0
Thread Id = 0x00003410 Before Nothing Count = 0
Thread Id = 0x00003c4c Before Nothing Count = 0
Thread Id = 0x000015e0 After Nothing Count = 7315211
Thread Id = 0x00003410 After Nothing Count = 10523194
Thread Id = 0x00003c4c After Nothing Count = 10942567
1. Nothing
2. Set Mutex
Input Number : 2
Input Loop Num : 10000000
Thread Id = 0x00003518 Before Critical Section Count = 0
Thread Id = 0x00002f54 Before Critical Section Count = 0
Thread Id = 0x00003a2c Before Critical Section Count = 301601
Thread Id = 0x00003518 After Critical Section Count = 10000000
Thread Id = 0x00002f54 After Critical Section Count = 20000000
Thread Id = 0x00003a2
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