管理人の独り言（プログラミング関連）

1168：７７４さん：2008/12/26(金) 21:07:49 ID:CENbthlg0: #include <windows.h>
#include <iostream>
#include <string>

const unsigned int count = 10000000;

int main(int argc, char **argv){
DWORD s = GetTickCount();

for(unsigned int i = 0; i < count; ++i){
char *p = new char;
delete p;
}

DWORD e = GetTickCount();

std::cout << e - s << std::endl;

unsigned int diff = e - s;

s = GetTickCount();

HANDLE hMutex = CreateMutex(NULL, FALSE, NULL);

for(unsigned int i = 0; i < count; ++i){
WaitForSingleObject(hMutex, INFINITE);

ReleaseMutex(hMutex);
}

e = GetTickCount();

std::cout << e - s << std::endl;

unsigned int diff2 = e - s;

CloseHandle(hMutex);

CRITICAL_SECTION cs;

s = GetTickCount();

InitializeCriticalSection(&cs);

for(unsigned int i = 0; i < count; ++i){
EnterCriticalSection(&cs);

LeaveCriticalSection(&cs);
}

DeleteCriticalSection(&cs);

e = GetTickCount();

std::cout << e - s << std::endl;

unsigned int diff3 = e - s;

std::cout << (double)diff2 / (double)diff << std::endl;
std::cout << (double)diff3 / (double)diff << std::endl;

std::getline(std::cin, std::string());
}

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