HELP - C++ Cpu Usage %100 Problem.

#include <windows.h>  
#include <tlhelp32.h>  
#include <shlwapi.h>  
#include <tchar.h>
#include <conio.h>  
#include <stdio.h>
#include <Windows.h> 

#include <stdio.h> 
#include <cstdlib> 
#include <iostream> 
#include <time.h>
#include <tlhelp32.h> 
#include <string> 
#include <string.h> 
#include <iostream>
#include <windows.h>
#include <stdlib.h>
#include <cstdlib>
#include <string>
#include <Shellapi.h>
#include <windows.h>
#include <string.h>
#include <string>
#include <time.h>
#include <iostream>
#include <iostream>
using namespace std;
#include <fstream>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <windows.h>
#include <tlhelp32.h>
#include <sys/stat.h>
#pragma comment (lib, "user32.lib")

int val = 0;
void mythread(){
while(1){
val += 1;
If(val = 10000){
	exit(0);
}
Sleep(1000);
}
}
void mythread2(){
while(1){
int val;
ReadProcessMemory(GetCurrentProcess(),(LPVOID)0x513612,&val,sizeof(val),NULL);
If(val > 500){
	exit(0);
}
Sleep(50);
}
}
  


BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
			CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)mythread2, NULL, NULL, NULL);
			CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)mythread, NULL, NULL, NULL);
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
    }
    return TRUE;
}