C / C++ / MFC

17-Jul-05 1:38

is there any way to slow a loop down my program is 1 big loop and it runs my cpu at almost 100% how can i cut it down to between 50 and 75%?
i would ask about making it run in the background but thats way over my head lol would like to know how to code a stop and pause button for it tho.

CodeBeetle17-Jul-05 9:25

CodeBeetle

17-Jul-05 9:25

maybe use the Sleep(1); function. That will make the thread sleep for 1ms so that other threads can execute.

CodeBeetle.Com

locoone17-Jul-05 18:34

17-Jul-05 18:34

Sleep(1); makes the program lock up

khan++17-Jul-05 18:56

17-Jul-05 18:56

Use a Thread for the task, and lower the priority of the thread.
For Stop, signal the thread to stop, like: make the loop test variable = 0; so the loop would stop.
For Pause, use SuspendThread() and ResumeThread().

this is this.

locoone17-Jul-05 20:40

17-Jul-05 20:40

im a noob that is russian to me Frown | :(

khan++17-Jul-05 21:50

17-Jul-05 21:50

#include <windows.h>
#include <conio.h>
#include <stdio.h>

bool g_bWorking;
void Worker()
{
while (g_bWorking)
{
//this is the loop where the program does all the work.
printf("ASD");
}
}

unsigned long __stdcall Thread(void* lpVoid)
{
Worker();
return 0;
}
main()
{
unsigned long id;
HANDLE h;
g_bWorking = TRUE;
h = CreateThread(NULL,0,Thread,0,CREATE_SUSPENDED,&id);
SetThreadPriority(h,THREAD_PRIORITY_LOWEST);
ResumeThread(h);
getch();
SuspendThread(h);
getch();
ResumeThread(h);
getch();
return 0;
}
It will start the thread, then on keypress, pause it, then on keypress resume it. You can see the result by running this console application.
When you need to stop it, make g_bWorking = false.
And by-the-way, are you writing a console app, or a windows app?

this is this.

locoone17-Jul-05 21:53

17-Jul-05 21:53

windows app

khan++17-Jul-05 22:02

17-Jul-05 22:02

Please also specify if you are using MFC or Win32. Is it a dialog-based application?
And Is the worker() function a member of your class?

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locoone17-Jul-05 22:04

17-Jul-05 22:04

it is mfc and dialog and the last im not sure what ya mean

khan++17-Jul-05 22:48

17-Jul-05 22:48

I assume this is your worker function:
void CMyDlg::Worker()
{
while (m_bWorking)
{
//processing here.
}
}

In your header file:
HANDLE m_hThread;
bool m_bWorking;
static DWORD __stdcall Thread(LPVOID lpVoid);

In your .cpp file:
DWORD __stdcall CMyDlg::Thread(LPVOID lpVoid)
{
CMyDlg* parent = (CMyDlg*)lpVoid;
parent->Worker();
return 0;
}

void CMyDlg::OnButtonStart()//your button handler function.
{
m_bWorking = TRUE;
m_hThread = CreateThread(NULL,0,Thread,this,CREATE_SUSPENDED,&id);
SetThreadPriority(m_hThread,THREAD_PRIORITY_LOWEST);
ResumeThread(m_hThread);
}

void CMyDlg::OnButtonSuspend()//pause it
{
SuspendThread(m_hThread);
}

void CMyDlg::OnButtonResume()//resume it
{
ResumeThread(m_hThread);
}

void CMyDlg::OnButtonStop()//stop it
{
m_bWorking = false;
}

I hope that helps.

this is this.

locoone17-Jul-05 23:25

17-Jul-05 23:25

m_hThread = CreateThread(NULL,0,Thread,this,CREATE_SUSPENDED,&id);
C:\Program Files\Microsoft Visual Studio\MyProjects\wordlist\wordlistDlg.cpp(230) : error C2065: 'id' : undeclared identifier
its about time to give up

khan++17-Jul-05 23:35

17-Jul-05 23:35

You must have seen in my first post that:
unsigned long id;
or DWORD id;
Please have a look at this MSDN url also:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/createthread.asp[^]

this is this.

locoone18-Jul-05 0:00

18-Jul-05 0:00

unsigned long id;
or DWORD id;
either of them will give another error if i try them and i cant even come close of making since of the web page
Mad | :mad:

just shoot me

khan++18-Jul-05 0:13

18-Jul-05 0:13

First thing to do is Be Calm. Read some poetry.
Next, declaring a variable does not give errors. Make sure you declare it:
DWORD id;
before CreateThread() function call.
And try Rebuild All from the build menu.
If that does not solve the problem, you can post the error that Visual Studio gives.

this is this.

locoone18-Jul-05 0:15