Multithreading problem... can anyone solve?

[jbp2004]

Hi !

I am totally new to multithreading. I know some theories behind but I don't have actual coding experience. Can anyone solve the problem below?

Problem:
Write a program that will increment and display an unsigned integer (UINT) for every 100 milliseconds.
UINT must start from 0 then will be reset to 0 when the highest value that a UINT can have is reached.
The program will terminate when the user presses any key.
CONDITIONS:
1. Create a worker thread that will increment and display the integer.
2. When the user presses any key, the worker thread must be terminated, then the program exits.

Thanks!

[ringerxyz]

maybe it 's your homework?
if not ,i suggest you use the timer instead of the thread

[Alin]

Originally posted by jbp2004
Hi !

I am totally new to multithreading. I know some theories behind but I don't have actual coding experience. Can anyone solve the problem below?

Problem:
Write a program that will increment and display an unsigned integer (UINT) for every 100 milliseconds.
UINT must start from 0 then will be reset to 0 when the highest value that a UINT can have is reached.
The program will terminate when the user presses any key.
CONDITIONS:
1. Create a worker thread that will increment and display the integer.
2. When the user presses any key, the worker thread must be terminated, then the program exits.

Thanks!

search in this FAQ for Threads

[Andreas Masur]

[Moved thread]

[jbp2004]

It could be a homework, yes :-) I am undergoing training on C programming. I have finished the basics including advance topics like pointers, arrays, and file handling. Now, I'm on INTERPROCESS COMMUNICATION (IPC), the problem is, it is my first time to face this aspect of C programming. :-)

Thanks for your replies.

[Andreas Masur]

Okay...so you are using C? Furthermore...interprocess communication deals with different processes not threads...

[rudemutant]

this homework assignment is stupid easy... ok grasshopper... look up two things... how to create, access, and change a pointer, and the subject variable... in this case, an unsigned int. now look up the spawn functions in whatever compiler you are using, see what they do. this is homework, so do it. write back.

[jbp2004]

ok, delete this thread.

[jbp2004]

I made the answer to my own question :-)

//=============================================================
//	Project		: DisplayUINT
//	OS			: Windows
//	File		: DisplayUINT.c
//	Version		: 1.0
//	Description	: A porgram that display value of a UINT variable
//				  starting from zero to maximum value of UINT
//				  When UINT_MAX is reached, value is set back to 0
//	History		: 2004-07-05		Created by jbp2004
//=============================================================
#include <windows.h>	/* create thread function */
#include <stdio.h>		
#include <conio.h>		/* _kbhit() function */		

//=====================================================================
//	Function	: PrintVal
//	Description	: This function is executed by the thread created using
//				  CreateThread function. It receives the current value of
//				  uiVal, display this value and increment by 1.
//	Argument	: void *param - accepts the value of uiVal
//	Return		: void
//	Note		: 
//	History		: 2004-07-05		Created by jbp2004
//=====================================================================
void PrintVal(void *param) {
	UINT *nVal = (UINT *)param;		/* assigns the value pointed to by param to nVal */
	
	/* loop while contion in main function is true */
	while (1) {
		printf("%5d",*nVal);		/* print the current value */
		_sleep(100);				/* 100 ms time interval */
		(*nVal)++;					/* then increment */
	
		/* check if maximum value is reached then reset to 0 */
		if ((*nVal)==4294967295)
			*nVal = 0;
	}
}

void main() {	
	UINT uiVal=0;
	/* created thread to execute statements in PrintVal with pointer to 
	   security attributes set to NULL, stack size set to 0, PrintVal argument 
	   current value of uiVal, creation flag set to 0 (so that the thread is not
	   suspended), and thread id is set to NULL */
	if ((CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)PrintVal,&uiVal,0,NULL))==NULL) {
		printf("\nCreate thread failed.\n");	
		return;
	}
	while (!_kbhit());	/* thread created continue to display and increment number as long
	                       as no key is hit or pressed from the keyboard */
}

[rthat]

Nice work jbp2004 !
Glad you solved your own problem

[Arjay]

>> History : 2004-07-05 Created by jbp2004

If you solved this in July of last year, why are you asking the question now?

Arjay

[JimG]

He's not. Look at the date of the post.

[Arjay]

He's not. Look at the date of the post.

Are you sure? The comments are dated for last year.

//=============================================================
//	Project		: DisplayUINT
//	OS			: Windows
//	File		: DisplayUINT.c
//	Version		: 1.0
//	Description	: A porgram that display value of a UINT variable
//				 starting from zero to maximum value of UINT
//				 When UINT_MAX is reached, value is set back to 0
//	History		: 2004-07-05		Created by jbp2004