(06-16-2013, 05:14 PM)eifezesta Wrote: What about threads ?

(06-16-2013, 01:54 PM)RootTheSystem Wrote: So.. I'm doing a timer function in C. I controlled the timer status via a global variable named timerStatus. But when I call the timer function it never stops even I set the value of timerStatus to 0. I think thats because of it is a recursive function.
C code is like this:

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
timerStatus = 1;
Timer(3000);
timerStatus = 0;

return 0;
}

int Timer(int interval){

if(timerStatus == 1){
Sleep(interval);
//Proccess goes here
printf("%s\n","Test");
Timer(interval);
}

return 0;

}

So my question is; How can I change the value of a variable outside from function while that function is on proccess.

Or any fix to this function is O.K

Thanks

(06-16-2013, 05:07 PM)noize Wrote: Easy.

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
    timerStatus = 1;
    Timer(3000);
    timerStatus = 0;
    return 0;
}

int Timer(int interval){
    if(timerStatus == 1){
        Sleep(interval);
        //Proccess goes here
        printf("%s\n","Test");
        // Timer(interval) <-- why was this here?
    }
    return 0;
}

I commented out the buggy line.

Nice to see a new C coder in town.

(06-16-2013, 06:09 PM)RootTheSystem Wrote:

(06-16-2013, 05:07 PM)noize Wrote: Easy.

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
    timerStatus = 1;
    Timer(3000);
    timerStatus = 0;
    return 0;
}

int Timer(int interval){
    if(timerStatus == 1){
        Sleep(interval);
        //Proccess goes here
        printf("%s\n","Test");
        // Timer(interval) <-- why was this here?
    }
    return 0;
}

I commented out the buggy line.

Nice to see a new C coder in town.

Thanks The function must be recursive so it can do the proccess repeatedly with an interval. Thats because Timer(interval); was there.

(06-16-2013, 05:52 PM)Psycho_Coder Wrote:

(06-16-2013, 05:14 PM)eifezesta Wrote: What about threads ?

C doesn't supports threads directly and it doesn't have any library that comes with it. However there are some available libraries on the web, I know one -> POSIX Threads Library pthread.h. For more info :- http://www.cs.cf.ac.uk/Dave/C/node29.html

---

(06-16-2013, 01:54 PM)RootTheSystem Wrote: So.. I'm doing a timer function in C. I controlled the timer status via a global variable named timerStatus. But when I call the timer function it never stops even I set the value of timerStatus to 0. I think thats because of it is a recursive function.
C code is like this:

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
timerStatus = 1;
Timer(3000);
timerStatus = 0;

return 0;
}

int Timer(int interval){

if(timerStatus == 1){
Sleep(interval);
//Proccess goes here
printf("%s\n","Test");
Timer(interval);
}

return 0;

}

So my question is; How can I change the value of a variable outside from function while that function is on proccess.

Or any fix to this function is O.K

Thanks

Your object was not clear to me that what you actually want to make or do.
C has a time.h library for timing functions have a look :- http://www.cplusplus.com/reference/ctime/

Also remember it is not useful to use Sleep() in C as it is not thread safe. Also its is not apart of standard C library.
It depends on the compiler. In some compilers it is there is dos.h opr in some in process.h or in windows.h it depends also there are some other functions like kill().

If you want to create stop watch or something then learn to use the POSIX library

Thank you,
Sincerely,
Psycho_Coder

(06-16-2013, 06:15 PM)RootTheSystem Wrote: Thanks for you answer I know about multi threaded applications but it seems to be hard to use it in C. Isn't there any easier way to do it? Also why the Sleep() function is not safe? Thanks

(06-16-2013, 06:13 PM)noize Wrote:

(06-16-2013, 06:09 PM)RootTheSystem Wrote:

(06-16-2013, 05:07 PM)noize Wrote: Easy.

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
    timerStatus = 1;
    Timer(3000);
    timerStatus = 0;
    return 0;
}

int Timer(int interval){
    if(timerStatus == 1){
        Sleep(interval);
        //Proccess goes here
        printf("%s\n","Test");
        // Timer(interval) <-- why was this here?
    }
    return 0;
}

I commented out the buggy line.

Nice to see a new C coder in town.

Thanks The function must be recursive so it can do the proccess repeatedly with an interval. Thats because Timer(interval); was there.

But in this case it would be endlessly looped, and you said the problem was it never stopped. So, what do you really want to do?

(06-16-2013, 06:22 PM)RootTheSystem Wrote:

(06-16-2013, 06:13 PM)noize Wrote:

(06-16-2013, 06:09 PM)RootTheSystem Wrote:

(06-16-2013, 05:07 PM)noize Wrote: Easy.

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
    timerStatus = 1;
    Timer(3000);
    timerStatus = 0;
    return 0;
}

int Timer(int interval){
    if(timerStatus == 1){
        Sleep(interval);
        //Proccess goes here
        printf("%s\n","Test");
        // Timer(interval) <-- why was this here?
    }
    return 0;
}

I commented out the buggy line.

Nice to see a new C coder in town.

Thanks The function must be recursive so it can do the proccess repeatedly with an interval. Thats because Timer(interval); was there.

But in this case it would be endlessly looped, and you said the problem was it never stopped. So, what do you really want to do?

I want to interfere that timerStatus variable while the function is on proccess. Because I can't change its value while its in endless loop.

(06-16-2013, 06:35 PM)noize Wrote:

(06-16-2013, 06:22 PM)RootTheSystem Wrote:

(06-16-2013, 06:13 PM)noize Wrote:

(06-16-2013, 06:09 PM)RootTheSystem Wrote:

(06-16-2013, 05:07 PM)noize Wrote: Easy.

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
    timerStatus = 1;
    Timer(3000);
    timerStatus = 0;
    return 0;
}

int Timer(int interval){
    if(timerStatus == 1){
        Sleep(interval);
        //Proccess goes here
        printf("%s\n","Test");
        // Timer(interval) <-- why was this here?
    }
    return 0;
}

I commented out the buggy line.

Nice to see a new C coder in town.

Thanks The function must be recursive so it can do the proccess repeatedly with an interval. Thats because Timer(interval); was there.

But in this case it would be endlessly looped, and you said the problem was it never stopped. So, what do you really want to do?

I want to interfere that timerStatus variable while the function is on proccess. Because I can't change its value while its in endless loop.

Then how about:

Code:

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

int Timer(int);
int timerStatus = 0;

int main(void){
    timerStatus = 1;
    Timer(3000);
    timerStatus = 0;
    return 0;
}

int Timer(int interval){
    while (timerStatus == 1){
        Sleep(interval);
        //Proccess goes here
        printf("%s\n","Test");
        // Timer(interval) <-- why was this here?
    }
    return 0;
}

?