Re: [ECOS] POSIX threads in ecos

Re: [ECOS] POSIX threads in ecos

[Rajeev]

[-- Attachment #1: Type: text/plain, Size: 1462 bytes --]

hi ,
 this is the program i'm trying to debug, see if you could help?
thanks
rajeev
----- Original Message -----
From: "Jonathan Larmour" <jlarmour@redhat.com>
To: "Rajeev" <rajeev@inablers.net>
Cc: <ecos-discuss@sources.redhat.com>
Sent: Tuesday, August 14, 2001 2:45 iNabler
Subject: Re: [ECOS] POSIX threads in ecos


> Rajeev wrote:
> >
> > hi,
> >   i'm trying out the posix threads in ecos. i've three threads 
running a
> > simple program.
> >   when i dont use the sleep call the threads run happily though not 
to
> > the priorities i've set .
> >   but when i use the sleep call the output i get is
> > thread1:hello world
> > thread2:hello world
> > thread3:hello world
> > thread1:hello world
> > thread2:hello world
> > thread3:hello world
> >    >>>>and then the system does nothing.
> >         i'm using an ARM7 based board and i have configured one of 
its
timers
> > for the scheduler to use and i'm using a basic tick of 0.5 secs
> > what might be the problem??
>
> What's the program? I should warn you that these multi-threading 
problems
> are non-trivial to track down, and therefore aren't the type of thing 
I
> would find for you (not a paying customer y'see). If I don't see 
anything
> glaringly obvious in the program, you'll just have to debug it I'm 
afraid.
>
> Jifl
> --
> Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 
271062
> Maybe this world is another planet's Hell -Aldous Huxley || 
Opinions==mine



[-- Attachment #2: posix.c --]
[-- Type: text/x-c, Size: 1907 bytes --]

#include <cyg/posix/pthread.h>
#include <signal.h>
#include <cyg/posix/types.h>
#include <cyg/hal/debug.h>
#define NUM_THREADS     3

pthread_mutex_t clib;

char thread_stacks[3][PTHREAD_STACK_MIN * 2];

void *PrintHello(void *threadid)
{
	int i;
	for(;;){
//		pthread_mutex_lock(&clib);
		disp("Hello World!");		//i still dont have the printfs on my platform
		disp_tag((int)threadid);	//just my own debug statements
//		pthread_mutex_unlock(&clib);
		i = sleep(1);
		if(i) {
			disp("return value from sleep()");
			disp_tag(i);
		}
	}
}

int main()
{
   pthread_t threads[NUM_THREADS];
   int rc, t;
	pthread_attr_t attr[NUM_THREADS];
	struct sched_param sched[NUM_THREADS];
	sched[0].sched_priority = 10;
	sched[1].sched_priority = 20;
	sched[2].sched_priority = 30;
	pthread_mutex_init(&clib, NULL);

	for(t=0;t < NUM_THREADS;t++){
		rc =  pthread_attr_init(&attr[t]);
		if(rc){
			disp("ERROR: return code from pthread_attr_init");
			disp_tag(rc);
		}	
   }
		
   for(t=0;t < NUM_THREADS;t++){
		rc = pthread_attr_setstackaddr( &attr, (void *)&thread_stacks[t][sizeof(thread_stacks[t])] );
		if(rc){
	   	disp("ERROR; return code from pthread_attr_setstackaddr() ");
			disp_tag(rc);
		}
      rc = pthread_attr_setstacksize( &attr, sizeof(thread_stacks[t]) );
		if(rc){
	   	disp("ERROR; return code from pthread_attr_setstacksize() ");
			disp_tag(rc);
		}
		rc = pthread_attr_setschedpolicy(&attr[t], SCHED_RR);
		if(rc){
	   	disp("ERROR; return code from pthread_attr_schedpolicy() ");
			disp_tag(rc);
		}		
		rc = pthread_attr_setschedparam(&attr[t], &sched[t]);
		if(rc){
	   	disp("ERROR; return code from pthread_attr_schedparam() ");
			disp_tag(rc);
		}
   	rc = pthread_create(&threads[t], &attr[t], PrintHello, (void *)t);
   	if (rc){
	   	disp("ERROR; return code from pthread_create() ");
			disp_tag(rc);
   	}
   }
	rc = pause();
	if(rc != -1){
		disp("ERROR:from pause()");
	}
}

Re: [ECOS] POSIX threads in ecos

[Jonathan Larmour]

Rajeev wrote:
> 
> hi ,
>  this is the program i'm trying to debug, see if you could help?

Looks fine. I quickly ran it on the Linux synthetic target and it works
fine. You'll have to debug it more I'm afraid.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

Re: [ECOS] POSIX threads in ecos

[Boris V. Guzhov]

Hi,
Try to increase the size of the threads stacks.

I think that size =PTHREAD_STACK_MIN * 2 is very small.

--
Boris Guzhov,
St.Petersburg, Russia

----- Original Message -----
From: "Rajeev" <rajeev@inablers.net>
To: <jlarmour@redhat.com>
Cc: <ecos-discuss@sources.redhat.com>
Sent: 14 August, 2001 09:51
Subject: Re: [ECOS] POSIX threads in ecos


> hi ,
>  this is the program i'm trying to debug, see if you could help?
> thanks
> rajeev
> ----- Original Message -----
> From: "Jonathan Larmour" <jlarmour@redhat.com>
> To: "Rajeev" <rajeev@inablers.net>
> Cc: <ecos-discuss@sources.redhat.com>
> Sent: Tuesday, August 14, 2001 2:45 iNabler
> Subject: Re: [ECOS] POSIX threads in ecos
>
>
> > Rajeev wrote:
> > >
> > > hi,
> > >   i'm trying out the posix threads in ecos. i've three threads
> running a
> > > simple program.
> > >   when i dont use the sleep call the threads run happily though not
> to
> > > the priorities i've set .
> > >   but when i use the sleep call the output i get is
> > > thread1:hello world
> > > thread2:hello world
> > > thread3:hello world
> > > thread1:hello world
> > > thread2:hello world
> > > thread3:hello world
> > >    >>>>and then the system does nothing.
> > >         i'm using an ARM7 based board and i have configured one of
> its
> timers
> > > for the scheduler to use and i'm using a basic tick of 0.5 secs
> > > what might be the problem??
> >
> > What's the program? I should warn you that these multi-threading
> problems
> > are non-trivial to track down, and therefore aren't the type of thing
> I
> > would find for you (not a paying customer y'see). If I don't see
> anything
> > glaringly obvious in the program, you'll just have to debug it I'm
> afraid.
> >
> > Jifl
> > --
> > Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223)
> 271062
> > Maybe this world is another planet's Hell -Aldous Huxley ||
> Opinions==mine
>
>
>

Re: [ECOS] POSIX threads in ecos

[Rajeev S]

[-- Attachment #1: Type: text/plain, Size: 1453 bytes --]

hi ,
 this is the program i'm trying to debug, see if you could help?
thanks
rajeev
----- Original Message -----
From: "Jonathan Larmour" <jlarmour@redhat.com>
To: "Rajeev" <rajeev@inablers.net>
Cc: <ecos-discuss@sources.redhat.com>
Sent: Tuesday, August 14, 2001 2:45 iNabler
Subject: Re: [ECOS] POSIX threads in ecos


> Rajeev wrote:
> >
> > hi,
> >   i'm trying out the posix threads in ecos. i've three threads running a
> > simple program.
> >   when i dont use the sleep call the threads run happily though not to
> > the priorities i've set .
> >   but when i use the sleep call the output i get is
> > thread1:hello world
> > thread2:hello world
> > thread3:hello world
> > thread1:hello world
> > thread2:hello world
> > thread3:hello world
> >    >>>>and then the system does nothing.
> >         i'm using an ARM7 based board and i have configured one of its
timers
> > for the scheduler to use and i'm using a basic tick of 0.5 secs
> > what might be the problem??
>
> What's the program? I should warn you that these multi-threading problems
> are non-trivial to track down, and therefore aren't the type of thing I
> would find for you (not a paying customer y'see). If I don't see anything
> glaringly obvious in the program, you'll just have to debug it I'm afraid.
>
> Jifl
> --
> Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
> Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine



[-- Attachment #2: posix.c --]
[-- Type: text/x-c, Size: 1906 bytes --]

#include <cyg/posix/pthread.h>
#include <signal.h>
#include <cyg/posix/types.h>
#include <cyg/hal/debug.h>
#define NUM_THREADS     3

pthread_mutex_t clib;

char thread_stacks[3][PTHREAD_STACK_MIN * 2];

void *PrintHello(void *threadid)
{
	int i;
	for(;;){
//		pthread_mutex_lock(&clib);
		disp("Hello World!");		//i still dont have the printfs on my platform
		disp_tag((int)threadid);	//just my own debug statements
//		pthread_mutex_unlock(&clib);
		i = sleep(1);
		if(i) {
			disp("return value from sleep()");
			disp_tag(i);
		}
	}
}

int main()
{
   pthread_t threads[NUM_THREADS];
   int rc, t;
	pthread_attr_t attr[NUM_THREADS];
	struct sched_param sched[NUM_THREADS];
	sched[0].sched_priority = 10;
	sched[1].sched_priority = 20;
	sched[2].sched_priority = 30;
	pthread_mutex_init(&clib, NULL);

	for(t=0;t < NUM_THREADS;t++){
		rc =  pthread_attr_init(&attr[t]);
		if(rc){
			disp("ERROR: return code from pthread_attr_init");
			disp_tag(rc);
		}	
   }
		
   for(t=0;t < NUM_THREADS;t++){
		rc = pthread_attr_setstackaddr( &attr, (void *)&thread_stacks[t][sizeof(thread_stacks[t])] );
		if(rc){
	   	disp("ERROR; return code from pthread_attr_setstackaddr() ");
			disp_tag(rc);
		}
      rc = pthread_attr_setstacksize( &attr, sizeof(thread_stacks[t]) );
		if(rc){
	   	disp("ERROR; return code from pthread_attr_setstacksize() ");
			disp_tag(rc);
		}
		rc = pthread_attr_setschedpolicy(&attr[t], SCHED_RR);
		if(rc){
	   	disp("ERROR; return code from pthread_attr_schedpolicy() ");
			disp_tag(rc);
		}		
		rc = pthread_attr_setschedparam(&attr[t], &sched[t]);
		if(rc){
	   	disp("ERROR; return code from pthread_attr_schedparam() ");
			disp_tag(rc);
		}
   	rc = pthread_create(&threads[t], &attr[t], PrintHello, (void *)t);
   	if (rc){
	   	disp("ERROR; return code from pthread_create() ");
			disp_tag(rc);
   	}
   }
	rc = pause();
	if(rc != -1){
		disp("ERROR:from pause()");
	}
}

Re: [ECOS] POSIX threads in ecos

[Jonathan Larmour]

Rajeev wrote:
> 
> hi,
>   i'm trying out the posix threads in ecos. i've three threads running a
> simple program.
>   when i dont use the sleep call the threads run happily though not to
> the priorities i've set .
>   but when i use the sleep call the output i get is
> thread1:hello world
> thread2:hello world
> thread3:hello world
> thread1:hello world
> thread2:hello world
> thread3:hello world
>    >>>>and then the system does nothing.
>         i'm using an ARM7 based board and i have configured one of its timers
> for the scheduler to use and i'm using a basic tick of 0.5 secs
> what might be the problem??

What's the program? I should warn you that these multi-threading problems
are non-trivial to track down, and therefore aren't the type of thing I
would find for you (not a paying customer y'see). If I don't see anything
glaringly obvious in the program, you'll just have to debug it I'm afraid.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

[ECOS] POSIX threads in ecos

[Rajeev]

hi,
  i'm trying out the posix threads in ecos. i've three threads running a
simple program.
  when i dont use the sleep call the threads run happily though not to
the priorities i've set .
  but when i use the sleep call the output i get is
thread1:hello world
thread2:hello world
thread3:hello world
thread1:hello world
thread2:hello world
thread3:hello world
   >>>>and then the system does nothing.
	i'm using an ARM7 based board and i have configured one of its timers
for the scheduler to use and i'm using a basic tick of 0.5 secs
what might be the problem??

thanks for all help
rajeev