Problems with pthread on ARM/PXA270

[Juergen Schindele]

Am Mittwoch, 16. September 2009 schrieb Eric Miao:
> Don't remember we had such problems before. What kind of system
> and libraries are you using?
thanks for your reply.
System is custom PXA270 platform.
with codesourcery compiler (see below)
and glibc 2.5 with pthread.
I dont know what more information to give ?  
> 
> 
> On Wed, Sep 16, 2009 at 3:26 PM, Juergen Schindele <schindele at nentec.de> wrote:
> > Hello all,
> > we tried to implement a thread based software on our PXA270 based platform but
> > we had trouble with pthreads. So i modyfied a tiny progam to test. This little progam creates
> > 10 threads and each thread does print something (an index an a pointer to itself).
> >
> > On my PC with Suse 11.0 Linux (kernel 2.6.27) this works fine as supposed to.
> > Each thread has his turn and print his own values.
> >
> > But on our pxa270 platform the thread switch does not (or really rarely) happen
> > and only one thread is printing always the same values. So i suppose thread
> > switching is not working!
> >
> > Any hints or experiences are welcome !!!
> >
> > we use codesourcery compiler
> > arm-none-linux-gnueabi-gcc (CodeSourcery Sourcery G++ Lite 2007q1-10) 4.2.0 20070413 (prerelease)
> > Copyright (C) 2007 Free Software Foundation, Inc.
> > This is free software; see the source for copying conditions.  There is NO
> > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> >
> > and here the C-code compiled with  "arm-none-linux-gnueabi-gcc -o test test.c -lpthread"
> >
> > #include <errno.h>
> > #include <error.h>
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <pthread.h>
> > #include <time.h>
> >
> > #define NUM_THREADS 10
> > #define NUM_ITERS   50
> > #define TIMEOUT_NS  100000000L
> >
> > static void *thread (void *);
> > static int argument[NUM_THREADS];
> > static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
> > static pthread_attr_t defaultattr;
> >
> > static void * print_thread (void *arg)
> > {
> >    int i;
> >    int number = *((int*)arg);
> >
> >    for (;;) {
> >        pthread_t self = pthread_self ();
> >        printf ("Thread %d is [%d]\n", number, self);
> >    }
> > }
> >
> > int main (void)
> > {
> >    pthread_t th;
> >    int i, retvalue;
> >
> >    struct sched_param param;
> >    pthread_attr_init(&defaultattr);
> >
> >    pthread_attr_setschedpolicy(&defaultattr, SCHED_RR);
> >
> >    param.sched_priority = 10;
> >    if ((retvalue = pthread_attr_setschedparam(&defaultattr, &param))!=0) {
> >        printf ("ERROR\n");
> >        exit (0);
> >    }
> >
> >    for (i = 0; i < NUM_THREADS; i++)
> >    {
> >        argument[i] = i;
> >        if (pthread_create (&th, &defaultattr, print_thread, &argument[i]) != 0)
> >            error (EXIT_FAILURE, 0, "cannot create thread");
> >        printf ("Thread [%d]\n", i);
> >    }
> >
> >    while (1) {
> >        ;
> >    }
> >
> >    /* notreached */
> >    return 0;
> > }
> >
> > --------------------------------------------------------------
> > Jürgen Schindele
> > Software-Entwicklung
> >
> > NENTEC Netzwerktechnologie GmbH
> > Greschbachstr. 12
> > 76229 Karlsruhe
> > Deutschland
> > Telefon: +49 721 94249-51
> > Telefax: +49 721 94249-10
> > E-Mail:  schindele at nentec.de
> > WEB:     www.nentec.de
> >
> > Geschäftsführung: Klaus Becker, Roland Knapp
> > Sitz der Gesellschaft: Karlsruhe
> > Handelsregister: Amtsgericht Mannheim HRB 107658
> > --------------------------------------------------------------
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
> 
> 



-- 
--------------------------------------------------------------
Jürgen Schindele  
Software-Entwicklung

NENTEC Netzwerktechnologie GmbH
Greschbachstr. 12
76229 Karlsruhe
Deutschland
Telefon: +49 721 94249-51
Telefax: +49 721 94249-10
E-Mail:  schindele at nentec.de
WEB:     www.nentec.de
 
Geschäftsführung: Klaus Becker, Roland Knapp
Sitz der Gesellschaft: Karlsruhe
Handelsregister: Amtsgericht Mannheim HRB 107658
 
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