Problems with pthread on ARM/PXA270

[Eric Miao]

Don't remember we had such problems before. What kind of system
and libraries are you using?


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
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>
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