From mboxrd@z Thu Jan 1 00:00:00 1970 From: schindele@nentec.de (Juergen Schindele) Date: Wed, 16 Sep 2009 17:01:16 +0200 Subject: Problems with pthread on ARM/PXA270 In-Reply-To: References: <200909160926.02036.schindele@nentec.de> Message-ID: <200909161701.16898.schindele@nentec.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 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 > > #include > > #include > > #include > > #include > > #include > > > > #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, ¶m))!=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; > > } > > > > -------------------------------------------------------------- > > J?rgen 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 > > > > Gesch?ftsf?hrung: 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 > > > > -- -------------------------------------------------------------- J?rgen 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 Gesch?ftsf?hrung: Klaus Becker, Roland Knapp Sitz der Gesellschaft: Karlsruhe Handelsregister: Amtsgericht Mannheim HRB 107658 Diese E-Mail enth?lt vertrauliche oder rechtlich gesch?tzte Informationen. 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