Hi. I'm using 2.6.23.14-rt14 on a i586 and I'm quite happy with the current results [1]. I'm writing because I have a problem with a source code that I thought should work. http://svn.arhuaco.org/svn/src/junk/trunk/threads/cond-signal-test.c In a PC (Debian 2.6.24 686 with no RT patches) it prints 1000. In the realtime system it prints 1 or 0. # ./a.out 1 # ./a.out 0 # ./a.out 1 If I do a sched_yield() right after releasing the mutex associated with the condition, the program prints 1000 as expected. void dosignal (void) { pthread_mutex_lock (&cond_mutex); pthread_cond_signal(&cond); pthread_mutex_unlock (&cond_mutex); sched_yield(); // without this I get 0! with Linux and RT patches } So my questions are: * I am missing something? * If sched_yield() is the way to go, is it SMP safe? I did pthread_mutexattr_setprotocol(&mutex_attr, PTHREAD_PRIO_INHERIT) and the syscall succedded but I still got 0 or 1. I think it doesn't matter in this case. Best regards, Nelson.- [1] http://wiki.freaks-unidos.net/weblogs/arhuaco/preempt_rt-test PS: I've tried this with Debian's GLIBC and with Openembedded. Debian: /lib/libc.so.6 GNU C Library stable release version 2.7, by Roland McGrath et al. 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. Compiled by GNU CC version 4.2.3 20080102 (prerelease) (Debian 4.2.2-5). Compiled on a Linux >>2.6.22.12<< system on 2008-01-12. Available extensions: crypt add-on version 2.1 by Michael Glad and others GNU Libidn by Simon Josefsson Native POSIX Threads Library by Ulrich Drepper et al BIND-8.2.3-T5B For bug reporting instructions, please see: <http://www.gnu.org/software/libc/bugs.html>. OpenEmbedded: GNU C Library stable release version 2.5, by Roland McGrath et al. Copyright (C) 2006 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. Compiled by GNU CC version 4.1.2. Compiled on a Linux >>2.6.22-3-686<< system on 2008-01-09. Available extensions: crypt add-on version 2.1 by Michael Glad and others GNU libio by Per Bothner NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk Native POSIX Threads Library by Ulrich Drepper et al BIND-8.2.3-T5B Thread-local storage support included. For bug reporting instructions, please see: <http://www.gnu.org/software/libc/bugs.html> -- http://arhuaco.org - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
