libthr, libpthread problems

[Archie Cobbs]

Dan Eischen wrote:
> On Thu, 29 Apr 2004, Michael Bretterklieber wrote:
> > currently I'm testing Mpd-4 on -current and It ran into deadlock, 
> > therefore I changed the lib mapping via libmap.conf. When using libc_r 
> > everything is ok, when using libpthread a deadlock occurs under some 
> > circumstances, when using libthr, then:
> > 
> > elvis:/home/mbretter/mpd/src# ./mpd
> > Multi-link PPP for FreeBSD, by Archie L. Cobbs.
> > Based on iij-ppp, by Toshiharu OHNO.
> > The mutex recurse count cannot be less than zero
> 
> Sounds like a bug in the application (recurse count shouldn't
> be less than zero).

Nope.. here's a simpler test case that demonstrates the problem:

    $ cat xx.c 
    #include <stdio.h>
    #include <pthread.h>
    #include <err.h>

    static pthread_mutex_t  mutex;

    int
    main(int argc, char **argv)
    {
	    pthread_mutexattr_t mattr;

	    pthread_mutexattr_init(&mattr);
	    pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_RECURSIVE);
	    pthread_mutex_init(&mutex, &mattr);
	    pthread_mutexattr_destroy(&mattr);
	    pthread_mutex_lock(&mutex);
	    pthread_mutex_unlock(&mutex);
	    return 0;
    }
    $ cc -g -Wall   -o xx xx.o -pthread
    $ ./xx
    The mutex recurse count cannot be less than zero
    Abnormal termination, file: /usr/src/lib/libthr/thread/thr_mutex.c, line: 677
    Abort
    $ uname -r
    5.2-CURRENT
    $ ldd ./xx
    ./xx:
	    libpthread.so.1 => /usr/lib/libthr.so.1 (0x2807b000)
	    libc.so.5 => /lib/libc.so.5 (0x28094000)

Seems to be PTHREAD_MUTEX_RECURSIVE-specific.

-Archie

__________________________________________________________________________
Archie Cobbs      *        CTO, Awarix        *      http://www.awarix.com