Bug#191398: marked as done (pthread_mutex_lock() has different behaviour - dynamic/static link)
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and subject line Bug#191398: pthread_mutex_lock() has different behaviour - dynamic/static link
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Date: Wed, 30 Apr 2003 11:54:29 +0200 (MEST)
From: Christian Thomsen <bird@cs.auc.dk>
To: submit@bugs.debian.org
Subject: pthread_mutex_lock() has different behaviour - dynamic/static link
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Package: libc6-dev
Version: 2.2.5-11.2
Severity: normal
-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux splint 2.4.20 #2 Fri Apr 11 18:38:04 CEST 2003 i686
Locale: LANG=C, LC_CTYPE=C
The program below has different behaviour if it is linked either dynamic
or static with pthread:
gcc -lpthread libc_bug.c -o test
cannot reaquire the lock
whereas
gcc /usr/lib/libpthread.a libc_bug.c -o test
can reaquire forever..
also just
gcc libc_bug.c -o test
can reaquire the lock forever
//program
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int main(int argc, char *argv) {
while(1) {
pthread_mutex_lock(&mutex);
fprintf(stderr,"GOT LOCK\n");
pthread_mutex_lock(&mutex);
fprintf(stderr,"GOT LOCK\n");
pthread_mutex_lock(&mutex);
fprintf(stderr,"GOT LOCK\n");
}
return 0;
}
/Christian Thomsen
/DAT 8
/Aalborg Universitet
/Denmark
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>From gotom@debian.or.jp Fri May 02 05:59:31 2003
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Date: Fri, 02 May 2003 19:59:29 +0900
Message-ID: <808ytpy5pq.wl@oris.opensource.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: Christian Thomsen <bird@cs.auc.dk>, 191398-done@bugs.debian.org
Subject: Re: Bug#191398: pthread_mutex_lock() has different behaviour - dynamic/static link
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At Wed, 30 Apr 2003 11:54:29 +0200 (MEST),
Christian Thomsen wrote:
> The program below has different behaviour if it is linked either dynamic
> or static with pthread:
This is caused by gcc pthread implementation vs glibc pthread
implementation.
> gcc -lpthread libc_bug.c -o test
> cannot reaquire the lock
It uses glibc's libpthread. This is normal, and it's blocked.
> gcc /usr/lib/libpthread.a libc_bug.c -o test
>
> can reaquire forever..
>
> also just
>
> gcc libc_bug.c -o test
> can reaquire the lock forever
This two use gcc's pthread. I don't know it's bug or not. However,
I'm not surprised if gcc's pthread cannot block its process entity.
BTW, using static binaries with glibc, you should do:
gcc -static -o test libc_bug.c -lpthread
or
gcc -static -o test libc_bug.c /usr/lib/libpthread.a
I close this bug.
Regards,
-- gotom
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