* lll_lock on PPC
@ 2004-06-22 19:36 Thorsten Kukuk
2004-06-22 21:13 ` Steve Munroe
0 siblings, 1 reply; 2+ messages in thread
From: Thorsten Kukuk @ 2004-06-22 19:36 UTC (permalink / raw)
To: Steve Munroe; +Cc: libc-hacker
Hi,
if I look at the lll_lock implementation on ix86 and PPC, it seems
to me, that on ix86, lll_lock will only call lll_mutex_lock, if
the program is linked against libpthread. But on PPC, lll_lock is
always called, which can lead to a deadlock.
Is this correct?
Thorsten
--
Thorsten Kukuk http://www.suse.de/~kukuk/ kukuk@suse.de
SuSE Linux AG Maxfeldstr. 5 D-90409 Nuernberg
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: lll_lock on PPC
2004-06-22 19:36 lll_lock on PPC Thorsten Kukuk
@ 2004-06-22 21:13 ` Steve Munroe
0 siblings, 0 replies; 2+ messages in thread
From: Steve Munroe @ 2004-06-22 21:13 UTC (permalink / raw)
To: Thorsten Kukuk; +Cc: libc-hacker
Thorsten Kukuk <kukuk@suse.de> wrote on 06/22/2004 02:35:04 PM:
>
> Hi,
>
> if I look at the lll_lock implementation on ix86 and PPC, it seems
> to me, that on ix86, lll_lock will only call lll_mutex_lock, if
> the program is linked against libpthread. But on PPC, lll_lock is
> always called, which can lead to a deadlock.
>
> Is this correct?
For POWER lll_mutex_lock is a inline macro using
atomic_compare_and_exchange_val_acq. lll_lock is just an alias for
lll_mutex_lock:
#define lll_lock(lock) lll_mutex_lock (lock)
There is no call. See
libc/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
Steven J. Munroe
Linux on Power Toolchain Architect
IBM Corporation, Linux Technology Center
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