lll_lock on PPC

[Steve Munroe]

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