pthread_spin_lock, "memory" clobber missing ?

[Riesch Nicolas]

The code for locking spinlocks in Linux kernel contains a "memory"
clobber.
( see function "_raw_spin_lock(spinlock_t *lock)" at
http://lxr.linux.no/source/include/asm-i386/spinlock.h#L141 )

The code for function "pthread_spin_lock" in file
"nptl/sysdeps/i386/pthread_spin_lock.c" does not contain the "memory"
clobber.

Without "memory" clobber, I suppose the compiler may not flush registers
to memory before entering the spinlock code.
So, shouldn't it be added ?



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