Messages in this thread | | | Subject | Re: [patch 05/15] Generic Mutex Subsystem, mutex-core.patch | From | Steven Rostedt <> | Date | Sun, 18 Dec 2005 23:15:29 -0500 |
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On Mon, 2005-12-19 at 02:37 +0100, Ingo Molnar wrote: > +/* > + * We can speed up the lock-acquire, if the architecture > + * supports cmpxchg and if there's no debugging state > + * to be set up (!DEBUG_MUTEXESS). > + * > + * trick: we can use cmpxchg on the release side too, if bit > + * 0 of lock->owner is set if there is at least a single pending
I think you mean lock->count and not lock->owner (you're getting your patches mixed up ;)
> + * task in the wait_list. This way the release atomic-fastpath > + * can be a mirror image of the acquire path: > + */ > +#if defined(__HAVE_ARCH_CMPXCHG) && !defined(CONFIG_DEBUG_MUTEXESS) > +# define MUTEX_LOCKLESS_FASTPATH > +#endif > +
-- Steve
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