El Wed, Nov 28, 2007 at 08:46:51AM -0600 Larry Finger ha dit: > Matthias Kaehlcke wrote: > > El Tue, Nov 27, 2007 at 10:37:00PM -0600 Larry Finger ha dit: > > > >> If a particular routine needs to lock a mutex, but it may be entered with > >> that mutex already locked, > >> would the following code be SMP safe? > >> > >> hold_lock = mutex_trylock() > >> > >> ... > >> > >> if (hold_lock) > >> mutex_unlock() > > > > this is wont work, a mutex must not be released from another > > context than the one that acquired it. > > I thought that mutex_trylock() returned 1 if it got the lock and 0 if not. If > that is true, wouldn't > the if statement only unlock if the lock was obtained in this routine?
you're right, sorry i read to fast and interpreted that you want to release the mutex in any case -- Matthias Kaehlcke Linux Application Developer Barcelona You must have a plan. If you don't have a plan, you'll become part of somebody else's plan .''`. using free software / Debian GNU/Linux | http://debian.org : :' : `. `'` gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4 `- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/