Messages in this thread | | | Date | Tue, 27 Nov 2007 23:19:32 -0600 | From | Larry Finger <> | Subject | Re: Question regarding mutex locking |
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Robert Hancock wrote: > Larry Finger wrote: >> 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() > > Not if another task could be acquiring that lock at the same time, which > is probably the case, otherwise you wouldn't need the mutex. In other > words, if you're going to do this, you might as well toss the mutex > entirely as it's about the same effect.. >
Thanks for the help. Someday, I hope to understand this stuff.
Larry
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