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    SubjectRe: Question regarding mutex locking
    Andreas Schwab wrote:
    > Larry Finger <Larry.Finger@lwfinger.net> writes:
    >
    >> 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()
    >
    > When two CPUs may enter the critical region at the same time, what is
    > the point of the mutex? Also, the first CPU may unlock the mutex while
    > the second one is still inside the critical region.

    Thank you for that answer. I think that I'm finally beginning to understand.

    Larry
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