Andreas Schwab wrote:
> Larry Finger <[email protected]> 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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