[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: Please do not yell at people for trying to help you.
On Nov 12, 2010, at 8:02 PM, Johnny Billquist wrote:
> On 2010-11-13 04:49, Matt Thomas wrote:
>> simple locks are not mutexes. mutexes are more complex and
>> test-and-set isn't adequate to do the job.
> I (obviously) totally disagree... :-)
> A mutex is simply just an object that only one entity can own at a time.
> Hence "mutex", or mutually exclusive. A test-and-set is precisely all that is
> needed to implement this.
> And if you implement a mutex with spin locking, then you also need to make
> sure that you do not get deadlocks. Either by detecting such things, or make
> sure they don't happen. But that is outside the subject of the test-and-set
Execpt most of our mutexes are sleep mutexes. Only a small minority
are spin mutexes and those are already implemented using BBSSI/BBCCI.
Main Index |
Thread Index |