Qt-interest Archive, July 2007
Looking for a thread-aware QMutex
Message 1 in thread
Hello,
I'm looking for a Qt-class which has the following functionality (in short
the same as WaitForSingleObjetc with a Mutex)
I have to threads A and B and an object O.
Access to object O should be exclusive per thread. It should also be
possible that when thread A has already access to object O and I call LOCK
once again, that it should do nothing than return true. When thread A has
access and thread B requests access with tryLock(timeout) it should wait
timeout msec to acquire access.
QMutex is not the thing I'm looking for, because it is not aware of threads.
Does Qt has such a solution or what I can I do to get this functionality?
Best Regards,
Patrick Feistel
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Message 2 in thread
On Friday 20 July 2007 07:40:57 Patrick Feistel wrote:
> Hello,
>
> I'm looking for a Qt-class which has the following functionality (in short
> the same as WaitForSingleObjetc with a Mutex)
>
> I have to threads A and B and an object O.
> Access to object O should be exclusive per thread. It should also be
> possible that when thread A has already access to object O and I call LOCK
> once again, that it should do nothing than return true. When thread A has
> access and thread B requests access with tryLock(timeout) it should wait
> timeout msec to acquire access.
>
> QMutex is not the thing I'm looking for, because it is not aware of
> threads.
Uhm, QMutex is exactly what you're looking for :) From
http://doc.trolltech.com/4.3/qmutex.html#details:
"The QMutex class provides access serialization between threads."
(Also, given your requirement above, be sure to initialize QMutex as a
recursive mutex. See
http://doc.trolltech.com/4.3/qmutex.html#RecursionMode-enum).
> Does Qt has such a solution or what I can I do to get this functionality?
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Message 3 in thread
Hi again,
thank you, that is exactly what I'm looking for, but I've not seen the
recursion mode *hmpf*
Thanks,
Patrick
"Bradley T Hughes" <bhughes@xxxxxxxxxxxxx> schrieb im Newsbeitrag
news:200707200745.12642.bhughes@xxxxxxxxxxxxxxxx
> On Friday 20 July 2007 07:40:57 Patrick Feistel wrote:
>> Hello,
>>
>> I'm looking for a Qt-class which has the following functionality (in
>> short
>> the same as WaitForSingleObjetc with a Mutex)
>>
>> I have to threads A and B and an object O.
>> Access to object O should be exclusive per thread. It should also be
>> possible that when thread A has already access to object O and I call
>> LOCK
>> once again, that it should do nothing than return true. When thread A has
>> access and thread B requests access with tryLock(timeout) it should wait
>> timeout msec to acquire access.
>>
>> QMutex is not the thing I'm looking for, because it is not aware of
>> threads.
>
> Uhm, QMutex is exactly what you're looking for :) From
> http://doc.trolltech.com/4.3/qmutex.html#details:
>
> "The QMutex class provides access serialization between threads."
>
> (Also, given your requirement above, be sure to initialize QMutex as a
> recursive mutex. See
> http://doc.trolltech.com/4.3/qmutex.html#RecursionMode-enum).
>
>> Does Qt has such a solution or what I can I do to get this functionality?
>
> --
> Bradley T. Hughes - bhughes at trolltech.com
> Trolltech ASA - Sandakervn. 116, P.O. Box 4332 Nydalen, 0402 Oslo, Norway
>
> --
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