[Qt-interest] Multiple up/down with QSemaphore

[Atlant Schmidt]

Sean:

  I'm having trouble mapping your reply to DiogoLR's question.
  He's not trying to acquire multiple resources guarded by a
  single semaphore; instead, he seems to be trying to acquire
  multiple independent resources each guarded by unique
  semaphores (in Linux/Unix terms, a "semaphore set").

  He could build this functionality, of course, by guarding
  a bunch of semaphore-like objects (perhaps even QSemaphores)
  with a Mutex.

                              Atlant


-----Original Message-----
From: qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com [mailto:qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com] On Behalf Of Sean Harmer
Sent: Tuesday, April 05, 2011 12:53
To: qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] Multiple up/down with QSemaphore

On Tuesday 05 April 2011 13:23:06 DiogoLR wrote:
> *P.S.: A VERY important note... I can't do the operations (down's and up's)
> sequentially, I have to do it simultaneously*.
>
> Can someone help me with that? :)

Did you read the docs for QSemaphore::acquire(int n = 1)?

http://doc.qt.nokia.com/latest/qsemaphore.html#acquire

It says:

"Tries to acquire n resources guarded by the semaphore. If n > available(),
this call will block until enough resources are available."

There is a corresponding release() function that accepts an int.

Cheers,

Sean

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