Re: [LAD] Best practice for sharing complex data structures with a jack callback function

Am Samstag, 7. Juli 2007 schrieb Lars Luthman:
> On Sat, 2007-07-07 at 02:34 +0200, Fons Adriaensen wrote:
> > * The callback has to know when it can (re)write the object.
> > Clearly it should never wait on a sema, and it is already
> > periodic, so here you can use a flag in the object.
> Is there any advantage in using a simple flag instead of a semaphore and
> sem_trywait()?

A semaphore might mislead you to use wait()/lock() in the wrong thread...

And if you only sync two threads and each of them has its own flag (for
write), there shouldn't be any race-conditions and its easier to use a
bool-variable than semaphore->bla().

Arnold

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