[Lazarus] How to PostMessage to object?
nc-gaertnma at netcologne.de
Thu Jun 9 11:15:18 CEST 2011
Michael Schnell <mschnell at lumino.de> hat am 9. Juni 2011 um 10:50 geschrieben:
> On 06/08/2011 05:39 PM, Henry Vermaak wrote:
> >> There is no chance for deadlock with main thread calling this from
> >> inside another thread?
> > You have to protect it with a critical section (if you have more than
> > one thread calling QueueAsyncCall).
> A critical section likely will kill the thread latency, so this should
> be avoided
How many calls per second do you want to execute via the main thread?
QueueAsyncCall is *not* thread safe. If QueueAsyncCall should be made thread
safe, then TApplication must be extended to use a critical section for it (or
some lock-free queue, but since we are talking about the GUI thread, latency is
already so bad, that this makes no difference).
Afaik all PostMessages implementations use a critical section. So you don't need
to do that yourself.
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Lazarus