[Lazarus] Sending messages
mschnell at lumino.de
Fri Nov 25 11:12:10 CET 2011
On 11/25/2011 10:35 AM, Hans-Peter Diettrich wrote:
> So what happens on PostMessage, in detail when multiple threads post
> messages at the same time?
With PostMessage, the events are queued one after the other and (some
days later) handled in the main thread in this sequence,
> TWidgetSet.SendMessage and PostMessage are both documented as
> thread-safe. Is this correct, and if so, how is that ensured?
> Does a SendMessage call bypass any other messages which have been
> queued until that time? (by dispatching the message immediately to the
AFAIK, SendMessage (like Dispatch) (at least when addressing a GUI
object) can only be used in the Main thread, as it (might) result din
just calling the appropriate (not thread safe) LCL function.
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