[fpc-pascal] Best way to check SimpleIPC for messages

[Michael Schnell]

On 12.05.2017 16:37, Michael Van Canneyt wrote:
>
> Check manually. What else is left ? There is no message queue, so no 
> loop in which to check at regular basis.
>
For event processing in a not threaded project or in the main thread of 
a threaded project you at best use the Event Queue provided by some 
Infrastructure library (e.g. LCL or mse). IMHO, SimpleIPC might makes 
sense, if you don't want to use one of those. (mse and an enhanced NoGui 
LCL "Widget Type", I have done a working draft for, can provide a 
message queue even with no binding to a GUI Widget Set).

But when using SimpleIPC for signaling to another process (executable, 
e.g.  a Lazarus "Application" ) I suppose, you  need a thread to avoid 
latency and/or huge CPU demand by polling to transfer the event to the 
Main Thread via the Event Queue (e.g. by Application.QueueAsyncCall or 
TTherad.Queue).

-Michael