[Qt-interest] cross thread signals slots and event queue

[Alexander Kurz]

Hi All,

I would like to use signals and slots with queued connection between 2
threads.

Thread A listens on a serial channel and receives data let's say every 1
sec.
Thread B does some calculation with the received data.

When the calculation takes now longer than 1 second the queue where the
signals are queued gets bigger and bigger until I run out of memory...

Before Qt I used shared memory, mutexes, waitconditions for synchronisation.
Like you would implement a consumer/producer pattern but with only 1 shared
data memory and no queue. There it was no problem because it always used the
latest data for calculation and no queue got expanded.

I would really like to use signals and slots for this usecase because it
would makes things much easier and less code.

I need a mechanism to limit the size of the event queue of a specific thread
or to queue only signals that are not queued already. I could not find
anything like this in the documentation, so maybe someone here could give me
a hint.

Thanks
Lewi
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