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[Gnash] Question about event handling in swf/flash

From: j.random.programmer
Subject: [Gnash] Question about event handling in swf/flash
Date: Thu, 4 Sep 2008 17:41:52 -0700 (PDT)


I am trying to figure out how event handling dispatchers work in flash/.swf.

Specifically, is there a *separat*e event handler thread that invokes the 
callback event handler methods or is that done by the main thread, in between 
frame by frame execution ?

I've googled this, and looked at the tamarin source and also at the gnash 
source. Unfortunately, I am not a C++ programmer so it's proven a bit hard to 

My understanding so far is that there is:

1) There is only one (1) execution thread. No separate event-dispatch thread 
exists in the player. (unlike, say java, where all events are dispatched in the 

2) Events and callbacks (such as with setTimeout) are "queued" and the main 
thread pops events off the queue and invokes them. This is true both for events 
recieved from the operating system (network data, for example) and for things 
like mouseclicks.

3) The main method also invokes code at each "frame". It invokes queued events 
in between frames (or maybe along with them, don't know ?)

Is this understanding by are large true ? This implies that it is possible to 
hang the player entirely by saying "while (true) { }" in an event handler ? 

Best regards,


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