Hi,
In the liveMedia FAQ section it is written:
"(Note that "triggerEvent()" is the only LIVE555 function that may be called
from an external (i.e., non-LIVE555) thread.)".
We use this possibility and trigger an event from a non-LIVE555 thread.
Sometimes an the event "disappears" ie. it is signalled using triggerEvent()
but the eventHandler is not called. The LIVE555 changelog has the following
entry:
2015.03.16:
- Made a small change to the "BasicTaskScheduler" implementation to reduce the
likelihood of
a race condition with external thread(s) calling "triggerEvent()".
Is it correct that there is a non-zero possibility, that the event will
disappear due to the variables BasicTaskScheduler0::fTriggersAwaitingHandling
and BasicTaskScheduler0::fTriggeredEventClientDatas being accessed concurrently
by the LIVE555 thread and a non-LIVE555 thread?
The behaviour is not immediately obvious from the FAQ and the function
description, but we think it is what we "see" and a workaround to re-trigger
the event at a later time seems to work for now.
Do you also see an issue here?
virtual void triggerEvent(EventTriggerId eventTriggerId, void* clientData =
NULL) = 0;
// Causes the (previously-registered) handler function for the specified
event to be handled (from the event loop).
// The handler function is called with "clientData" as parameter.
// Note: This function (unlike other library functions) may be called
from an external thread
// - to signal an external event. (However, "triggerEvent()" should not
be called with the
// same 'event trigger id' from different threads.)
Best Regards
Jan Rørgaard Hansen
Lead Software Developer
Communication Solutions
Business Area Surveillance
Tel.: + 45 3638 3000
Call me on: Skype<skype:[email protected]?call>
E-mail: [email protected]<mailto:[email protected]>
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