[vox-tech] Xlib event loop

[R. Douglas Barbieri]

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On Fri, Dec 19, 2003 at 11:47:00AM +1100, Julie Russell wrote:
> Hi Everyone,
>=20
> I am programming in c++ and xlib using common c++ threads. I want to slee=
p a
> thread (which I have initiated as detached). During that process I want to
> recieve events from the xlib event loop and if triggered, interrupt the
> sleeping thread, or if not interrupted, have the thread wake up on it's o=
wn
> after 20 seconds. The problem is, while that thread is asleep, for some
> reason, my event loop appears to be blocked. How can I sleep a thread so
> that the loop doesn't block and then interrupt it cleanly. Why does the x=
lib
> event loop appear to be blocked during this process.

I can think of how I would do this in Win32 There is a API function
called PeekMessage() which "peeks" at the pending message waiting but
does not block. I would use that, but for sleeping the thread, use
WaitOnMultipleObjects().

So, if there is a similar function for xlib which allows just a "peek,"
I would use it instead so that the thread doesn't block there. Then
use the pthread_cond_timeout() function to sleep. A signal to the
conditional object terminates the thread loop then.

I read somewhere that X likes all X-related calls to happen in just one
thread. It could be that when you read the next event, it blocks because
there is other X activity in the other thread? Just a guess, really.

>=20
> Thanks in advance,
> Julie.
>=20
>=20
>=20
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--=20
R. Douglas Barbieri
doug@dooglio.net
http://www.dooglio.net

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