kevent and wait time?
kevent and wait time?
- Subject: kevent and wait time?
- From: email@hidden
- Date: Sun, 2 Apr 2006 21:42:33 -0700
Hello, all ...
I seem to have found my problem with my kqueue / kevent code, but it
ends up perplexing me even more. The context is this: i'm seeing how
far kqueues can scale in comparison to select() regarding # of
active, simultaneous connections to a server -- C10K stuff,
basically. I've written some C++ code that tests the kqueue by
adding a specified number of descriptors to it, waiting for events
from those descriptors, and seeing how many events from how many
descriptors I can process in some configurable amount of time.
The thing is, my code only seems to work if I specify NULL for the
timeout to kevent() -- kevent() comes back when one of the
descriptors i've added to it indeed has something to tell me.
However, if I specify a timeout of 0 (as a timeval), then kevent()
comes back right away, telling me about some event on some descriptor
i've never heard of (and didn't add to the queue) -- the descriptor
is a really big number, which initially made me think "pointer bug",
but simply changing the timeout to NULL (indefinite), makes
everything work, which makes me thinkg "ok, so it's not a pointer bug."
The relevant piece of code follows -- it's really short :-)
// Test() tesks the kqueue by processing any notifications we get ...
int Test( int iLimit )
{
int iReturn = 0;
for ( int iIndex = 0; iIndex < iLimit; iIndex ++ )
{
struct kevent kLEvent;
struct timespec timeToWait = { 0 };
int iNev = kevent( iKQ, pkEvents,
iNumberOfConnectionsCreated, &kLEvent, 1, NULL /*&timeToWait*/ );
testModule.Process( kLEvent, iNev );
}
testModule.ReportTestResults();
return iReturn;
}
I don't get it. The man page for kevent doesn't say anything about a
non-NULL timeout (well, it's 0, but it's not NULL) affecting how
kevent() works ... what am I doing wrong?
Regards,
John
Falling You - exploring the beauty of voice and sound
http://www.fallingyou.com
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