John-Mark Gurney wrote on 01.12.2005 10:55 MSK: JMG> Dmitry Agaphonov wrote this message on Thu, Dec 01, 2005 at 15:06 +0300: JMG> > I have two applications (server A and server B, A asks B for data to JMG> > serve clients) communicating via UNIX-domain socket. Testing local JMG> > clients interact to server A via UNIX-domain sockets too. Server A JMG> > uses kqueue(2) to handle clients and server B. JMG> > JMG> > When about 20 clients start requesting server A without delay, kevent(2) JMG> > doesn't notify about requested EVFILT_WRITE after only few small JMG> > requests. JMG> > JMG> > JMG> > Dumping kevent(2) changelist and eventlist gives the following: JMG> > JMG> > Server A asks for write event (with EV_ONESHOT flag set) to server B: JMG> > [13:45:36][DBG] Changing SysEvent: ident: 8, filter: -2, flags: 0x11, fflags: 0, data: 0, udata: 0x0 JMG> > [13:45:36][DBG] Received SysEvent: ident: 8, filter: -2, flags: 0x11, fflags: 0, data: 8192, udata: 0x0 JMG> > JMG> > So, the socket send buffer has 8192 bytes free. Then A sends 426 JMG> > bytes to B. JMG> > JMG> > Then server A asks for write event again: JMG> > [13:45:36][DBG] Changing SysEvent: ident: 8, filter: -2, flags: 0x11, fflags: 0, data: 0, udata: 0x0 JMG> > JMG> > After this, EVFILT_WRITE event is not returned. Noone else writes to JMG> > this socket. How it is possible? JMG> JMG> are you checking the output from the kevent that sets the sysevent? JMG> kevent if you do something "stupid" like set a _ONESHOT in kevent, and JMG> provide space for events to be returned to userland, the _ONESHOT will JMG> be immediately returned and cleared... JMG> JMG> It could also be an error is trying to be set, but can't be if you JMG> don't provide return space... so w/o seeing your code, I'd make sure JMG> when setting you are able to receive some events, and check what events JMG> you get back...
Not in this, but that was my fault. Thank you for answer. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
