Daniel.Stodolsky@cs.cmu.edu (06/11/89)
>From probing the ioctl man pages from our hp 835, I see that
asynchronous io is supported (i.e, the system can generate SIGIO when io
is availible on a file). The end of the man page says, under dependencies
SERIES 300
Asynchronous I/O not supported.
Two questions:
1) is the dependency true?
2) If so, does anyone have a work around that does not involve polling.
This has arisen in the context of a dual threaded program that needs to
carry on some computation but also respond to i/o on a udp port.
Daniel Stodolsky
danner@edrc.cmu.edu (128.2.214.1)
Engineering Design Research Center
Carneige Mellon Universityperry@hpfcdc.HP.COM (Perry Scott) (06/13/89)
Changes were made to the 300 driver to support Asyncronous I/O. It's hard to tell when the changes will hit the streets. I believe the official HP line is "it will be available in a future release". For now, develop on the 800 and port to the 300. The 300 passes the 800 test suite, so portability is likely. Perry Scott
rml@hpfcdc.HP.COM (Bob Lenk) (06/14/89)
> 1) is the dependency true? Yes, at least for current releases. > 2) If so, does anyone have a work around that does not involve polling. You can use multiple processes. A second process can just do select() on the file descriptors of interest and send SIGIO or another signal with kill() when appropriate. Various other approaches are possible; that one looks the most like SIGIO on the series 800 and BSD. Bob Lenk rml@hpfcla.hp.com hplabs!hpfcla!rml
klaas@hpindda.HP.COM (Darin Klaas) (06/15/89)
/ hpindda:comp.sys.hp / Daniel.Stodolsky@cs.cmu.edu / 9:24 am Jun 11, 1989 / > This has arisen in the context of a dual threaded program that needs to > carry on some computation but also respond to i/o on a udp port. The SIGIO signal and FIOASYNC ioctl flag are supported on sockets as of 6.5 (300) / 3.1 (800). -- darin