Ken,
I believe that the fifo handler gets triggered when a put has been executed on the
other end of the fifo. I don't think that a read on the fifo kicks off the handler.
Rich
-----Original Message-----
From: Ken Ramey [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 14, 2001 3:47 PM
To: [EMAIL PROTECTED]
Subject: [rtl] RT FIFOs and FIFO handlers
I have an RTLinux application that sets up two FIFOs; one for reading
commands from the Linux side and another FIFO for sending data to the
Linux side. Initially, I had the RT data collection thread just shoving
the data up the pipe with rtf_put() as it was ready. I discovered,
however, that I was overrunning the non-rt side.
I have currently configured the system to use FIFO handlers on each
side. The handler for writes from the non-rt side seems to be working
as I expected. The other one, however never seems to be activated. The
non-rt program does a read from the FIFO. I expected that would cause
the FIFO handler to be invoked to put data in the FIFO. Instead, the
handler is never activated and the non-rt application blocks waiting for
data.
I am beginning to suspect that there is a fundamental flaw in my
thinking and that what I am trying to do is not possible. I hope
someone will tell me I am wrong (and that this actually WILL work) and
that I've just made some stupid mistake. Any help would be greatly
appreciated.
Ken Ramey
Steward Observatory
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