I could use a little advice on reentrancy issues for
modules.
I have written a device driver that is nothing more
than a circular FIFO buffer in memory. The read and
write methods access user space, so I know that those
sections of code need to be reentrant. Since the
module represents one shared buffer, I use a couple of
global variables to keep track of the begin and end of
the buffer. I understand that the filp->private field
provides some protection for reentrancy, but don't
know if that is appropriate in this case. Would a
rwlock be a good solution? The buffer is going to be
used to collect some information from a modified IDE
subsystem, so it will be written to many times in
short periods of time, and thus needs to have
efficient write methods.
I've read all I could find on reentrancy in the
kernel docs and in Alessandro Rubini's excellent book.
Any other pointers to things I could read (or good
examples of reentrant modules) would be appreciated.
Thanks,
Al
__________________________________________________
Do You Yahoo!?
Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free!
http://photos.yahoo.com/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Oct 06 2000 - 13:29:27 EDT