cvs commit: src/sys/sys proc.h src/sys/kern kern_thread.c
silby at silby.com
Wed Apr 28 13:44:43 PDT 2004
On Wed, 28 Apr 2004, Daniel Eischen wrote:
> Keep track of threads waiting in kse_release() to avoid a race
> condition where kse_wakeup() doesn't yet see them in (interruptible)
> sleep queues. Also add an upcall check to sleepqueue_catch_signals()
> suggested by jhb.
> This commit should fix recent mysql hangs.
> Reviewed by: jhb, davidxu
> Mysql'd by: Robin P. Blanchard <robin.blanchard at gactr uga edu>
Thanks, I'm glad to hear that it's fixed.
Interestingly enough, in addition to stumbling upon this problem with
mysql, the benchmarking I'm doing for a class project also found a problem
in the mysql client libraries. For some reasons, when selecting blobs,
libmysql will get into a loop where it does 4 byte reads. Yes, it will
read entire 100K objects 4 bytes at a time. I'll post about this to the
relevant mailing lists next week...
Mike "Silby" Silbersack
More information about the cvs-src