I've started using the linux threads package recently, and seem
to be experiencing problems with the kernel's scheduler. The error
message I am getting (in my syslog) is:
Jul 16 02:14:52 ns1 kernel: task already on run-queue
I've tried V2.0.35, and V2.1.109. Both kernels exhibit the same
behaviour.
What I'm doing is starting 16 threads using pthread_create.
These threads doing are continuous calls to gethostbyaddr_r to convert
IP addresses to names. Two more threads are used in a classic
reader/writer setup. I'm also making extensive use of semaphores.
To make the problem difficult, it is not easily reproducible
(but what thread problem ever is ...). My program might run fine for a
couple of hours, and then get the above error several times in a couple
of minutes.
If you have an inkling to what the problem might be, I'd
appreciate your comments. I haven't done any kernel work before, and
aren't really looking forward to trying to figure out how the kernel
scheduler works. If you could e-mail me directly at pid@acnielsen.co.nz
I'd appreciate it.
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