"Paul J. Reder" wrote:
> By the way, when I start Apache then run ps -efH (with no server load) I get
>something like
> webadmin 21803 1 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/Apache
>(1 top level Apache)
> webadmin 21805 21803 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/Apac
>(Start_Server number of these)
> webadmin 21808 21805 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/Ap
>(1 per Start_server)
> webadmin 21809 21808 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/
>(threads_per_Child number of these
> webadmin 21812 21808 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/
> -
> webadmin 21815 21808 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/
> -
> webadmin 21818 21808 0 10:07 pts/3 00:00:00 httpd -d /home/webadmin/
> -
>
> I understand 21803 and I understand 21809 and its ilk. I also understand either
>21805 or 21808
> but not both. What am I missing in the way that processes and threads are handled in
>APR/threaded mpm?
>
I hacked up apr/test/testthread.c so that the threads sleep for several
seconds before exiting. This program creates 4 threads via
apr_thread_create. When all 4 are sleeping, I see:
[gregames@gandalf httpd-2.0]$ ps ax -HO ppid,wchan | grep testthread
3306 1152 rt_sig S pts/0 00:00:00 ./testthread
3307 3306 do_pol S pts/0 00:00:00 ./testthread
3308 3307 nanosl S pts/0 00:00:00 ./testthread
3309 3307 nanosl S pts/0 00:00:00 ./testthread
3310 3307 nanosl S pts/0 00:00:00 ./testthread
3311 3307 nanosl S pts/0 00:00:00 ./testthread
...so it looks like Linux is creating an extra thread/process for us
(3307), probably when we do first pthread_create.
Greg
