When a socket callback has a timeout, an associated timer event is used to
remove the sockets from the pollset and call a timeout function.
* This includes a noteworthy change to the main event loop. Previously,
we would call epoll, then process the timer events, then iterate through the
poll results. After this patch, the timer events are processed before the poll()
a _non-queued_ action can change the pollset conents (a users timed callback
function conversely could easily sit in a queue while the main thread continues
down into epoll)
* timer events can now have sockets associated with them, those sockets are
removed from the pollset when the timer event fires w/o a queue to the worker.
* timer events now have a canceled flag that can be toggled without locking
the timer list.
* Drop the severity of some wstunnel messages from DEBUG to TRACE1
* Lift the restriction on using asynchronous websockets connections but having
an idle timeout
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1593857 13f79535-47bb-0310-9956-ffa450edef68
- Process lingering close asynchronously instead of tying up worker threads
(based on patch by Jeff Trawick).
- If the number of connections of a process is above
threads_per_child + WORKER_OVERCOMMIT * (idle_workers - 1)
(WORKER_OVERCOMMIT is fixed at 2, at the moment), or if all workers are busy,
don't accept new connections in that process. Such a dynamic connection limit
is necessary because we may have both async and non-async (ssl) connections.
WORKER_OVERCOMMIT should be a config option.
- Don't count idle workers of not-accepting processes against MinSpareThreads,
so that the parent will spawn new processes when necessary.
- If we receive a keep-alive request while all workers are busy, don't block
but close the connection immediately so that the client will re-connect to a
different process.
Related changes:
- Log what is going on at trace loglevels.
- Remove the bypass_push poll type flag, this code cannot be hit anymore
(if it ever could?).
- Add some macro helpers for dealing with timeout queues.
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1137358 13f79535-47bb-0310-9956-ffa450edef68
