This eliminates the descriptor copying and mutex operations, and
O(n)-time apr_pollset_remove() loop when used with an apr_pollset
implementation that support the no-copy optimization.
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the httpd core) is responsible for write completion.
Note that, with this commit, the Event MPM is still doing write
completion synchronously. I'll add async write completion as a
separate commit.
Note also that this commit breaks the (experimental) Leader/Followers
MPM on the (equally experimental) async-dev branch. The fix is to add
either synchronous or asynchronous write completion to that MPM. Rather
than hack in synchronous write completion, I'll revisit Leader/Followers
once I have async working in Event.
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The big change is that it now does nonblocking writes when possible. The
goal of this redesign is to more cleanly support asynchronous write completion
in MPMs such as Event or Leader. However, the nonblocking writes may also
help in Worker and Prefork by allowing more overlapping of handler and
output filter processing with network writes.
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a function I think, especially with the fact that
the mapping of getpid() to APR_PID_T_FMT isn't
consistant in some areas.
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ask each child process to do the same. We then monitor until all children have
exited.
The change to ap_start_shutdown(void) to ap_start_shutdown(int) may look like
an external API change, but the function is defined static, and used only in
one place.
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replace with the new ap_relieve_child_processes() call. Add a sleep() call now,
as we lost the timeout inherent in ap_wait_or_timeout(). 1 second seems a sane
choice.
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first).
General approach is to send SIGUSR1 to all children (which will de-listen, and
exit when finished), and to gather all children as they exit.
We don't use a sleep(timeout) for the timeout implementation, because this
would lead to a rut of defunct children until the timeout had expired.
set_graceful_shutdown stolen from Ken Coar. See <3E84B1EC.3050007@Golux.Com>
(28 Mar 2003).
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change;
1.) httpd -k graceful sends SIGUSR1 to the parent pid, which in turn
sends SIGUSR1 to all of the active children,
2.) Active children each close their copy of listener fd's.
This means that the listening sockets are freed for re-use. In the ordinary
case, this makes no difference. However if for example admin changes "Listen
80" to "Listen 81" in the config, this rev makes port 80 immediately available
(no waiting for the graceful children to die).
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when it occurs during restart; it isn't at all uncommon then
when SysV semaphores are used for the accept mutex
same logic already in place for two other mutex calls
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generation in the scoreboard so that mod_status can accurately
represent workers in processes which are gracefully terminating.
New child processes with worker MPM can take over slots of
individual threads within gracefully terminating processes.
Sometimes this is a problem (too many of these gracefully
terminating processes), so it is helpful to have mod_status
provide the information required to recognize these processes.
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with ap_ (this symbol must be exported.) If the others were desired to be
public, they should have been ap_xxx decorated.
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up thread identifiers other than their own. Because the limit of threads
is an int, stuffing the int into the void* value is a safe argument
convention.
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