config/467: possible starved listening sockets -- httpd stops responding

[Dean Gaudet <dg...@apache.org>]

>Number:         467
>Category:       config
>Synopsis:       possible starved listening sockets -- httpd stops responding
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache (Apache HTTP Project)
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Thu Apr 24 04:00:01 1997
>Originator:     dgaudet@apache.org
>Organization:
apache
>Release:        1.2
>Environment:
All that do not USE_xxxxx_SERIALIZED_ACCEPT.
>Description:
It is possible on architectures that do not USE_xxxxx_SERIALIZED_ACCEPT
to freeze out some listening sockets when multiple Listen directives
are used.  The workaround is to add -DUSE_FLOCK_SERIALIZED_ACCEPT to
the EXTRA_CFLAGS line in the Configuration file.

See src/conf.h to determine if your architecture is affected.  This affects
many architectures.
>How-To-Repeat:

>Fix:
The permanent fix will likely involve using non-blocking listening sockets.
But experimentation is needed to determine if it's faster to serialize
accept()s than it is to deal with potentially many EAGAIN/EWOULDBLOCKs
>Audit-Trail:
>Unformatted: