Rather than an arbitrary sleep interval, improve robustness and speed
  things up (in the usual case) by using an event mutex.

Submitted by: David Shane Holden <dpejesh@yahoo.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96208 13f79535-47bb-0310-9956-ffa450edef68