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After the sigsetjmp change, this is patch #2 in an effort to get some sanity restored to signal handling in PHP. This patch does two things. First, it makes it possible to reset the timeout without resetting the signal handlers. This is important for cases where an extension may have deferred signals in its MINIT in order to implement critical sections. It also lays the groundwork for cleaning up our signal handling and perhaps eventually implementing our own signal deferring mechanism so we can have true critical sections. The second thing this does is to make it possible to terminate the current child process (only for Apache1 at the moment) on a timeout. There are a number of extensions that are unhappy about being longjmp'ed out of and when this happens on a timeout they are left in an inconsistent state. By turning on exit_on_timeout you can now force the process to terminate on a timeout which will clean up any hanging locks and/or memory left hanging after the longjmp.
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