Dead2 commented on issue #1775: Deadlock in shm statistics URL: https://github.com/apache/incubator-pagespeed-mod/issues/1775#issuecomment-394729292 @morlovich No crashes in relation to this unfortunately. @jmarantz That is indeed a concern with mpm-itk. But having it live through several connections is impossible, since it cannot re-acquire root permissions once it has given them up. So it has to be a fresh process for each connection. What would help was if it was possible to tell mpm-itk to wait until pagespeed is done processing data before ending the process. I'm not sure how mpm-itk ends the process, but shouldn't mod_pagespeed ideally get notified and be able to release the lock before going away? An alternative would be to spawn off a process(instead of a thread) for handling background rewrites and cache maintenance etc (possibly with the optimization that only one process per vhost exist, and that process gets launched on demand and optionally quits after X minutes idle.). This problem cannot easily be solved by a central daemon/process, since it requires permissions to access the various users files, and permanently running complex code as root is not wanted.
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