tree 5787037eb811078b936bb12abfce8a27c2ce85a0
parent 37ecec2b752b69595ca1aa2065180a5e031c94b2
author cdumez@apple.com <cdumez@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1571438742 +0000
committer cdumez@apple.com <cdumez@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1571438742 +0000

[iOS] "Unexpectedly Resumed" process assertion may cause us to get terminated
https://bugs.webkit.org/show_bug.cgi?id=203046
<rdar://problem/56179592>

Reviewed by Geoffrey Garen.

This patch implements the following to avoid getting terminated:
1. Schedule the task to release the assertion on a background thread instead of
   the main thread so that we end up releasing the task even if the main thread
   is somehow hung.
2. Add an invalidation handler to the process assertion which releases the assertion
   upon expiration.

* UIProcess/Cocoa/WebProcessProxyCocoa.mm:
(WebKit::WebProcessProxy::processWasUnexpectedlyUnsuspended):
* WebProcess/WebProcess.cpp:
(WebKit::WebProcess::processDidResume):
* WebProcess/WebProcess.h:
* WebProcess/cocoa/WebProcessCocoa.mm:
(WebKit::WebProcess::processTaskStateDidChange):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@251304 268f45cc-cd09-0410-ab3c-d52691b4dbfc