[Webkit-unassigned] [Bug 209811] New: [WTF] DataMutex: Add runUnlocked()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209811

            Bug ID: 209811
           Summary: [WTF] DataMutex: Add runUnlocked()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com

This patch introduces a runUnlocked() method in WTF::DataMutex::LockedWrapper
to run a lambda function without the lock. This is intended to be used for
small sections of the code that need to be unlocked, in cases where using
scoping would prove non-ergonomic or where running the unlocked section is only
necessary or desired when a certain condition is met -- something that cannot
be done with C++ scoping.

Safety mechanisms are provided. First, because this is used with a lambda, all
variables to be used in the unlocked section have to be specified in the
capture (global capture is possible but not recommended to simplify analysis).
Second, additional checks have been added to DataMutex to detect unlocked
accesses among other conditions. This will detect among other things naive
access to protected members by means of capturing the LockedWrapper by
reference.

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