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Forking a multithreaded process is dangerous but allowed, so long as the child
only executes async-signal-safe functions (e.g. exec). Add a test to ensure
that we don't break this behavior.
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When witness is enabled, lock rank order needs to be preserved during
prefork, not only for each arena, but also across arenas. This change
breaks arena_prefork into further stages to ensure valid rank order
across arenas. Also changed test/unit/fork to use a manual arena to
catch this case.
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This resolves #540.
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Add braces around single-line blocks, and remove line breaks before
function-opening braces.
This resolves #537.
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This resolves #535.
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_exit(2) is async-signal-safe, whereas exit(3) is not.
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Fix witness to clear its list of owned mutexes in the child if
platform-specific malloc_mutex code re-initializes mutexes rather than
unlocking them.
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