Improve forking support #804
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Instead of separate locks for buffering and sender modes configuration, use the same lock.
Now that disable_buffering and pre_fork may both try to stop the flush thread at the same time, attempt to stop an already stopped thread does not indicate a bug in the client code.
Single field assignement is atomic according to Python FAQ, so we don't need to protect reads and writes to self._queue as such. The only place where we need a lock is when stopping the sender, to ensure that the Stop marker is the last thing to be placed in there. https://docs.python.org/3/faq/library.html#what-kinds-of-global-value-mutation-are-thread-safe
os.register_at_fork is not available on all python versions, notably python 2.7. While we check for the availability explicitly, mypy cannot see through that and complains.
vickenty
added
the
changelog/Added
The method is now thread safe, and can be used with forking applications.
Re-format parameter descriptions so they are rendered correctly in the html docs.
gh123man
previously approved these changes
Jan 9, 2024
skarimo
previously approved these changes
Jan 10, 2024
gh123man
approved these changes
Jan 10, 2024
skarimo
approved these changes
Jan 10, 2024
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What does this PR do?
Use
register_at_forkadded in Python 3.7+ to transparently handle process fork when the client is using background threads.Description of the Change
Forking support is introduced in several layers:
os.register_at_fork.This approach is similar to one used in dd-trace-py for handling forks.
Alternate Designs
Possible Drawbacks
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changelog/label attached. If applicable it should have thebackward-incompatiblelabel attached.do-not-merge/label attached.kind/andseverity/labels attached at least.