Poll directory changes before resolving start promise on Windows #9
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When watching a path on Windows, a new thread gets spawned and a function is scheduled to be executed onto such thread. This function's responsibility is to invoke `ReadDirectoryChangesW` for the first time and to wake up the thread which invoked `Watcher::start`, signaling that nsfw is ready to report events. Previously, the main thread would be woken up _before_ calling `ReadDirectoryChangesW`. If any event occurred before or as `ReadDirectoryChangesW` took place, it wouldn't be reported to clients because that API only reports changes that occur _between_ calls to it. This commit fixes the issue by waiting for `ReadDirectoryChangesW` to have been called before waking up the main thread. This ensures that file system events occurring after watching has started are always reported to clients.
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@as-cii: I think this change looks good, but I'd feel more comfortable if we could verify that nsfw's CI passes following these changes. How would you feel about opening another upstream pull request for this change in https://github.com/Axosoft/nsfw so that we can see CI run and verify that all the CI runs pass? |
jasonrudolph
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Jun 14, 2019
…fix" This reverts commit a0742f8. As of 8734f66, we're now using the nsfw fixes from atom/nsfw#9, which should resolve the flakiness we were seeing on Windows.
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Refs: atom/atom#19507
Refs: atom/atom#19442 (comment)
When watching a path on Windows, a new thread gets spawned and a function is scheduled to be executed onto such thread. This function's responsibility is to invoke
ReadDirectoryChangesWfor the first time and to wake up the thread which invokedWatcher::start, signaling that nsfw is ready to report events.Previously, the main thread would be woken up before calling
ReadDirectoryChangesW. If any event occurred before or asReadDirectoryChangesWtook place, it wouldn't be reported to clients because that API only reports changes that occur between calls to it. This is an excerpt from MSDN:This pull request fixes the issue by waiting for
ReadDirectoryChangesWto have been called before waking up the main thread. This ensures that file system events occurring after watching has started are always reported to clients./cc: @jasonrudolph @rafeca @nathansobo