Hi everybody, I am happy to announce that we now have a JavaScript module for Off Main Thread File I/O (OMTF). This module is called OS.File and, if you need to access files from your code, you really should use it. If you own code that does main thread file I/O, you should really migrate it as soon as possible.
This is true both for platform code and for add-ons. Have fun! *** Off Main Thread File I/O mini-FAQ Q: Why do we need Off Main Thread File I/O? A: Because the duration of *any* I/O operation is unbounded. Even closing a file from the main thread can block your UI for several seconds, unpredictably. Q: Aren't NetUtils.asyncFetch and NetUtils.asyncCopy sufficient? A1: Most uses of NetUtils.asyncCopy I have seen seem to actually perform some main thread file I/O behind the scenes. OS.File is generally more efficient and doesn't. Please use OS.File for file I/O. A2: Also, OS.File provides plenty of other Off Main Thread operations, including renaming, copying files, traversing directories, etc. Q: Any documentation? A: Glad you asked - https://developer.mozilla.org/en-US/docs/JavaScript_OS.File (Work In Progress) Cheers, David -- David Rajchenbach-Teller, PhD Performance Team, Mozilla
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