Prevent concurrent multiple opens of leveldb database.
Summary: The fcntl call cannot detect lock conflicts when invoked multiple times from the same thread. Use a static lockedFile Set to record the paths that are locked. A lockfile request checks to see if htis filename already exists in lockedFiles, if so, then it triggers an error. Otherwise, it inserts the filename in the lockedFiles Set. A unlock file request verifies that the filename is in the lockedFiles set and removes it from lockedFiles set. Test Plan: unit test attached Reviewers: heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D4755
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util/filelock_test.cc
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