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baverman/file_lock.py

Created May 25, 2018 04:58
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Revisions

  1. baverman revised this gist May 25, 2018. No changes.
  2. baverman created this gist May 25, 2018.
    20 changes: 20 additions & 0 deletions file_lock.py
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,20 @@
    @contextmanager
    def lock(file_name, block=False):
    fp = open(file_name, 'w')

    opts = fcntl.LOCK_EX
    if not block:
    opts |= fcntl.LOCK_NB

    try:
    fcntl.lockf(fp, opts)
    except IOError:
    if block:
    raise
    yield False
    else:
    try:
    yield True
    finally:
    fcntl.lockf(fp, fcntl.LOCK_UN)
    fp.close()