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  • Committer: Robey Pointer
  • Date: 2007-05-21 07:43:39 UTC
  • Revision ID: robey@lag.net-20070521074339-3wh6r0grwfzkvspj
bug 98826: allow "head:" to be used as a valid revid to represent the current
branch head.

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loggerhead/lockfile.py
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    lock may be acquired multiple times by the same thread, as long as it's
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    released an equal number of times.  unlike threading.Lock, this lock can
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    be used across processes.
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    this uses os.open(O_CREAT|O_EXCL), which apparently works even on windows,
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    but will not work over NFS, if anyone still uses that.  so don't put the
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    cache folder on an NFS server...
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            # remove stale locks left over from a previous run
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            if time.time() - os.stat(filename).st_mtime > MAX_STALE_TIME:
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                os.remove(filename)
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    @with_lock
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    def _try_acquire(self):
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        if self._count > 0:
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            return True
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        except OSError:
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            return False
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    def acquire(self):
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        # try over and over, sleeping on exponential backoff with an upper limit of about 5 seconds
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        pause = 0.1