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# lock.py - simple locking scheme for mercurial

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#

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# Copyright 2005 Matt Mackall <mpm@selenic.com>

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#

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# This software may be used and distributed according to the terms

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# of the GNU General Public License, incorporated herein by reference.

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import os, time

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import util

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class LockHeld(Exception):

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    pass

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class lock:

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    def __init__(self, file, wait=1):

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        self.f = file

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        self.held = 0

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        self.wait = wait

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        self.lock()

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    def __del__(self):

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        self.release()

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    def lock(self):

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        while 1:

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            try:

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                self.trylock()

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                return 1

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            except LockHeld, inst:

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                if self.wait:

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                    time.sleep(1)

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                    continue

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                raise inst

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    def trylock(self):

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        pid = os.getpid()

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        try:

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            util.makelock(str(pid), self.f)

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            self.held = 1

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        except (OSError, IOError):

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            raise LockHeld(util.readlock(self.f))

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    def release(self):

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        if self.held:

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            self.held = 0

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            try:

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                os.unlink(self.f)

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            except: pass

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