mercurial/lock.py
author Thomas Arendsen Hein <thomas@intevation.de>
Fri, 01 Jul 2005 07:31:26 +0100
changeset 545 721bfca3a9dc
parent 515 03f27b1381f9
child 704 5ca319a641e1
child 705 574869103985
permissions -rw-r--r--
Work-around failing tests/test-bad-pull with slow bg process. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Work-around failing tests/test-bad-pull with slow bg process. Without the 'sleep 2' python dumb.py often appeared after hg clone. manifest hash: b32381ac46a7691f2a92595b650b2406853644c2 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFCxOM+W7P1GVgWeRoRAjgTAJ9OqrikdK043Eiyyx9dG8DR1XZ7tgCggdmM AVYvAZO3P+WlaWDu3MaxEXY= =0XN5 -----END PGP SIGNATURE-----

# lock.py - simple locking scheme for mercurial
#
# Copyright 2005 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import os, time
import util

class LockHeld(Exception):
    pass

class lock:
    def __init__(self, file, wait = 1):
        self.f = file
        self.held = 0
        self.wait = wait
        self.lock()

    def __del__(self):
        self.release()

    def lock(self):
        while 1:
            try:
                self.trylock()
                return 1
            except LockHeld, inst:
                if self.wait:
                    time.sleep(1)
                    continue
                raise inst

    def trylock(self):
        pid = os.getpid()
        try:
            util.makelock(str(pid), self.f)
            self.held = 1
        except:
            raise LockHeld(util.readlock(self.f))

    def release(self):
        if self.held:
            self.held = 0
            try:
                os.unlink(self.f)
            except: pass