mercurial/lock.py
author mpm@selenic.com
Tue, 21 Jun 2005 19:31:13 -0800
changeset 419 28511fc21073
parent 161 0b4c5cb953d9
child 422 10c43444a38e
child 429 688d03d6997a
permissions -rw-r--r--
[PATCH] file seperator handling for the other 'OS' -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [PATCH] file seperator handling for the other 'OS' From: K Thananchayan <thananck@yahoo.com> The following patch maintains repo root relative source file names in canonical form (with '/' as file seperator). Mercurial calls os.path.join, os.path.normpath, os.path.walk that use platform's file seperator. This patch does not change seperator in these circumstances (except when the result refer to source files). manifest hash: 2fbb4cb0d3d0bc4f4de5c7c8803fb738072ec6c5 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCuNuBywK+sNU5EO8RAhAZAKCV8cz11+rdof9n1tHb0uDScF34GgCeITNi 4aVikToPXqXyReN9kFP5pnY= =xcV5 -----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

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:
            os.symlink(str(pid), self.f)
            self.held = 1
        except:
            raise LockHeld(os.readlink(self.f))

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