view mercurial/lock.py @ 1759:5afd459db177

Sunpro compiler patch

The compiling runs through without warning, but runnig the newly builded
hg emmits a message:

| ImportError: ld.so.1: python: fatal: relocation error:
| file /opt/local/lib/python2.3/site-packages/mercurial/bdiff.so:
| symbol cmp: referenced symbol not found

Removing the inline infront of cmp corrects this error message.

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

import errno, os, time
import util

class LockException(Exception):
    pass
class LockHeld(LockException):
    pass
class LockUnavailable(LockException):
    pass

class lock(object):
    def __init__(self, file, wait=1, releasefn=None):
        self.f = file
        self.held = 0
        self.wait = wait
        self.releasefn = releasefn
        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 (OSError, IOError), why:
            if why.errno == errno.EEXIST:
                raise LockHeld(util.readlock(self.f))
            else:
                raise LockUnavailable(why)

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