upstream/mercurial-mirror Files · mercurial/lock.py

Attempt to yield names in sorted order when walking....

Attempt to yield names in sorted order when walking. This is an improvement in behaviour, but the walk and changes code still has some flaws that make sorted name presentation difficult: - changes returns tuples of names, instead of a sorted list of (name, status) pairs. - walk yields deleted names after all others.

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             lock.py
        
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      # 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 (OSError, IOError):

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

          def release(self):

              if self.held:

                  self.held = 0

                  try:

                      os.unlink(self.f)

                  except: pass

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				# 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 (OSError, IOError):
				raise LockHeld(util.readlock(self.f))

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