upstream/mercurial-mirror Files · hgext/inotify/linux/__init__.py

manifest: use a size 3 LRU cache to store parsed manifests...

manifest: use a size 3 LRU cache to store parsed manifests Previously, the manifest cache would store the last manifest parsed. We could run into situations with operations like update where we would try parsing the manifest for a revision r1, then r2, then r1 again. This increases the cache size to 3 to avoid that bit of performance fragility.

Dan Villiom Podlaski Christiansen - - Load All Authors

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      # __init__.py - low-level interfaces to the Linux inotify subsystem

      # Copyright 2006 Bryan O'Sullivan <bos@serpentine.com>

      # This library is free software; you can redistribute it and/or modify

      # it under the terms of version 2.1 of the GNU Lesser General Public

      # License, or any later version.

      '''Low-level interface to the Linux inotify subsystem.

      The inotify subsystem provides an efficient mechanism for file status

      monitoring and change notification.

      This package provides the low-level inotify system call interface and

      associated constants and helper functions.

      For a higher-level interface that remains highly efficient, use the

      inotify.watcher package.'''

      __author__ = "Bryan O'Sullivan <bos@serpentine.com>"

      from _inotify import *

      procfs_path = '/proc/sys/fs/inotify'

      def _read_procfs_value(name):

          def read_value():

              try:

                  fp = open(procfs_path + '/' + name)

                  r = int(fp.read())

                  fp.close()

                  return r

              except OSError:

                  return None

          read_value.__doc__ = '''Return the value of the %s setting from /proc.

          If inotify is not enabled on this system, return None.''' % name

          return read_value

      max_queued_events = _read_procfs_value('max_queued_events')

      max_user_instances = _read_procfs_value('max_user_instances')

      max_user_watches = _read_procfs_value('max_user_watches')

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				# __init__.py - low-level interfaces to the Linux inotify subsystem

				# Copyright 2006 Bryan O'Sullivan <bos@serpentine.com>

				# This library is free software; you can redistribute it and/or modify
				# it under the terms of version 2.1 of the GNU Lesser General Public
				# License, or any later version.

				'''Low-level interface to the Linux inotify subsystem.

				The inotify subsystem provides an efficient mechanism for file status
				monitoring and change notification.

				This package provides the low-level inotify system call interface and
				associated constants and helper functions.

				For a higher-level interface that remains highly efficient, use the
				inotify.watcher package.'''

				__author__ = "Bryan O'Sullivan <bos@serpentine.com>"

				from _inotify import *

				procfs_path = '/proc/sys/fs/inotify'

				def _read_procfs_value(name):
				def read_value():
				try:
				fp = open(procfs_path + '/' + name)
				r = int(fp.read())
				fp.close()
				return r
				except OSError:
				return None

				read_value.__doc__ = '''Return the value of the %s setting from /proc.

				If inotify is not enabled on this system, return None.''' % name

				return read_value

				max_queued_events = _read_procfs_value('max_queued_events')
				max_user_instances = _read_procfs_value('max_user_instances')
				max_user_watches = _read_procfs_value('max_user_watches')