Add bdiff.blocks / minor performance tweaks
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Add bdiff.blocks / minor performance tweaks
This refactors bdiff.bdiff so that we can get a list of matching
blocks of line numbers for use by annotate/unidiff.
Minor performance tweaks:
- - add a field for equivalence so we can keep h around a bit longer for cmp
- - mix len into the hash to reduce collisions
- - move an operation into the slow path in longest_match
manifest hash: b1aee590b6291b31069ea8a86b6aa8fb259ac244
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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:
raise LockHeld(util.readlock(self.f))
def release(self):
if self.held:
self.held = 0
os.unlink(self.f)