annotate mercurial/lock.py @ 42045:d7e751ec679e

compression: display compression level in debugformat Now that we have options to control the compression level, we teach `hg debugformat` about them. This is a useful information when comparing repositories. Note that we have no trace of the compression level used to store existing deltas. Actually, it would even varies from one delta to another. So we display the currently set value.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 02 Apr 2019 11:03:46 -0700
parents ead71b15efd5
children 2372284d9457
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9309
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
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1 # lock.py - simple advisory locking scheme for mercurial
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mpm@selenic.com
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2 #
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345bac2bc4ec update copyrights.
Vadim Gelfer <vadim.gelfer@gmail.com>
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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mpm@selenic.com
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4 #
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Martin Geisler <mg@lazybytes.net>
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5 # This software may be used and distributed according to the terms of the
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Matt Mackall <mpm@selenic.com>
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6 # GNU General Public License version 2 or any later version.
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7
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Gregory Szorc <gregory.szorc@gmail.com>
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8 from __future__ import absolute_import
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Gregory Szorc <gregory.szorc@gmail.com>
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9
26473
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Siddharth Agarwal <sid0@fb.com>
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10 import contextlib
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Gregory Szorc <gregory.szorc@gmail.com>
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11 import errno
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Jun Wu <quark@fb.com>
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12 import os
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13 import signal
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Gregory Szorc <gregory.szorc@gmail.com>
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14 import socket
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 25660
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15 import time
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Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 8108
diff changeset
16 import warnings
161
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17
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diff changeset
18 from .i18n import _
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19
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20 from . import (
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Augie Fackler <augie@google.com>
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21 encoding,
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Gregory Szorc <gregory.szorc@gmail.com>
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22 error,
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Jun Wu <quark@fb.com>
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23 pycompat,
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Yuya Nishihara <yuya@tcha.org>
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24 util,
37120
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25 )
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26
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27 from .utils import (
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28 procutil,
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29 )
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30
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31 def _getlockprefix():
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32 """Return a string which is used to differentiate pid namespaces
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33
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34 It's useful to detect "dead" processes and remove stale locks with
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35 confidence. Typically it's just hostname. On modern linux, we include an
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36 extra Linux-specific pid namespace identifier.
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37 """
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38 result = encoding.strtolocal(socket.gethostname())
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39 if pycompat.sysplatform.startswith('linux'):
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40 try:
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41 result += '/%x' % os.stat('/proc/self/ns/pid').st_ino
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42 except OSError as ex:
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43 if ex.errno not in (errno.ENOENT, errno.EACCES, errno.ENOTDIR):
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44 raise
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45 return result
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46
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47 @contextlib.contextmanager
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48 def _delayedinterrupt():
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49 """Block signal interrupt while doing something critical
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50
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51 This makes sure that the code block wrapped by this context manager won't
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52 be interrupted.
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53
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54 For Windows developers: It appears not possible to guard time.sleep()
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55 from CTRL_C_EVENT, so please don't use time.sleep() to test if this is
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56 working.
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57 """
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58 assertedsigs = []
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59 blocked = False
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60 orighandlers = {}
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61
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62 def raiseinterrupt(num):
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63 if (num == getattr(signal, 'SIGINT', None) or
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64 num == getattr(signal, 'CTRL_C_EVENT', None)):
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65 raise KeyboardInterrupt
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66 else:
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67 raise error.SignalInterrupt
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68 def catchterm(num, frame):
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69 if blocked:
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70 assertedsigs.append(num)
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71 else:
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72 raiseinterrupt(num)
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73
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74 try:
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75 # save handlers first so they can be restored even if a setup is
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76 # interrupted between signal.signal() and orighandlers[] =.
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77 for name in ['CTRL_C_EVENT', 'SIGINT', 'SIGBREAK', 'SIGHUP', 'SIGTERM']:
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78 num = getattr(signal, name, None)
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79 if num and num not in orighandlers:
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80 orighandlers[num] = signal.getsignal(num)
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81 try:
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82 for num in orighandlers:
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83 signal.signal(num, catchterm)
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84 except ValueError:
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85 pass # in a thread? no luck
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86
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Yuya Nishihara <yuya@tcha.org>
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87 blocked = True
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88 yield
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89 finally:
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90 # no simple way to reliably restore all signal handlers because
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91 # any loops, recursive function calls, except blocks, etc. can be
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92 # interrupted. so instead, make catchterm() raise interrupt.
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93 blocked = False
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94 try:
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95 for num, handler in orighandlers.items():
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96 signal.signal(num, handler)
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97 except ValueError:
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98 pass # in a thread?
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99
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100 # re-raise interrupt exception if any, which may be shadowed by a new
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101 # interrupt occurred while re-raising the first one
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102 if assertedsigs:
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103 raiseinterrupt(assertedsigs[0])
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104
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105 def trylock(ui, vfs, lockname, timeout, warntimeout, *args, **kwargs):
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106 """return an acquired lock or raise an a LockHeld exception
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107
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108 This function is responsible to issue warnings and or debug messages about
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109 the held lock while trying to acquires it."""
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110
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111 def printwarning(printer, locker):
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112 """issue the usual "waiting on lock" message through any channel"""
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113 # show more details for new-style locks
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114 if ':' in locker:
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115 host, pid = locker.split(":", 1)
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116 msg = (_("waiting for lock on %s held by process %r on host %r\n")
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117 % (pycompat.bytestr(l.desc), pycompat.bytestr(pid),
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118 pycompat.bytestr(host)))
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119 else:
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120 msg = (_("waiting for lock on %s held by %r\n")
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121 % (l.desc, pycompat.bytestr(locker)))
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122 printer(msg)
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123
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124 l = lock(vfs, lockname, 0, *args, dolock=False, **kwargs)
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125
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126 debugidx = 0 if (warntimeout and timeout) else -1
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127 warningidx = 0
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128 if not timeout:
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129 warningidx = -1
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130 elif warntimeout:
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131 warningidx = warntimeout
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132
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133 delay = 0
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134 while True:
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diff changeset
135 try:
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136 l._trylock()
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137 break
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diff changeset
138 except error.LockHeld as inst:
35209
9153871d50e0 lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents: 35208
diff changeset
139 if delay == debugidx:
9153871d50e0 lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents: 35208
diff changeset
140 printwarning(ui.debug, inst.locker)
35208
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
141 if delay == warningidx:
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
142 printwarning(ui.warn, inst.locker)
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
143 if timeout <= delay:
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
144 raise error.LockHeld(errno.ETIMEDOUT, inst.filename,
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
145 l.desc, inst.locker)
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
146 time.sleep(1)
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
147 delay += 1
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
148
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
149 l.delay = delay
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
150 if l.delay:
35209
9153871d50e0 lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents: 35208
diff changeset
151 if 0 <= warningidx <= l.delay:
36319
c303eda316be lock: delay is numeric, use %d for formatting
Augie Fackler <augie@google.com>
parents: 35897
diff changeset
152 ui.warn(_("got lock after %d seconds\n") % l.delay)
35209
9153871d50e0 lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents: 35208
diff changeset
153 else:
36319
c303eda316be lock: delay is numeric, use %d for formatting
Augie Fackler <augie@google.com>
parents: 35897
diff changeset
154 ui.debug("got lock after %d seconds\n" % l.delay)
35208
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
155 if l.acquirefn:
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
156 l.acquirefn()
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
157 return l
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
158
1559
59b3639df0a9 Convert all classes to new-style classes by deriving them from object.
Eric Hopper <hopper@omnifarious.org>
parents: 1530
diff changeset
159 class lock(object):
9309
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
160 '''An advisory lock held by one process to control access to a set
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
161 of files. Non-cooperating processes or incorrectly written scripts
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
162 can ignore Mercurial's locking scheme and stomp all over the
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
163 repository, so don't do that.
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
164
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
165 Typically used via localrepository.lock() to lock the repository
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
166 store (.hg/store/) or localrepository.wlock() to lock everything
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
167 else under .hg/.'''
cfdcb7a465af localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents: 8312
diff changeset
168
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
169 # lock is symlink on platforms that support it, file on others.
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
170
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
171 # symlink is used because create of directory entry and contents
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
172 # are atomic even over nfs.
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
173
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
174 # old-style lock: symlink to pid
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
175 # new-style lock: symlink to hostname:pid
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
176
4947
3e25a6eb5c9a lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents: 3877
diff changeset
177 _host = None
3e25a6eb5c9a lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents: 3877
diff changeset
178
37659
575f59cdd8a1 lock: don't use 'file' as a variable name
Pulkit Goyal <7895pulkit@gmail.com>
parents: 37658
diff changeset
179 def __init__(self, vfs, fname, timeout=-1, releasefn=None, acquirefn=None,
35208
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
180 desc=None, inheritchecker=None, parentlock=None,
38038
8c828beb7543 lock: add internal config to not replace signal handlers while locking
Yuya Nishihara <yuya@tcha.org>
parents: 37659
diff changeset
181 signalsafe=True, dolock=True):
20091
abfe6a8e619b lock: take both vfs and lock file path relative to vfs to access via vfs
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 19927
diff changeset
182 self.vfs = vfs
37659
575f59cdd8a1 lock: don't use 'file' as a variable name
Pulkit Goyal <7895pulkit@gmail.com>
parents: 37658
diff changeset
183 self.f = fname
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
184 self.held = 0
1787
e431344e604c add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1753
diff changeset
185 self.timeout = timeout
1530
abfab59fce79 add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1062
diff changeset
186 self.releasefn = releasefn
26321
db4c192cb9b3 lock: move acquirefn call to inside the lock
Siddharth Agarwal <sid0@fb.com>
parents: 26291
diff changeset
187 self.acquirefn = acquirefn
2016
ff5c9a92f556 fix backtrace printed when cannot get lock.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1877
diff changeset
188 self.desc = desc
26498
e8564e04382d lock: add a way to prevent locks from being inherited
Siddharth Agarwal <sid0@fb.com>
parents: 26474
diff changeset
189 self._inheritchecker = inheritchecker
26356
927fa07a2ba4 lock: introduce state to keep track of inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26321
diff changeset
190 self.parentlock = parentlock
927fa07a2ba4 lock: introduce state to keep track of inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26321
diff changeset
191 self._parentheld = False
927fa07a2ba4 lock: introduce state to keep track of inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26321
diff changeset
192 self._inherited = False
38038
8c828beb7543 lock: add internal config to not replace signal handlers while locking
Yuya Nishihara <yuya@tcha.org>
parents: 37659
diff changeset
193 if signalsafe:
8c828beb7543 lock: add internal config to not replace signal handlers while locking
Yuya Nishihara <yuya@tcha.org>
parents: 37659
diff changeset
194 self._maybedelayedinterrupt = _delayedinterrupt
8c828beb7543 lock: add internal config to not replace signal handlers while locking
Yuya Nishihara <yuya@tcha.org>
parents: 37659
diff changeset
195 else:
8c828beb7543 lock: add internal config to not replace signal handlers while locking
Yuya Nishihara <yuya@tcha.org>
parents: 37659
diff changeset
196 self._maybedelayedinterrupt = util.nullcontextmanager
15589
cc24e4ed3e0c lock: change name of release chain
Matt Mackall <mpm@selenic.com>
parents: 15583
diff changeset
197 self.postrelease = []
26383
0fceb34806e1 lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents: 26359
diff changeset
198 self.pid = self._getpid()
35208
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
199 if dolock:
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
200 self.delay = self.lock()
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
201 if self.acquirefn:
1b758105b5c7 lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents: 32088
diff changeset
202 self.acquirefn()
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
203
27797
054abf2377e8 lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents: 26498
diff changeset
204 def __enter__(self):
054abf2377e8 lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents: 26498
diff changeset
205 return self
054abf2377e8 lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents: 26498
diff changeset
206
054abf2377e8 lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents: 26498
diff changeset
207 def __exit__(self, exc_type, exc_value, exc_tb):
054abf2377e8 lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents: 26498
diff changeset
208 self.release()
054abf2377e8 lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents: 26498
diff changeset
209
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
210 def __del__(self):
8108
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
211 if self.held:
37897
2efefde3af70 lock: pass sysstr to warnings module
Augie Fackler <augie@google.com>
parents: 37659
diff changeset
212 warnings.warn(r"use lock.release instead of del lock",
8113
87a1605979e4 add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 8108
diff changeset
213 category=DeprecationWarning,
87a1605979e4 add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 8108
diff changeset
214 stacklevel=2)
87a1605979e4 add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 8108
diff changeset
215
8108
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
216 # ensure the lock will be removed
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
217 # even if recursive locking did occur
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
218 self.held = 1
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
219
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
220 self.release()
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
221
26383
0fceb34806e1 lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents: 26359
diff changeset
222 def _getpid(self):
37120
a8a902d7176e procutil: bulk-replace function calls to point to new module
Yuya Nishihara <yuya@tcha.org>
parents: 36701
diff changeset
223 # wrapper around procutil.getpid() to make testing easier
a8a902d7176e procutil: bulk-replace function calls to point to new module
Yuya Nishihara <yuya@tcha.org>
parents: 36701
diff changeset
224 return procutil.getpid()
26383
0fceb34806e1 lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents: 26359
diff changeset
225
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
226 def lock(self):
1787
e431344e604c add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1753
diff changeset
227 timeout = self.timeout
14494
1ffeeb91c55d check-code: flag 0/1 used as constant Boolean expression
Martin Geisler <mg@lazybytes.net>
parents: 13281
diff changeset
228 while True:
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
229 try:
26082
b188f60bd955 lock: make trylock private
Matt Mackall <mpm@selenic.com>
parents: 26081
diff changeset
230 self._trylock()
20380
c697b70f295f localrepo: give a sigh of relief when getting lock after waiting for it
Mads Kiilerich <madski@unity3d.com>
parents: 20091
diff changeset
231 return self.timeout - timeout
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 23032
diff changeset
232 except error.LockHeld as inst:
1787
e431344e604c add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1753
diff changeset
233 if timeout != 0:
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
234 time.sleep(1)
1787
e431344e604c add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1753
diff changeset
235 if timeout > 0:
e431344e604c add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 1753
diff changeset
236 timeout -= 1
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
237 continue
7640
7197812e8d44 error: move lock errors
Matt Mackall <mpm@selenic.com>
parents: 4959
diff changeset
238 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc,
7197812e8d44 error: move lock errors
Matt Mackall <mpm@selenic.com>
parents: 4959
diff changeset
239 inst.locker)
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 503
diff changeset
240
26082
b188f60bd955 lock: make trylock private
Matt Mackall <mpm@selenic.com>
parents: 26081
diff changeset
241 def _trylock(self):
8108
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
242 if self.held:
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
243 self.held += 1
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
244 return
4947
3e25a6eb5c9a lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents: 3877
diff changeset
245 if lock._host is None:
30920
dc9f086c7691 lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents: 28959
diff changeset
246 lock._host = _getlockprefix()
31354
e6a2b625e0d9 lock: use %d to format integer into a bytestring
Augie Fackler <augie@google.com>
parents: 30921
diff changeset
247 lockname = '%s:%d' % (lock._host, self.pid)
26081
3b6e5914edd8 lock: loop a finite number of times in trylock (issue4787)
Matt Mackall <mpm@selenic.com>
parents: 25956
diff changeset
248 retry = 5
3b6e5914edd8 lock: loop a finite number of times in trylock (issue4787)
Matt Mackall <mpm@selenic.com>
parents: 25956
diff changeset
249 while not self.held and retry:
3b6e5914edd8 lock: loop a finite number of times in trylock (issue4787)
Matt Mackall <mpm@selenic.com>
parents: 25956
diff changeset
250 retry -= 1
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
251 try:
38038
8c828beb7543 lock: add internal config to not replace signal handlers while locking
Yuya Nishihara <yuya@tcha.org>
parents: 37659
diff changeset
252 with self._maybedelayedinterrupt():
36701
d77c3b023393 lock: block signal interrupt while making a lock file
Yuya Nishihara <yuya@tcha.org>
parents: 36657
diff changeset
253 self.vfs.makelock(lockname, self.f)
d77c3b023393 lock: block signal interrupt while making a lock file
Yuya Nishihara <yuya@tcha.org>
parents: 36657
diff changeset
254 self.held = 1
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 23032
diff changeset
255 except (OSError, IOError) as why:
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
256 if why.errno == errno.EEXIST:
26387
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
257 locker = self._readlock()
32087
e1938d6051da lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 31378
diff changeset
258 if locker is None:
e1938d6051da lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 31378
diff changeset
259 continue
e1938d6051da lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 31378
diff changeset
260
26387
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
261 # special case where a parent process holds the lock -- this
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
262 # is different from the pid being different because we do
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
263 # want the unlock and postrelease functions to be called,
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
264 # but the lockfile to not be removed.
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
265 if locker == self.parentlock:
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
266 self._parentheld = True
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
267 self.held = 1
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
268 return
e16f80f89a29 lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents: 26383
diff changeset
269 locker = self._testlock(locker)
3686
4308f4cdc07b Don't step into an endless loop when lock file is empty.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 2859
diff changeset
270 if locker is not None:
36657
214f61abd865 py3: back out c77c925987d7 to store bytes filename in IOError
Yuya Nishihara <yuya@tcha.org>
parents: 36642
diff changeset
271 raise error.LockHeld(errno.EAGAIN,
214f61abd865 py3: back out c77c925987d7 to store bytes filename in IOError
Yuya Nishihara <yuya@tcha.org>
parents: 36642
diff changeset
272 self.vfs.join(self.f), self.desc,
214f61abd865 py3: back out c77c925987d7 to store bytes filename in IOError
Yuya Nishihara <yuya@tcha.org>
parents: 36642
diff changeset
273 locker)
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
274 else:
7640
7197812e8d44 error: move lock errors
Matt Mackall <mpm@selenic.com>
parents: 4959
diff changeset
275 raise error.LockUnavailable(why.errno, why.strerror,
7197812e8d44 error: move lock errors
Matt Mackall <mpm@selenic.com>
parents: 4959
diff changeset
276 why.filename, self.desc)
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
277
32088
0d892d820a51 lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 32087
diff changeset
278 if not self.held:
0d892d820a51 lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 32087
diff changeset
279 # use empty locker to mean "busy for frequent lock/unlock
0d892d820a51 lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 32087
diff changeset
280 # by many processes"
0d892d820a51 lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 32087
diff changeset
281 raise error.LockHeld(errno.EAGAIN,
36657
214f61abd865 py3: back out c77c925987d7 to store bytes filename in IOError
Yuya Nishihara <yuya@tcha.org>
parents: 36642
diff changeset
282 self.vfs.join(self.f), self.desc, "")
32088
0d892d820a51 lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 32087
diff changeset
283
26290
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
284 def _readlock(self):
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
285 """read lock and return its value
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
286
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
287 Returns None if no lock exists, pid for old-style locks, and host:pid
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
288 for new-style locks.
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
289 """
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
290 try:
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
291 return self.vfs.readlock(self.f)
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
292 except (OSError, IOError) as why:
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
293 if why.errno == errno.ENOENT:
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
294 return None
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
295 raise
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
296
26291
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
297 def _testlock(self, locker):
26290
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
298 if locker is None:
9664d32bd6cb lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26082
diff changeset
299 return None
2579
0875cda033fd use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2016
diff changeset
300 try:
0875cda033fd use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2016
diff changeset
301 host, pid = locker.split(":", 1)
0875cda033fd use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2016
diff changeset
302 except ValueError:
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
303 return locker
4947
3e25a6eb5c9a lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents: 3877
diff changeset
304 if host != lock._host:
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
305 return locker
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
306 try:
2579
0875cda033fd use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 2016
diff changeset
307 pid = int(pid)
9685
a820cd39d415 lock: catch specific exceptions
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 9680
diff changeset
308 except ValueError:
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
309 return locker
37120
a8a902d7176e procutil: bulk-replace function calls to point to new module
Yuya Nishihara <yuya@tcha.org>
parents: 36701
diff changeset
310 if procutil.testpid(pid):
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
311 return locker
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
312 # if locker dead, break lock. must do this with another lock
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
313 # held, or can race and break valid lock.
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
314 try:
20091
abfe6a8e619b lock: take both vfs and lock file path relative to vfs to access via vfs
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 19927
diff changeset
315 l = lock(self.vfs, self.f + '.break', timeout=0)
abfe6a8e619b lock: take both vfs and lock file path relative to vfs to access via vfs
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 19927
diff changeset
316 self.vfs.unlink(self.f)
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
317 l.release()
7640
7197812e8d44 error: move lock errors
Matt Mackall <mpm@selenic.com>
parents: 4959
diff changeset
318 except error.LockError:
1877
d314a89fa4f1 change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1836
diff changeset
319 return locker
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
320
26291
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
321 def testlock(self):
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
322 """return id of locker if lock is valid, else None.
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
323
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
324 If old-style lock, we cannot tell what machine locker is on.
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
325 with new-style lock, if locker is on this machine, we can
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
326 see if locker is alive. If locker is on this machine but
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
327 not alive, we can safely break lock.
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
328
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
329 The lock file is only deleted when None is returned.
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
330
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
331 """
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
332 locker = self._readlock()
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
333 return self._testlock(locker)
1d33842c5b3e lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents: 26290
diff changeset
334
26473
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
335 @contextlib.contextmanager
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
336 def inherit(self):
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
337 """context for the lock to be inherited by a Mercurial subprocess.
26357
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
338
26473
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
339 Yields a string that will be recognized by the lock in the subprocess.
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
340 Communicating this string to the subprocess needs to be done separately
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
341 -- typically by an environment variable.
26357
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
342 """
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
343 if not self.held:
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
344 raise error.LockInheritanceContractViolation(
26473
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
345 'inherit can only be called while lock is held')
26357
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
346 if self._inherited:
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
347 raise error.LockInheritanceContractViolation(
26473
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
348 'inherit cannot be called while lock is already inherited')
26498
e8564e04382d lock: add a way to prevent locks from being inherited
Siddharth Agarwal <sid0@fb.com>
parents: 26474
diff changeset
349 if self._inheritchecker is not None:
e8564e04382d lock: add a way to prevent locks from being inherited
Siddharth Agarwal <sid0@fb.com>
parents: 26474
diff changeset
350 self._inheritchecker()
26357
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
351 if self.releasefn:
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
352 self.releasefn()
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
353 if self._parentheld:
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
354 lockname = self.parentlock
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
355 else:
37658
34758397ad1b py3: use b"%d" instead of str() to convert integers to bytes
Pulkit Goyal <7895pulkit@gmail.com>
parents: 37120
diff changeset
356 lockname = b'%s:%d' % (lock._host, self.pid)
26357
6979a1369185 lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents: 26356
diff changeset
357 self._inherited = True
26473
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
358 try:
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
359 yield lockname
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
360 finally:
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
361 if self.acquirefn:
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
362 self.acquirefn()
5f94e64f182c lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents: 26387
diff changeset
363 self._inherited = False
26358
de5a52e5eb9e lock: add a method to reacquire the lock after subprocesses exit
Siddharth Agarwal <sid0@fb.com>
parents: 26357
diff changeset
364
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
365 def release(self):
15583
926a06f7a353 lock: add mechanism to register post release callback
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 14494
diff changeset
366 """release the lock and execute callback function if any
926a06f7a353 lock: add mechanism to register post release callback
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 14494
diff changeset
367
17537
31f32a96e1e3 Merge spelling fixes
Bryan O'Sullivan <bryano@fb.com>
parents: 17427 17510
diff changeset
368 If the lock has been acquired multiple times, the actual release is
17510
7c44b703657b spelling: release
timeless@mozdev.org
parents: 15589
diff changeset
369 delayed to the last release call."""
8108
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
370 if self.held > 1:
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
371 self.held -= 1
9680
8cea86d73887 lock: use '==' instead of 'is' for integer equality ('is' may not work)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 9309
diff changeset
372 elif self.held == 1:
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
373 self.held = 0
26383
0fceb34806e1 lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents: 26359
diff changeset
374 if self._getpid() != self.pid:
18907
af9fa8d4c939 lock: if we fork, ensure that only the parent releases
Bryan O'Sullivan <bryano@fb.com>
parents: 17683
diff changeset
375 # we forked, and are not the parent
af9fa8d4c939 lock: if we fork, ensure that only the parent releases
Bryan O'Sullivan <bryano@fb.com>
parents: 17683
diff changeset
376 return
503
c6a2e41c8c60 Fix troubles with clone and exception handling
mpm@selenic.com
parents: 429
diff changeset
377 try:
23032
f484be02bd35 lock: while releasing, unlink lockfile even if the release function throws
Siddharth Agarwal <sid0@fb.com>
parents: 20380
diff changeset
378 if self.releasefn:
f484be02bd35 lock: while releasing, unlink lockfile even if the release function throws
Siddharth Agarwal <sid0@fb.com>
parents: 20380
diff changeset
379 self.releasefn()
f484be02bd35 lock: while releasing, unlink lockfile even if the release function throws
Siddharth Agarwal <sid0@fb.com>
parents: 20380
diff changeset
380 finally:
26359
c545d51c901e lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26358
diff changeset
381 if not self._parentheld:
c545d51c901e lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26358
diff changeset
382 try:
c545d51c901e lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26358
diff changeset
383 self.vfs.unlink(self.f)
c545d51c901e lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26358
diff changeset
384 except OSError:
c545d51c901e lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26358
diff changeset
385 pass
26474
431094a3b21f lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26473
diff changeset
386 # The postrelease functions typically assume the lock is not held
431094a3b21f lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26473
diff changeset
387 # at all.
431094a3b21f lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26473
diff changeset
388 if not self._parentheld:
431094a3b21f lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26473
diff changeset
389 for callback in self.postrelease:
431094a3b21f lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents: 26473
diff changeset
390 callback()
28959
518c3e392f75 lock: clear postrelease hooks list after usage
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28027
diff changeset
391 # Prevent double usage and help clear cycles.
518c3e392f75 lock: clear postrelease hooks list after usage
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28027
diff changeset
392 self.postrelease = None
161
0b4c5cb953d9 Simply repository locking
mpm@selenic.com
parents:
diff changeset
393
8108
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
394 def release(*locks):
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
395 for lock in locks:
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
396 if lock is not None:
a26d33749bd8 made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents: 7640
diff changeset
397 lock.release()