Mercurial > hg
annotate mercurial/lock.py @ 36160:9fd8c2a3db5a
narrowspec: move module into core
Having support for parsing the narrow specification in core is
necessary for moving many other parts of narrow to core.
We do still want to harmonize the narrow spec with the sparse
spec. And the format needs to be documented. But this shouldn't
hold up the code moving to core.
Differential Revision: https://phab.mercurial-scm.org/D2201
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Mon, 12 Feb 2018 16:21:34 -0800 |
parents | 4b1c04082cdc |
children | c303eda316be |
rev | line source |
---|---|
9309
cfdcb7a465af
localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents:
8312
diff
changeset
|
1 # lock.py - simple advisory locking scheme for mercurial |
161 | 2 # |
2859 | 3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
161 | 4 # |
8225
46293a0c7e9f
updated license to be explicit about GPL version 2
Martin Geisler <mg@lazybytes.net>
parents:
8113
diff
changeset
|
5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
161 | 7 |
25956
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
8 from __future__ import absolute_import |
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
9 |
26473
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
10 import contextlib |
25956
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
11 import errno |
30921
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
12 import os |
25956
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
13 import socket |
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
14 import time |
8113
87a1605979e4
add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
8108
diff
changeset
|
15 import warnings |
161 | 16 |
35208
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
17 from .i18n import _ |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
18 |
25956
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
19 from . import ( |
31375
d57aa655ce97
lock: encode result of gethostname into a bytestring
Augie Fackler <augie@google.com>
parents:
31354
diff
changeset
|
20 encoding, |
25956
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
21 error, |
30921
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
22 pycompat, |
25956
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
23 util, |
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
24 ) |
8cd30e9277ae
lock: use absolute_import
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25660
diff
changeset
|
25 |
30920
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
26 def _getlockprefix(): |
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
27 """Return a string which is used to differentiate pid namespaces |
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
28 |
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
29 It's useful to detect "dead" processes and remove stale locks with |
30921
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
30 confidence. Typically it's just hostname. On modern linux, we include an |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
31 extra Linux-specific pid namespace identifier. |
30920
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
32 """ |
35897
4b1c04082cdc
py3: replace "if ispy3" by encoding.strtolocal()
Yuya Nishihara <yuya@tcha.org>
parents:
35209
diff
changeset
|
33 result = encoding.strtolocal(socket.gethostname()) |
30921
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
34 if pycompat.sysplatform.startswith('linux'): |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
35 try: |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
36 result += '/%x' % os.stat('/proc/self/ns/pid').st_ino |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
37 except OSError as ex: |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
38 if ex.errno not in (errno.ENOENT, errno.EACCES, errno.ENOTDIR): |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
39 raise |
1f151a33af8e
lock: include Linux pid namespace identifier in prefix
Jun Wu <quark@fb.com>
parents:
30920
diff
changeset
|
40 return result |
30920
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
41 |
35209
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
42 def trylock(ui, vfs, lockname, timeout, warntimeout, *args, **kwargs): |
35208
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
43 """return an acquired lock or raise an a LockHeld exception |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
44 |
35209
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
45 This function is responsible to issue warnings and or debug messages about |
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
46 the held lock while trying to acquires it.""" |
35208
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
47 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
48 def printwarning(printer, locker): |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
49 """issue the usual "waiting on lock" message through any channel""" |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
50 # show more details for new-style locks |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
51 if ':' in locker: |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
52 host, pid = locker.split(":", 1) |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
53 msg = _("waiting for lock on %s held by process %r " |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
54 "on host %r\n") % (l.desc, pid, host) |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
55 else: |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
56 msg = _("waiting for lock on %s held by %r\n") % (l.desc, locker) |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
57 printer(msg) |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
58 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
59 l = lock(vfs, lockname, 0, *args, dolock=False, **kwargs) |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
60 |
35209
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
61 debugidx = 0 if (warntimeout and timeout) else -1 |
35208
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
62 warningidx = 0 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
63 if not timeout: |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
64 warningidx = -1 |
35209
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
65 elif warntimeout: |
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
66 warningidx = warntimeout |
35208
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
67 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
68 delay = 0 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
69 while True: |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
70 try: |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
71 l._trylock() |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
72 break |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
73 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
|
74 if delay == debugidx: |
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
75 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
|
76 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
|
77 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
|
78 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
|
79 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
|
80 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
|
81 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
|
82 delay += 1 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
83 |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
84 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
|
85 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
|
86 if 0 <= warningidx <= l.delay: |
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
87 ui.warn(_("got lock after %s seconds\n") % l.delay) |
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
88 else: |
9153871d50e0
lock: allow to configure when the lock messages are displayed
Boris Feld <boris.feld@octobus.net>
parents:
35208
diff
changeset
|
89 ui.debug("got lock after %s 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
|
90 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
|
91 l.acquirefn() |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
92 return l |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
93 |
1559
59b3639df0a9
Convert all classes to new-style classes by deriving them from object.
Eric Hopper <hopper@omnifarious.org>
parents:
1530
diff
changeset
|
94 class lock(object): |
9309
cfdcb7a465af
localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents:
8312
diff
changeset
|
95 '''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
|
96 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
|
97 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
|
98 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
|
99 |
cfdcb7a465af
localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents:
8312
diff
changeset
|
100 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
|
101 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
|
102 else under .hg/.''' |
cfdcb7a465af
localrepo: document the locking scheme a little better
Greg Ward <greg-hg@gerg.ca>
parents:
8312
diff
changeset
|
103 |
1877
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
104 # 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
|
105 |
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
106 # 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
|
107 # 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
|
108 |
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
109 # 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
|
110 # 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
|
111 |
4947
3e25a6eb5c9a
lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents:
3877
diff
changeset
|
112 _host = None |
3e25a6eb5c9a
lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents:
3877
diff
changeset
|
113 |
26321
db4c192cb9b3
lock: move acquirefn call to inside the lock
Siddharth Agarwal <sid0@fb.com>
parents:
26291
diff
changeset
|
114 def __init__(self, vfs, file, 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
|
115 desc=None, inheritchecker=None, parentlock=None, |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
116 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
|
117 self.vfs = vfs |
161 | 118 self.f = file |
119 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
|
120 self.timeout = timeout |
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
diff
changeset
|
121 self.releasefn = releasefn |
26321
db4c192cb9b3
lock: move acquirefn call to inside the lock
Siddharth Agarwal <sid0@fb.com>
parents:
26291
diff
changeset
|
122 self.acquirefn = acquirefn |
2016
ff5c9a92f556
fix backtrace printed when cannot get lock.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1877
diff
changeset
|
123 self.desc = desc |
26498
e8564e04382d
lock: add a way to prevent locks from being inherited
Siddharth Agarwal <sid0@fb.com>
parents:
26474
diff
changeset
|
124 self._inheritchecker = inheritchecker |
26356
927fa07a2ba4
lock: introduce state to keep track of inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26321
diff
changeset
|
125 self.parentlock = parentlock |
927fa07a2ba4
lock: introduce state to keep track of inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26321
diff
changeset
|
126 self._parentheld = False |
927fa07a2ba4
lock: introduce state to keep track of inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26321
diff
changeset
|
127 self._inherited = False |
15589
cc24e4ed3e0c
lock: change name of release chain
Matt Mackall <mpm@selenic.com>
parents:
15583
diff
changeset
|
128 self.postrelease = [] |
26383
0fceb34806e1
lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents:
26359
diff
changeset
|
129 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
|
130 if dolock: |
1b758105b5c7
lock: add a trylock method handling the timeout and messaging logic
Boris Feld <boris.feld@octobus.net>
parents:
32088
diff
changeset
|
131 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
|
132 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
|
133 self.acquirefn() |
161 | 134 |
27797
054abf2377e8
lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents:
26498
diff
changeset
|
135 def __enter__(self): |
054abf2377e8
lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents:
26498
diff
changeset
|
136 return self |
054abf2377e8
lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents:
26498
diff
changeset
|
137 |
054abf2377e8
lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents:
26498
diff
changeset
|
138 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
|
139 self.release() |
054abf2377e8
lock: turn a lock into a Python context manager
Bryan O'Sullivan <bryano@fb.com>
parents:
26498
diff
changeset
|
140 |
161 | 141 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
|
142 if self.held: |
8113
87a1605979e4
add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
8108
diff
changeset
|
143 warnings.warn("use lock.release instead of del lock", |
87a1605979e4
add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
8108
diff
changeset
|
144 category=DeprecationWarning, |
87a1605979e4
add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
8108
diff
changeset
|
145 stacklevel=2) |
87a1605979e4
add a deprecation warning for gc based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
8108
diff
changeset
|
146 |
8108
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
|
147 # 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
|
148 # 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
|
149 self.held = 1 |
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
|
150 |
161 | 151 self.release() |
152 | |
26383
0fceb34806e1
lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents:
26359
diff
changeset
|
153 def _getpid(self): |
28027
14033c5dd261
util: enable getpid to be replaced
timeless <timeless@mozdev.org>
parents:
27797
diff
changeset
|
154 # wrapper around util.getpid() to make testing easier |
14033c5dd261
util: enable getpid to be replaced
timeless <timeless@mozdev.org>
parents:
27797
diff
changeset
|
155 return util.getpid() |
26383
0fceb34806e1
lock: add a wrapper to os.getpid() to make testing easier
Siddharth Agarwal <sid0@fb.com>
parents:
26359
diff
changeset
|
156 |
161 | 157 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
|
158 timeout = self.timeout |
14494
1ffeeb91c55d
check-code: flag 0/1 used as constant Boolean expression
Martin Geisler <mg@lazybytes.net>
parents:
13281
diff
changeset
|
159 while True: |
161 | 160 try: |
26082
b188f60bd955
lock: make trylock private
Matt Mackall <mpm@selenic.com>
parents:
26081
diff
changeset
|
161 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
|
162 return self.timeout - timeout |
25660
328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
23032
diff
changeset
|
163 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
|
164 if timeout != 0: |
161 | 165 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
|
166 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
|
167 timeout -= 1 |
161 | 168 continue |
7640 | 169 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
170 inst.locker) | |
515 | 171 |
26082
b188f60bd955
lock: make trylock private
Matt Mackall <mpm@selenic.com>
parents:
26081
diff
changeset
|
172 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
|
173 if self.held: |
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
|
174 self.held += 1 |
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
|
175 return |
4947
3e25a6eb5c9a
lock.py: cache hostname, but not pid, in case we fork
Bryan O'Sullivan <bos@serpentine.com>
parents:
3877
diff
changeset
|
176 if lock._host is None: |
30920
dc9f086c7691
lock: move lock._host calculation to a function
Jun Wu <quark@fb.com>
parents:
28959
diff
changeset
|
177 lock._host = _getlockprefix() |
31354
e6a2b625e0d9
lock: use %d to format integer into a bytestring
Augie Fackler <augie@google.com>
parents:
30921
diff
changeset
|
178 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
|
179 retry = 5 |
3b6e5914edd8
lock: loop a finite number of times in trylock (issue4787)
Matt Mackall <mpm@selenic.com>
parents:
25956
diff
changeset
|
180 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
|
181 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
|
182 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
|
183 self.vfs.makelock(lockname, 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
|
184 self.held = 1 |
25660
328739ea70c3
global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents:
23032
diff
changeset
|
185 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
|
186 if why.errno == errno.EEXIST: |
26387
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
187 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
|
188 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
|
189 continue |
e1938d6051da
lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
31378
diff
changeset
|
190 |
26387
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
191 # 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
|
192 # 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
|
193 # 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
|
194 # but the lockfile to not be removed. |
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
195 if locker == self.parentlock: |
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
196 self._parentheld = True |
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
197 self.held = 1 |
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
198 return |
e16f80f89a29
lock: recognize parent locks while acquiring
Siddharth Agarwal <sid0@fb.com>
parents:
26383
diff
changeset
|
199 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
|
200 if locker is not None: |
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
|
201 raise error.LockHeld(errno.EAGAIN, |
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
|
202 self.vfs.join(self.f), self.desc, |
7640 | 203 locker) |
1877
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
204 else: |
7640 | 205 raise error.LockUnavailable(why.errno, why.strerror, |
206 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
|
207 |
32088
0d892d820a51
lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
32087
diff
changeset
|
208 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
|
209 # 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
|
210 # by many processes" |
0d892d820a51
lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
32087
diff
changeset
|
211 raise error.LockHeld(errno.EAGAIN, |
0d892d820a51
lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
32087
diff
changeset
|
212 self.vfs.join(self.f), self.desc, "") |
0d892d820a51
lock: avoid unintentional lock acquisition at failure of readlock
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
32087
diff
changeset
|
213 |
26290
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
214 def _readlock(self): |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
215 """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
|
216 |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
217 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
|
218 for new-style locks. |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
219 """ |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
220 try: |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
221 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
|
222 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
|
223 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
|
224 return None |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
225 raise |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
226 |
26291
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
227 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
|
228 if locker is None: |
9664d32bd6cb
lock: factor code to read lock into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26082
diff
changeset
|
229 return None |
2579
0875cda033fd
use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
2016
diff
changeset
|
230 try: |
0875cda033fd
use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
2016
diff
changeset
|
231 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
|
232 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
|
233 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
|
234 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
|
235 return locker |
161 | 236 try: |
2579
0875cda033fd
use __contains__, index or split instead of str.find
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
2016
diff
changeset
|
237 pid = int(pid) |
9685
a820cd39d415
lock: catch specific exceptions
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
9680
diff
changeset
|
238 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
|
239 return locker |
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
240 if util.testpid(pid): |
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
241 return locker |
d314a89fa4f1
change lock format to let us detect and break stale locks.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1836
diff
changeset
|
242 # 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
|
243 # 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
|
244 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
|
245 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
|
246 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
|
247 l.release() |
7640 | 248 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
|
249 return locker |
161 | 250 |
26291
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
251 def testlock(self): |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
252 """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
|
253 |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
254 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
|
255 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
|
256 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
|
257 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
|
258 |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
259 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
|
260 |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
261 """ |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
262 locker = self._readlock() |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
263 return self._testlock(locker) |
1d33842c5b3e
lock: factor out lock testing into a separate function
Siddharth Agarwal <sid0@fb.com>
parents:
26290
diff
changeset
|
264 |
26473
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
265 @contextlib.contextmanager |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
266 def inherit(self): |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
267 """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
|
268 |
26473
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
269 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
|
270 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
|
271 -- 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
|
272 """ |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
273 if not self.held: |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
274 raise error.LockInheritanceContractViolation( |
26473
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
275 '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
|
276 if self._inherited: |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
277 raise error.LockInheritanceContractViolation( |
26473
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
278 '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
|
279 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
|
280 self._inheritchecker() |
26357
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
281 if self.releasefn: |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
282 self.releasefn() |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
283 if self._parentheld: |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
284 lockname = self.parentlock |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
285 else: |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
286 lockname = '%s:%s' % (lock._host, self.pid) |
6979a1369185
lock: add a method to prepare the lock for inheritance
Siddharth Agarwal <sid0@fb.com>
parents:
26356
diff
changeset
|
287 self._inherited = True |
26473
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
288 try: |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
289 yield lockname |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
290 finally: |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
291 if self.acquirefn: |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
292 self.acquirefn() |
5f94e64f182c
lock: turn prepinherit/reacquire into a single context manager
Siddharth Agarwal <sid0@fb.com>
parents:
26387
diff
changeset
|
293 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
|
294 |
161 | 295 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
|
296 """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
|
297 |
17537 | 298 If the lock has been acquired multiple times, the actual release is |
17510 | 299 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
|
300 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
|
301 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
|
302 elif self.held == 1: |
161 | 303 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
|
304 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
|
305 # 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
|
306 return |
503
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
|
307 try: |
23032
f484be02bd35
lock: while releasing, unlink lockfile even if the release function throws
Siddharth Agarwal <sid0@fb.com>
parents:
20380
diff
changeset
|
308 if self.releasefn: |
f484be02bd35
lock: while releasing, unlink lockfile even if the release function throws
Siddharth Agarwal <sid0@fb.com>
parents:
20380
diff
changeset
|
309 self.releasefn() |
f484be02bd35
lock: while releasing, unlink lockfile even if the release function throws
Siddharth Agarwal <sid0@fb.com>
parents:
20380
diff
changeset
|
310 finally: |
26359
c545d51c901e
lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26358
diff
changeset
|
311 if not self._parentheld: |
c545d51c901e
lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26358
diff
changeset
|
312 try: |
c545d51c901e
lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26358
diff
changeset
|
313 self.vfs.unlink(self.f) |
c545d51c901e
lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26358
diff
changeset
|
314 except OSError: |
c545d51c901e
lock.release: do not unlink inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26358
diff
changeset
|
315 pass |
26474
431094a3b21f
lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26473
diff
changeset
|
316 # 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
|
317 # at all. |
431094a3b21f
lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26473
diff
changeset
|
318 if not self._parentheld: |
431094a3b21f
lock.release: don't call postrelease functions for inherited locks
Siddharth Agarwal <sid0@fb.com>
parents:
26473
diff
changeset
|
319 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
|
320 callback() |
28959
518c3e392f75
lock: clear postrelease hooks list after usage
Gregory Szorc <gregory.szorc@gmail.com>
parents:
28027
diff
changeset
|
321 # 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
|
322 self.postrelease = None |
161 | 323 |
8108
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
|
324 def release(*locks): |
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
|
325 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
|
326 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
|
327 lock.release() |