Mercurial > hg
annotate mercurial/lock.py @ 19423:5046fede7684
gendoc: rename to showdoc from show_doc
This function prints hg.1.gendoc.txt content.
author | Takumi IINO <trot.thunder@gmail.com> |
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date | Wed, 03 Jul 2013 21:49:37 +0900 |
parents | af9fa8d4c939 |
children | 76c83107a724 |
rev | line source |
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localrepo: document the locking scheme a little better
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1 # lock.py - simple advisory locking scheme for mercurial |
161 | 2 # |
2859 | 3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
161 | 4 # |
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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 |
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8 import util, error |
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9 import errno, os, socket, time |
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10 import warnings |
161 | 11 |
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12 class lock(object): |
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13 '''An advisory lock held by one process to control access to a set |
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14 of files. Non-cooperating processes or incorrectly written scripts |
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15 can ignore Mercurial's locking scheme and stomp all over the |
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16 repository, so don't do that. |
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17 |
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18 Typically used via localrepository.lock() to lock the repository |
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19 store (.hg/store/) or localrepository.wlock() to lock everything |
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20 else under .hg/.''' |
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21 |
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22 # lock is symlink on platforms that support it, file on others. |
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23 |
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24 # symlink is used because create of directory entry and contents |
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25 # are atomic even over nfs. |
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26 |
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27 # old-style lock: symlink to pid |
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28 # new-style lock: symlink to hostname:pid |
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29 |
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30 _host = None |
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31 |
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32 def __init__(self, file, timeout=-1, releasefn=None, desc=None): |
161 | 33 self.f = file |
34 self.held = 0 | |
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35 self.timeout = timeout |
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36 self.releasefn = releasefn |
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37 self.desc = desc |
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38 self.postrelease = [] |
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39 self.pid = os.getpid() |
161 | 40 self.lock() |
41 | |
42 def __del__(self): | |
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43 if self.held: |
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44 warnings.warn("use lock.release instead of del lock", |
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45 category=DeprecationWarning, |
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46 stacklevel=2) |
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47 |
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48 # ensure the lock will be removed |
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49 # even if recursive locking did occur |
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50 self.held = 1 |
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51 |
161 | 52 self.release() |
53 | |
54 def lock(self): | |
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55 timeout = self.timeout |
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56 while True: |
161 | 57 try: |
58 self.trylock() | |
59 return 1 | |
7640 | 60 except error.LockHeld, inst: |
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61 if timeout != 0: |
161 | 62 time.sleep(1) |
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63 if timeout > 0: |
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64 timeout -= 1 |
161 | 65 continue |
7640 | 66 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
67 inst.locker) | |
515 | 68 |
161 | 69 def trylock(self): |
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70 if self.held: |
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71 self.held += 1 |
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72 return |
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73 if lock._host is None: |
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74 lock._host = socket.gethostname() |
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75 lockname = '%s:%s' % (lock._host, self.pid) |
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76 while not self.held: |
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77 try: |
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78 util.makelock(lockname, self.f) |
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79 self.held = 1 |
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80 except (OSError, IOError), why: |
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81 if why.errno == errno.EEXIST: |
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82 locker = self.testlock() |
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83 if locker is not None: |
7640 | 84 raise error.LockHeld(errno.EAGAIN, self.f, self.desc, |
85 locker) | |
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86 else: |
7640 | 87 raise error.LockUnavailable(why.errno, why.strerror, |
88 why.filename, self.desc) | |
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89 |
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90 def testlock(self): |
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91 """return id of locker if lock is valid, else None. |
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92 |
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93 If old-style lock, we cannot tell what machine locker is on. |
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94 with new-style lock, if locker is on this machine, we can |
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95 see if locker is alive. If locker is on this machine but |
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96 not alive, we can safely break lock. |
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97 |
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98 The lock file is only deleted when None is returned. |
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99 |
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100 """ |
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101 try: |
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102 locker = util.readlock(self.f) |
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103 except OSError, why: |
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104 if why.errno == errno.ENOENT: |
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105 return None |
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106 raise |
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107 try: |
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108 host, pid = locker.split(":", 1) |
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109 except ValueError: |
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110 return locker |
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111 if host != lock._host: |
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112 return locker |
161 | 113 try: |
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114 pid = int(pid) |
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115 except ValueError: |
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116 return locker |
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117 if util.testpid(pid): |
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118 return locker |
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119 # if locker dead, break lock. must do this with another lock |
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120 # held, or can race and break valid lock. |
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121 try: |
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122 l = lock(self.f + '.break', timeout=0) |
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123 util.unlink(self.f) |
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124 l.release() |
7640 | 125 except error.LockError: |
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126 return locker |
161 | 127 |
128 def release(self): | |
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129 """release the lock and execute callback function if any |
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130 |
17537 | 131 If the lock has been acquired multiple times, the actual release is |
17510 | 132 delayed to the last release call.""" |
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133 if self.held > 1: |
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134 self.held -= 1 |
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135 elif self.held == 1: |
161 | 136 self.held = 0 |
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137 if os.getpid() != self.pid: |
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lock: if we fork, ensure that only the parent releases
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parents:
17683
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138 # 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
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139 return |
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
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140 if self.releasefn: |
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
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141 self.releasefn() |
503
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
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142 try: |
13281
95de08ffa324
lock: use util.unlink (issue2537)
Adrian Buehlmann <adrian@cadifra.com>
parents:
10263
diff
changeset
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143 util.unlink(self.f) |
9685
a820cd39d415
lock: catch specific exceptions
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
9680
diff
changeset
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144 except OSError: |
a820cd39d415
lock: catch specific exceptions
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
9680
diff
changeset
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145 pass |
15589
cc24e4ed3e0c
lock: change name of release chain
Matt Mackall <mpm@selenic.com>
parents:
15583
diff
changeset
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146 for callback in self.postrelease: |
15583
926a06f7a353
lock: add mechanism to register post release callback
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents:
14494
diff
changeset
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147 callback() |
161 | 148 |
8108
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
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149 def release(*locks): |
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
diff
changeset
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150 for lock in locks: |
a26d33749bd8
made repo locks recursive and deprecate refcounting based lock releasing
Ronny Pfannschmidt <Ronny.Pfannschmidt@gmx.de>
parents:
7640
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151 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
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152 lock.release() |