Mercurial > hg
annotate mercurial/lock.py @ 26311:60dd8e3977f0
util: avoid mutable default arguments
I almost introduced a bug around this code by accidentally mutating a default
argument. There's no reason for these to exist.
author | Siddharth Agarwal <sid0@fb.com> |
---|---|
date | Tue, 22 Sep 2015 16:55:18 -0700 |
parents | 1d33842c5b3e |
children | db4c192cb9b3 |
rev | line source |
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9309
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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 from __future__ import absolute_import |
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9 |
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10 import errno |
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11 import os |
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12 import socket |
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13 import time |
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14 import warnings |
161 | 15 |
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16 from . import ( |
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17 error, |
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18 util, |
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19 ) |
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20 |
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21 class lock(object): |
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22 '''An advisory lock held by one process to control access to a set |
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23 of files. Non-cooperating processes or incorrectly written scripts |
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24 can ignore Mercurial's locking scheme and stomp all over the |
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25 repository, so don't do that. |
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26 |
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27 Typically used via localrepository.lock() to lock the repository |
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28 store (.hg/store/) or localrepository.wlock() to lock everything |
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29 else under .hg/.''' |
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30 |
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31 # lock is symlink on platforms that support it, file on others. |
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32 |
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33 # symlink is used because create of directory entry and contents |
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34 # are atomic even over nfs. |
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35 |
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36 # old-style lock: symlink to pid |
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37 # new-style lock: symlink to hostname:pid |
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38 |
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39 _host = None |
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40 |
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41 def __init__(self, vfs, file, timeout=-1, releasefn=None, desc=None): |
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42 self.vfs = vfs |
161 | 43 self.f = file |
44 self.held = 0 | |
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45 self.timeout = timeout |
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46 self.releasefn = releasefn |
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47 self.desc = desc |
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48 self.postrelease = [] |
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49 self.pid = os.getpid() |
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50 self.delay = self.lock() |
161 | 51 |
52 def __del__(self): | |
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53 if self.held: |
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54 warnings.warn("use lock.release instead of del lock", |
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55 category=DeprecationWarning, |
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56 stacklevel=2) |
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57 |
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58 # ensure the lock will be removed |
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59 # even if recursive locking did occur |
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60 self.held = 1 |
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61 |
161 | 62 self.release() |
63 | |
64 def lock(self): | |
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65 timeout = self.timeout |
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66 while True: |
161 | 67 try: |
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68 self._trylock() |
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69 return self.timeout - timeout |
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70 except error.LockHeld as inst: |
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71 if timeout != 0: |
161 | 72 time.sleep(1) |
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73 if timeout > 0: |
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74 timeout -= 1 |
161 | 75 continue |
7640 | 76 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
77 inst.locker) | |
515 | 78 |
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79 def _trylock(self): |
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80 if self.held: |
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81 self.held += 1 |
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82 return |
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83 if lock._host is None: |
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84 lock._host = socket.gethostname() |
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85 lockname = '%s:%s' % (lock._host, self.pid) |
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86 retry = 5 |
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87 while not self.held and retry: |
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88 retry -= 1 |
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89 try: |
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90 self.vfs.makelock(lockname, self.f) |
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91 self.held = 1 |
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92 except (OSError, IOError) as why: |
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93 if why.errno == errno.EEXIST: |
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94 locker = self.testlock() |
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95 if locker is not None: |
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96 raise error.LockHeld(errno.EAGAIN, |
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97 self.vfs.join(self.f), self.desc, |
7640 | 98 locker) |
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99 else: |
7640 | 100 raise error.LockUnavailable(why.errno, why.strerror, |
101 why.filename, self.desc) | |
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102 |
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103 def _readlock(self): |
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104 """read lock and return its value |
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105 |
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106 Returns None if no lock exists, pid for old-style locks, and host:pid |
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107 for new-style locks. |
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108 """ |
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109 try: |
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110 return self.vfs.readlock(self.f) |
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111 except (OSError, IOError) as why: |
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112 if why.errno == errno.ENOENT: |
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113 return None |
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114 raise |
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115 |
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116 def _testlock(self, locker): |
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117 if locker is None: |
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118 return None |
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119 try: |
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120 host, pid = locker.split(":", 1) |
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121 except ValueError: |
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122 return locker |
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123 if host != lock._host: |
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124 return locker |
161 | 125 try: |
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126 pid = int(pid) |
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127 except ValueError: |
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128 return locker |
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129 if util.testpid(pid): |
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130 return locker |
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131 # if locker dead, break lock. must do this with another lock |
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132 # held, or can race and break valid lock. |
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133 try: |
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134 l = lock(self.vfs, self.f + '.break', timeout=0) |
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135 self.vfs.unlink(self.f) |
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136 l.release() |
7640 | 137 except error.LockError: |
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138 return locker |
161 | 139 |
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140 def testlock(self): |
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141 """return id of locker if lock is valid, else None. |
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142 |
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143 If old-style lock, we cannot tell what machine locker is on. |
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144 with new-style lock, if locker is on this machine, we can |
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145 see if locker is alive. If locker is on this machine but |
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146 not alive, we can safely break lock. |
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147 |
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148 The lock file is only deleted when None is returned. |
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149 |
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150 """ |
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151 locker = self._readlock() |
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152 return self._testlock(locker) |
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153 |
161 | 154 def release(self): |
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155 """release the lock and execute callback function if any |
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156 |
17537 | 157 If the lock has been acquired multiple times, the actual release is |
17510 | 158 delayed to the last release call.""" |
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159 if self.held > 1: |
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160 self.held -= 1 |
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161 elif self.held == 1: |
161 | 162 self.held = 0 |
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163 if os.getpid() != self.pid: |
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164 # we forked, and are not the parent |
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165 return |
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166 try: |
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167 if self.releasefn: |
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168 self.releasefn() |
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169 finally: |
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170 try: |
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171 self.vfs.unlink(self.f) |
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172 except OSError: |
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173 pass |
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174 for callback in self.postrelease: |
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175 callback() |
161 | 176 |
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177 def release(*locks): |
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178 for lock in locks: |
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179 if lock is not None: |
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180 lock.release() |