Mercurial > hg
annotate mercurial/lock.py @ 29922:ae933e3e2226
revset: remove showwarning option from expandaliases()
Now all callers pass showwarning=ui.warn, so we no longer need the option to
suppress warnings.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Thu, 08 Sep 2016 22:44:10 +0900 |
parents | 518c3e392f75 |
children | dc9f086c7691 |
rev | line source |
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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 contextlib |
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11 import errno |
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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, acquirefn=None, |
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42 desc=None, inheritchecker=None, parentlock=None): |
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43 self.vfs = vfs |
161 | 44 self.f = file |
45 self.held = 0 | |
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46 self.timeout = timeout |
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47 self.releasefn = releasefn |
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48 self.acquirefn = acquirefn |
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49 self.desc = desc |
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50 self._inheritchecker = inheritchecker |
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51 self.parentlock = parentlock |
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52 self._parentheld = False |
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53 self._inherited = False |
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54 self.postrelease = [] |
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55 self.pid = self._getpid() |
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56 self.delay = self.lock() |
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57 if self.acquirefn: |
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58 self.acquirefn() |
161 | 59 |
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60 def __enter__(self): |
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61 return self |
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62 |
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63 def __exit__(self, exc_type, exc_value, exc_tb): |
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64 self.release() |
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65 |
161 | 66 def __del__(self): |
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67 if self.held: |
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68 warnings.warn("use lock.release instead of del lock", |
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69 category=DeprecationWarning, |
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70 stacklevel=2) |
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71 |
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72 # ensure the lock will be removed |
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73 # even if recursive locking did occur |
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74 self.held = 1 |
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75 |
161 | 76 self.release() |
77 | |
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78 def _getpid(self): |
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79 # wrapper around util.getpid() to make testing easier |
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80 return util.getpid() |
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81 |
161 | 82 def lock(self): |
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83 timeout = self.timeout |
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84 while True: |
161 | 85 try: |
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86 self._trylock() |
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87 return self.timeout - timeout |
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88 except error.LockHeld as inst: |
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89 if timeout != 0: |
161 | 90 time.sleep(1) |
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91 if timeout > 0: |
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92 timeout -= 1 |
161 | 93 continue |
7640 | 94 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
95 inst.locker) | |
515 | 96 |
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97 def _trylock(self): |
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98 if self.held: |
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99 self.held += 1 |
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100 return |
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101 if lock._host is None: |
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102 lock._host = socket.gethostname() |
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103 lockname = '%s:%s' % (lock._host, self.pid) |
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104 retry = 5 |
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105 while not self.held and retry: |
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106 retry -= 1 |
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107 try: |
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108 self.vfs.makelock(lockname, self.f) |
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109 self.held = 1 |
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110 except (OSError, IOError) as why: |
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111 if why.errno == errno.EEXIST: |
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112 locker = self._readlock() |
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113 # special case where a parent process holds the lock -- this |
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114 # is different from the pid being different because we do |
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115 # want the unlock and postrelease functions to be called, |
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116 # but the lockfile to not be removed. |
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117 if locker == self.parentlock: |
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118 self._parentheld = True |
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119 self.held = 1 |
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120 return |
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121 locker = self._testlock(locker) |
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122 if locker is not None: |
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123 raise error.LockHeld(errno.EAGAIN, |
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124 self.vfs.join(self.f), self.desc, |
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126 else: |
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128 why.filename, self.desc) | |
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129 |
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130 def _readlock(self): |
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131 """read lock and return its value |
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132 |
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133 Returns None if no lock exists, pid for old-style locks, and host:pid |
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134 for new-style locks. |
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135 """ |
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136 try: |
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137 return self.vfs.readlock(self.f) |
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138 except (OSError, IOError) as why: |
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139 if why.errno == errno.ENOENT: |
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140 return None |
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141 raise |
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142 |
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143 def _testlock(self, locker): |
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144 if locker is None: |
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145 return None |
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146 try: |
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147 host, pid = locker.split(":", 1) |
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148 except ValueError: |
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149 return locker |
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150 if host != lock._host: |
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151 return locker |
161 | 152 try: |
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153 pid = int(pid) |
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154 except ValueError: |
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155 return locker |
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156 if util.testpid(pid): |
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157 return locker |
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158 # if locker dead, break lock. must do this with another lock |
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159 # held, or can race and break valid lock. |
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160 try: |
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161 l = lock(self.vfs, self.f + '.break', timeout=0) |
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162 self.vfs.unlink(self.f) |
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163 l.release() |
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165 return locker |
161 | 166 |
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167 def testlock(self): |
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168 """return id of locker if lock is valid, else None. |
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169 |
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170 If old-style lock, we cannot tell what machine locker is on. |
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171 with new-style lock, if locker is on this machine, we can |
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172 see if locker is alive. If locker is on this machine but |
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173 not alive, we can safely break lock. |
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174 |
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175 The lock file is only deleted when None is returned. |
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176 |
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177 """ |
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178 locker = self._readlock() |
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179 return self._testlock(locker) |
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180 |
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181 @contextlib.contextmanager |
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182 def inherit(self): |
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183 """context for the lock to be inherited by a Mercurial subprocess. |
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184 |
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185 Yields a string that will be recognized by the lock in the subprocess. |
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186 Communicating this string to the subprocess needs to be done separately |
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187 -- typically by an environment variable. |
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188 """ |
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189 if not self.held: |
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190 raise error.LockInheritanceContractViolation( |
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191 'inherit can only be called while lock is held') |
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192 if self._inherited: |
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193 raise error.LockInheritanceContractViolation( |
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194 'inherit cannot be called while lock is already inherited') |
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195 if self._inheritchecker is not None: |
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196 self._inheritchecker() |
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197 if self.releasefn: |
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198 self.releasefn() |
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199 if self._parentheld: |
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200 lockname = self.parentlock |
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201 else: |
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202 lockname = '%s:%s' % (lock._host, self.pid) |
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203 self._inherited = True |
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204 try: |
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205 yield lockname |
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206 finally: |
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207 if self.acquirefn: |
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208 self.acquirefn() |
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209 self._inherited = False |
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210 |
161 | 211 def release(self): |
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212 """release the lock and execute callback function if any |
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213 |
17537 | 214 If the lock has been acquired multiple times, the actual release is |
17510 | 215 delayed to the last release call.""" |
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216 if self.held > 1: |
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217 self.held -= 1 |
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218 elif self.held == 1: |
161 | 219 self.held = 0 |
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220 if self._getpid() != self.pid: |
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221 # we forked, and are not the parent |
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222 return |
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223 try: |
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224 if self.releasefn: |
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225 self.releasefn() |
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226 finally: |
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227 if not self._parentheld: |
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228 try: |
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229 self.vfs.unlink(self.f) |
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230 except OSError: |
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231 pass |
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232 # The postrelease functions typically assume the lock is not held |
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233 # at all. |
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234 if not self._parentheld: |
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235 for callback in self.postrelease: |
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236 callback() |
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237 # Prevent double usage and help clear cycles. |
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238 self.postrelease = None |
161 | 239 |
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240 def release(*locks): |
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241 for lock in locks: |
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242 if lock is not None: |
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243 lock.release() |