Mercurial > hg
annotate mercurial/lock.py @ 23991:07c1a7d1ef69
subrepo: add 'cat' support for git subrepos
V2: use 'self._ctx.node()' instead of 'rev' in makefileobj.
As Matt Harbison mentioned, using 'rev' does not make sense,
since we'd be passing a git revision to the top-level
Mercurial repository.
author | Mathias De Maré <mathias.demare@gmail.com> |
---|---|
date | Sun, 01 Feb 2015 14:09:31 +0100 |
parents | f484be02bd35 |
children | 328739ea70c3 |
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, vfs, file, timeout=-1, releasefn=None, desc=None): |
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33 self.vfs = vfs |
161 | 34 self.f = file |
35 self.held = 0 | |
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36 self.timeout = timeout |
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37 self.releasefn = releasefn |
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38 self.desc = desc |
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39 self.postrelease = [] |
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40 self.pid = os.getpid() |
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41 self.delay = self.lock() |
161 | 42 |
43 def __del__(self): | |
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44 if self.held: |
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45 warnings.warn("use lock.release instead of del lock", |
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46 category=DeprecationWarning, |
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47 stacklevel=2) |
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48 |
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49 # ensure the lock will be removed |
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50 # even if recursive locking did occur |
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51 self.held = 1 |
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52 |
161 | 53 self.release() |
54 | |
55 def lock(self): | |
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56 timeout = self.timeout |
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57 while True: |
161 | 58 try: |
59 self.trylock() | |
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60 return self.timeout - timeout |
7640 | 61 except error.LockHeld, inst: |
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62 if timeout != 0: |
161 | 63 time.sleep(1) |
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64 if timeout > 0: |
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65 timeout -= 1 |
161 | 66 continue |
7640 | 67 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
68 inst.locker) | |
515 | 69 |
161 | 70 def trylock(self): |
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71 if self.held: |
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72 self.held += 1 |
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73 return |
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74 if lock._host is None: |
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75 lock._host = socket.gethostname() |
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76 lockname = '%s:%s' % (lock._host, self.pid) |
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77 while not self.held: |
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78 try: |
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79 self.vfs.makelock(lockname, self.f) |
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80 self.held = 1 |
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81 except (OSError, IOError), why: |
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82 if why.errno == errno.EEXIST: |
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83 locker = self.testlock() |
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84 if locker is not None: |
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85 raise error.LockHeld(errno.EAGAIN, |
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86 self.vfs.join(self.f), self.desc, |
7640 | 87 locker) |
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88 else: |
7640 | 89 raise error.LockUnavailable(why.errno, why.strerror, |
90 why.filename, self.desc) | |
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91 |
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92 def testlock(self): |
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93 """return id of locker if lock is valid, else None. |
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94 |
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95 If old-style lock, we cannot tell what machine locker is on. |
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96 with new-style lock, if locker is on this machine, we can |
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97 see if locker is alive. If locker is on this machine but |
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98 not alive, we can safely break lock. |
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99 |
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100 The lock file is only deleted when None is returned. |
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101 |
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102 """ |
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103 try: |
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104 locker = self.vfs.readlock(self.f) |
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105 except (OSError, IOError), why: |
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106 if why.errno == errno.ENOENT: |
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107 return None |
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108 raise |
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109 try: |
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110 host, pid = locker.split(":", 1) |
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111 except ValueError: |
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112 return locker |
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113 if host != lock._host: |
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114 return locker |
161 | 115 try: |
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116 pid = int(pid) |
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117 except ValueError: |
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118 return locker |
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119 if util.testpid(pid): |
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120 return locker |
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121 # if locker dead, break lock. must do this with another lock |
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122 # held, or can race and break valid lock. |
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123 try: |
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124 l = lock(self.vfs, self.f + '.break', timeout=0) |
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125 self.vfs.unlink(self.f) |
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126 l.release() |
7640 | 127 except error.LockError: |
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128 return locker |
161 | 129 |
130 def release(self): | |
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131 """release the lock and execute callback function if any |
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132 |
17537 | 133 If the lock has been acquired multiple times, the actual release is |
17510 | 134 delayed to the last release call.""" |
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135 if self.held > 1: |
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136 self.held -= 1 |
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137 elif self.held == 1: |
161 | 138 self.held = 0 |
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139 if os.getpid() != self.pid: |
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140 # we forked, and are not the parent |
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141 return |
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142 try: |
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143 if self.releasefn: |
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144 self.releasefn() |
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145 finally: |
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146 try: |
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147 self.vfs.unlink(self.f) |
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148 except OSError: |
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149 pass |
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150 for callback in self.postrelease: |
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151 callback() |
161 | 152 |
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153 def release(*locks): |
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154 for lock in locks: |
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155 if lock is not None: |
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156 lock.release() |