Mercurial > hg
annotate mercurial/lock.py @ 9469:7f0f882af23d
config: abort on indented non-continuation lines (issue1829)
Previously, as soon as a continuation would be met, "cont" would stay
forever set to True, but "item" was set back to "None".
This caused the continuation code bits to run every time, until the next
"self.get(section, item) + '\n'" which would crash.
author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
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date | Sat, 12 Sep 2009 11:17:07 +0200 |
parents | b87a50b7125c |
children | cfdcb7a465af |
rev | line source |
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161 | 1 # lock.py - simple locking scheme for mercurial |
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 |
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6 # GNU General Public License version 2, incorporated herein by reference. |
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 # lock is symlink on platforms that support it, file on others. |
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14 |
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15 # symlink is used because create of directory entry and contents |
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16 # are atomic even over nfs. |
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17 |
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18 # old-style lock: symlink to pid |
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19 # new-style lock: symlink to hostname:pid |
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20 |
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21 _host = None |
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22 |
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23 def __init__(self, file, timeout=-1, releasefn=None, desc=None): |
161 | 24 self.f = file |
25 self.held = 0 | |
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26 self.timeout = timeout |
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27 self.releasefn = releasefn |
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28 self.desc = desc |
161 | 29 self.lock() |
30 | |
31 def __del__(self): | |
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32 if self.held: |
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33 warnings.warn("use lock.release instead of del lock", |
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34 category=DeprecationWarning, |
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35 stacklevel=2) |
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36 |
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37 # ensure the lock will be removed |
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38 # even if recursive locking did occur |
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39 self.held = 1 |
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40 |
161 | 41 self.release() |
42 | |
43 def lock(self): | |
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44 timeout = self.timeout |
161 | 45 while 1: |
46 try: | |
47 self.trylock() | |
48 return 1 | |
7640 | 49 except error.LockHeld, inst: |
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50 if timeout != 0: |
161 | 51 time.sleep(1) |
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52 if timeout > 0: |
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53 timeout -= 1 |
161 | 54 continue |
7640 | 55 raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc, |
56 inst.locker) | |
515 | 57 |
161 | 58 def trylock(self): |
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59 if self.held: |
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60 self.held += 1 |
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61 return |
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62 if lock._host is None: |
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63 lock._host = socket.gethostname() |
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64 lockname = '%s:%s' % (lock._host, os.getpid()) |
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65 while not self.held: |
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66 try: |
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67 util.makelock(lockname, self.f) |
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68 self.held = 1 |
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69 except (OSError, IOError), why: |
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70 if why.errno == errno.EEXIST: |
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71 locker = self.testlock() |
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72 if locker is not None: |
7640 | 73 raise error.LockHeld(errno.EAGAIN, self.f, self.desc, |
74 locker) | |
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75 else: |
7640 | 76 raise error.LockUnavailable(why.errno, why.strerror, |
77 why.filename, self.desc) | |
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78 |
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79 def testlock(self): |
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80 """return id of locker if lock is valid, else None. |
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81 |
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82 If old-style lock, we cannot tell what machine locker is on. |
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83 with new-style lock, if locker is on this machine, we can |
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84 see if locker is alive. If locker is on this machine but |
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85 not alive, we can safely break lock. |
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86 |
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87 The lock file is only deleted when None is returned. |
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88 |
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89 """ |
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90 locker = util.readlock(self.f) |
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91 try: |
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92 host, pid = locker.split(":", 1) |
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93 except ValueError: |
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94 return locker |
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95 if host != lock._host: |
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96 return locker |
161 | 97 try: |
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98 pid = int(pid) |
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99 except: |
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100 return locker |
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101 if util.testpid(pid): |
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102 return locker |
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103 # if locker dead, break lock. must do this with another lock |
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104 # held, or can race and break valid lock. |
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105 try: |
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106 l = lock(self.f + '.break') |
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107 l.trylock() |
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108 os.unlink(self.f) |
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109 l.release() |
7640 | 110 except error.LockError: |
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111 return locker |
161 | 112 |
113 def release(self): | |
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114 if self.held > 1: |
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115 self.held -= 1 |
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116 elif self.held is 1: |
161 | 117 self.held = 0 |
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118 if self.releasefn: |
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119 self.releasefn() |
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120 try: |
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121 os.unlink(self.f) |
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122 except: pass |
161 | 123 |
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124 def release(*locks): |
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125 for lock in locks: |
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126 if lock is not None: |
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127 lock.release() |
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128 |