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lockfile.py - Platform-independent advisory file locks.
Requires Python 2.5 unless you apply 2.4.diff
Locking is done on a per-thread basis instead of a per-process basis.
Usage:
>>> lock = LockFile('somefile')
>>> try:
... lock.acquire()
... except AlreadyLocked:
... print 'somefile', 'is locked already.'
... except LockFailed:
... print 'somefile', 'can\'t be locked.'
... else:
... print 'got lock'
got lock
>>> print lock.is_locked()
True
>>> lock.release()
>>> lock = LockFile('somefile')
>>> print lock.is_locked()
False
>>> with lock:
... print lock.is_locked()
True
>>> print lock.is_locked()
False
>>> lock = LockFile('somefile')
>>> # It is okay to lock twice from the same thread...
>>> with lock:
... lock.acquire()
...
>>> # Though no counter is kept, so you can't unlock multiple times...
>>> print lock.is_locked()
False
Exceptions:
Error - base class for other exceptions
LockError - base class for all locking exceptions
AlreadyLocked - Another thread or process already holds the lock
LockFailed - Lock failed for some other reason
UnlockError - base class for all unlocking exceptions
AlreadyUnlocked - File was not locked.
NotMyLock - File was locked but not by the current thread/process
i ( t absolute_importNt current_threadt get_namet Errort LockErrort LockTimeoutt
AlreadyLockedt
LockFailedt UnlockErrort NotLockedt NotMyLockt LinkFileLockt
MkdirFileLockt SQLiteFileLockt LockBaset lockedc B@ s e Z d Z RS( sw
Base class for other exceptions.
>>> try:
... raise Error
... except Exception:
... pass
( t __name__t
__module__t __doc__( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR J s c B@ s e Z d Z RS( s
Base class for error arising from attempts to acquire the lock.
>>> try:
... raise LockError
... except Error:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR V s c B@ s e Z d Z RS( s Raised when lock creation fails within a user-defined period of time.
>>> try:
... raise LockTimeout
... except LockError:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR b s c B@ s e Z d Z RS( s Some other thread/process is locking the file.
>>> try:
... raise AlreadyLocked
... except LockError:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR m s c B@ s e Z d Z RS( s Lock file creation failed for some other reason.
>>> try:
... raise LockFailed
... except LockError:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR x s c B@ s e Z d Z RS( s
Base class for errors arising from attempts to release the lock.
>>> try:
... raise UnlockError
... except Error:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR s c B@ s e Z d Z RS( s Raised when an attempt is made to unlock an unlocked file.
>>> try:
... raise NotLocked
... except UnlockError:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR s c B@ s e Z d Z RS( s Raised when an attempt is made to unlock a file someone else locked.
>>> try:
... raise NotMyLock
... except UnlockError:
... pass
( R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR
s t _SharedBasec B@ sA e Z d Z d d Z d Z d Z d Z d Z RS( c C@ s
| | _ d S( N( t path( t selfR ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt __init__ s c C@ s t d d S( s
Acquire the lock.
* If timeout is omitted (or None), wait forever trying to lock the
file.
* If timeout > 0, try to acquire the lock for that many seconds. If
the lock period expires and the file is still locked, raise
LockTimeout.
* If timeout <= 0, raise AlreadyLocked immediately if the file is
already locked.
s implement in subclassN( t NotImplemented( R t timeout( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt acquire s c C@ s t d d S( sX
Release the lock.
If the file is not locked, raise NotLocked.
s implement in subclassN( R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt release s c C@ s | j | S( s*
Context manager support.
( R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt __enter__ s
c G@ s | j d S( s*
Context manager support.
N( R ( R t _exc( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt __exit__ s c C@ s d | j j | j f S( Ns <%s: %r>( t __class__R R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt __repr__ s N( R R R t NoneR R R R R ( ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR s c B@ sA e Z d Z e d d Z d Z d Z d Z d Z RS( s. Base class for platform-specific lock classes.c C@ s t t | j | t j j | d | _ t j | _ t j
| _ | r t j
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>>> lock = LockBase('somefile')
>>> lock = LockBase('somefile', threaded=False)
s .lockt idents -%xI t s %s%s.%s%sN( t superR R t osR t abspatht lock_filet sockett gethostnamet hostnamet getpidt pidt threadingR t getattrt hasht tnamet dirnamet joint unique_nameR ( R R t threadedR t tR! R0 ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR s c C@ s t d d S( s9
Tell whether or not the file is locked.
s implement in subclassN( R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt is_locked s c C@ s t d d S( sA
Return True if this object is locking the file.
s implement in subclassN( R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt i_am_locking s c C@ s t d d S( sN
Remove a lock. Useful if a locking thread failed to unlock.
s implement in subclassN( R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyt
break_lock s c C@ s d | j j | j | j f S( Ns <%s: %r -- %r>( R R R2 R ( R ( ( sA /usr/lib/python2.7/site-packages/pip/_vendor/lockfile/__init__.pyR s N(
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