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@s'dZddlmZddlZddlZddlZddlZddlZeed�smej	e_
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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
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    Base class for error arising from attempts to acquire the lock.

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    ...   raise LockError
    ... except Error:
    ...   pass
    N)rrrrrrrrrVsc@seZdZdZdS)rz�Raised when lock creation fails within a user-defined period of time.

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    ...   raise LockTimeout
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    N)rrrrrrrrrbsc@seZdZdZdS)rz�Some other thread/process is locking the file.

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    N)rrrrrrrrrmsc@seZdZdZdS)r	z�Lock file creation failed for some other reason.

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    Base class for errors arising from attempts to release the lock.

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    N)rrrrrrrrr
�sc@seZdZdZdS)rz�Raised when an attempt is made to unlock an unlocked file.

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    ...   raise NotLocked
    ... except UnlockError:
    ...   pass
    N)rrrrrrrrr�sc@seZdZdZdS)rz�Raised when an attempt is made to unlock a file someone else locked.

    >>> try:
    ...   raise NotMyLock
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        Acquire the lock.

        * If timeout is omitted (or None), wait forever trying to lock the
          file.

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        * If timeout <= 0, raise AlreadyLocked immediately if the file is
          already locked.
        zimplement in subclassN)�NotImplemented)r�timeoutrrr�acquire�sz_SharedBase.acquirecCstd��dS)zX
        Release the lock.

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        Context manager support.
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�Z�S)rz.Base class for platform-specific lock classes.TNcs�tt|�j|�tjj|�d|_tj�|_	tj
�|_|r�tj
�}t|dt|��}d|d@|_n	d|_tjj|j�}tjj|d|j	|j|jt|j�f�|_||_dS)zi
        >>> lock = LockBase('somefile')
        >>> lock = LockBase('somefile', threaded=False)
        z.lock�identz-%xl���z	%s%s.%s%sN)�superrr�osr�abspathZ	lock_file�socket�gethostname�hostname�getpid�pid�	threadingr�getattr�hashZtname�dirname�join�unique_namer)rr�threadedr�tr$r1)r"rrr�s 			zLockBase.__init__cCstd��dS)z9
        Tell whether or not the file is locked.
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        Return True if this object is locking the file.
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        Remove a lock.  Useful if a locking thread failed to unlock.
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rFcOs&ddlm}t|jd||�S)z�Factory function provided for backwards compatibility.

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    r;)�linklockfilezlockfile.linklockfile)r%rGrF�LinkLockFile)rDrErGrrrr
scOs&ddlm}t|jd||�S)z�Factory function provided for backwards compatibility.

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    r;)�
mkdirlockfilezlockfile.mkdirlockfile)r%rIrF�
MkdirLockFile)rDrErIrrrr%scOs&ddlm}t|jd||�S)z�Factory function provided for backwards compatibility.

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    lockfile.mkdirlockfile module.
    r;)�sqlitelockfilezlockfile.sqlitelockfile)r%rKrFZSQLiteLockFile)rDrErKrrrr0scs��fdd�}|S)aDecorator which enables locks for decorated function.

    Arguments:
     - path: path for lockfile.
     - timeout (optional): Timeout for acquiring lock.

     Usage:
         @locked('/var/run/myname', timeout=0)
         def myname(...):
             ...
    cs+tj�����fdd��}|S)Nc
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Name	Type	Size	Permission
__init__.cpython-35.opt-1.pyc	File	10 KB	0644
__init__.cpython-35.pyc	File	10 KB	0644
linklockfile.cpython-35.opt-1.pyc	File	2.34 KB	0644
linklockfile.cpython-35.pyc	File	2.34 KB	0644
mkdirlockfile.cpython-35.opt-1.pyc	File	2.75 KB	0644
mkdirlockfile.cpython-35.pyc	File	2.75 KB	0644
pidlockfile.cpython-35.opt-1.pyc	File	4.91 KB	0644
pidlockfile.cpython-35.pyc	File	4.91 KB	0644
sqlitelockfile.cpython-35.opt-1.pyc	File	3.92 KB	0644
sqlitelockfile.cpython-35.pyc	File	3.92 KB	0644
symlinklockfile.cpython-35.opt-1.pyc	File	2.21 KB	0644
symlinklockfile.cpython-35.pyc	File	2.21 KB	0644
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