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d k r� e � e � n d S( s` Synchronization metaclass.
This metaclass makes it possible to declare synchronized methods.
i����Nt Lockc B s, e Z d Z d � Z d d � Z d � Z RS( s� Reentrant lock.
This is a mutex-like object which can be acquired by the same
thread more than once. It keeps a reference count of the number
of times it has been acquired by the same thread. Each acquire()
call must be matched by a release() call and only the last
release() call actually releases the lock for acquisition by
another thread.
The implementation uses two locks internally:
__mutex is a short term lock used to protect the instance variables
__wait is the lock for which other threads wait
A thread intending to acquire both locks should acquire __wait
first.
The implementation uses two other instance variables, protected by
locking __mutex:
__tid is the thread ID of the thread that currently has the lock
__count is the number of times the current thread has acquired it
When the lock is released, __tid is None and __count is zero.
c C s4 t j � | _ t j � | _ d | _ d | _ d S( s0 Constructor. Initialize all instance variables.i N( t threadt
allocate_lockt _Lock__mutext _Lock__waitt Nonet
_Lock__tidt _Lock__count( t self( ( s. /usr/lib64/python2.7/Demo/metaclasses/Synch.pyt __init__* s i c C s� | j j � z- | j t j � k r9 | j d | _ d SWd | j j � X| j j | � } | ro | ro d Sz- | j j � t j � | _ d | _ d SWd | j j � Xd S( s} Acquire the lock.
If the optional flag argument is false, returns immediately
when it cannot acquire the __wait lock without blocking (it
may still block for a little while in order to acquire the
__mutex lock).
The return value is only relevant when the flag argument is
false; it is 1 if the lock is acquired, 0 if not.
i Ni ( R t acquireR R t get_identR t releaseR ( R t flagt locked( ( s. /usr/lib64/python2.7/Demo/metaclasses/Synch.pyR
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