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dkr�e�e�ndS(s`Synchronization metaclass.

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    call must be matched by a release() call and only the last
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    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:

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    __count is the number of times the current thread has acquired it

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