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for it.
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status, false is returned.
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sl gU R R 5 SU l SU l g)z�Acquire the lock in read mode.
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� lock_readr s r r( �CountedLock.lock_read< s; � � �?�?� � � �� !� � �O�O� %� %� '� �D� � !�D�Or Nc �r � U R S:X aF U R R US9U l SU l U =R S-
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sl U R $ )a Acquire the lock in write mode.
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then validate that we already hold the real
lock with this token.
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