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a t�h� � @ s> d dl Z d dlZe �e�ZG dd� de�ZG dd� de�ZdS )� Nc @ s e Zd ZdS )� LockErrorN)�__name__� __module__� __qualname__� r r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/dogpile/util/readwrite_lock.pyr s r c @ s< e Zd ZdZdd� Zddd�Zdd� Zdd d �Zd d � Zd S )�ReadWriteMutexa� A mutex which allows multiple readers, single writer. :class:`.ReadWriteMutex` uses a Python ``threading.Condition`` to provide this functionality across threads within a process. The Beaker package also contained a file-lock based version of this concept, so that readers/writers could be synchronized across processes with a common filesystem. A future Dogpile release may include this additional class at some point. c C s d| _ d | _t�t�� �| _d S )Nr )�async_�current_sync_operation� threading� Condition�Lock� condition��selfr r r �__init__ s zReadWriteMutex.__init__Tc C s� | j �� z^|r(| jdurB| j �� qn| jdurBW | j �� dS | jd7 _t�d| � W | j �� n | j �� 0 |s~dS dS )zAcquire the 'read' lock.NF� z%s acquired read lockT)r �acquirer �wait�releaser �log�debug�r r r r r �acquire_read_lock" s �z ReadWriteMutex.acquire_read_lockc C sv | j �� zZ| jd8 _| jdkr:| jdurL| j �� n| jdk rLtd��t�d| � W | j �� n | j �� 0 dS )zRelease the 'read' lock.r r Nz7Synchronizer error - too many release_read_locks calledz%s released read lock) r r r r � notify_allr r r r r r r r �release_read_lock8 s �z ReadWriteMutex.release_read_lockc C s� | j �� z�|r(| jdurB| j �� qn| jdurBW | j �� dS t�� | _| jdkr||rf| j �� nd| _W | j �� dS t� d| � W | j �� n | j �� 0 |s�dS dS )zAcquire the 'write' lock.NFr z%s acquired write lockT) r r r r r r �current_threadr r r r r r r �acquire_write_lockN s* � �z!ReadWriteMutex.acquire_write_lockc C s\ | j �� z@| jt�� ur"td��d| _| j �� t�d| � W | j � � n | j � � 0 dS )zRelease the 'write' lock.z?Synchronizer error - current thread doesn't have the write lockNz%s released write lock) r r r r r r r r r r r r r r �release_write_lockt s � z!ReadWriteMutex.release_write_lockN)T)T) r r r �__doc__r r r r r r r r r r s &r ) �loggingr � getLoggerr r � Exceptionr �objectr r r r r �<module> s
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