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authorFred Drake <fdrake@acm.org>1998-05-07 01:49:07 (GMT)
committerFred Drake <fdrake@acm.org>1998-05-07 01:49:07 (GMT)
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-\section{Standard Module \module{Queue}}
-\stmodindex{Queue}
-\label{module-Queue}
-
-
-The \module{Queue} module implements a multi-producer, multi-consumer
-FIFO queue. It is especially useful in threads programming when
-information must be exchanged safely between multiple threads. The
-\class{Queue} class in this module implements all the required locking
-semantics. It depends on the availability of thread support in
-Python.
-
-The \module{Queue} module defines the following class and exception:
-
-
-\begin{classdesc}{Queue}{maxsize}
-Constructor for the class. \var{maxsize} is an integer that sets the
-upperbound limit on the number of items that can be placed in the
-queue. Insertion will block once this size has been reached, until
-queue items are consumed. If \var{maxsize} is less than or equal to
-zero, the queue size is infinite.
-\end{classdesc}
-
-\begin{excdesc}{Empty}
-Exception raised when non-blocking get (e.g. \method{get_nowait()}) is
-called on a \class{Queue} object which is empty, or for which the
-emptyiness cannot be determined (i.e. because the appropriate locks
-cannot be acquired).
-\end{excdesc}
-
-\subsection{Queue Objects}
-\label{QueueObjects}
-
-Class \class{Queue} implements queue objects and has the methods
-described below. This class can be derived from in order to implement
-other queue organizations (e.g. stack) but the inheritable interface
-is not described here. See the source code for details. The public
-methods are:
-
-\begin{methoddesc}{qsize}{}
-Returns the approximate size of the queue. Because of multithreading
-semantics, this number is not reliable.
-\end{methoddesc}
-
-\begin{methoddesc}{empty}{}
-Returns \code{1} if the queue is empty, \code{0} otherwise. Because
-of multithreading semantics, this is not reliable.
-\end{methoddesc}
-
-\begin{methoddesc}{full}{}
-Returns \code{1} if the queue is full, \code{0} otherwise. Because of
-multithreading semantics, this is not reliable.
-\end{methoddesc}
-
-\begin{methoddesc}{put}{item}
-Puts \var{item} into the queue.
-\end{methoddesc}
-
-\begin{methoddesc}{get}{}
-Gets and returns an item from the queue, blocking if necessary until
-one is available.
-\end{methoddesc}
-
-\begin{methoddesc}{get_nowait}{}
-Gets and returns an item from the queue if one is immediately
-available. Raises an \exception{Empty} exception if the queue is
-empty or if the queue's emptiness cannot be determined.
-\end{methoddesc}