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This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
é )ÚABCMetaÚabstractmethod)Ú
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rc t d j | ƒ ƒ d ‚ Yn X| d k r… t d j | ƒ ƒ ‚ | S)zÕReturn a file descriptor from a file object.
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corresponding file descriptor
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zInvalid file object: {!r}Nr zInvalid file descriptor: {})Ú
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Object used to associate a file object to its backing
file descriptor, selected event mask, and attached data.
é é zFile object registered.zUnderlying file descriptor.z3Events that must be waited for on this file object.zzOptional opaque data associated to this file object.
For example, this could be used to store a per-client session ID.c @ sF e Z d Z d Z d d „ Z d d „ Z d d „ Z d d „ Z d
S) Ú_SelectorMappingz)Mapping of file objects to selector keys.c C s
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d S)Ú BaseSelectora- Selector abstract base class.
A selector supports registering file objects to be monitored for specific
I/O events.
A file object is a file descriptor or any object with a `fileno()` method.
An arbitrary object can be attached to the file object, which can be used
for example to store context information, a callback, etc.
A selector can use various implementations (select(), poll(), epoll()...)
depending on the platform. The default `Selector` class uses the most
efficient implementation on the current platform.
Nc C s
t ‚ d S)a3 Register a file object.
Parameters:
fileobj -- file object or file descriptor
events -- events to monitor (bitwise mask of EVENT_READ|EVENT_WRITE)
data -- attached data
Returns:
SelectorKey instance
Raises:
ValueError if events is invalid
KeyError if fileobj is already registered
OSError if fileobj is closed or otherwise is unacceptable to
the underlying system call (if a system call is made)
Note:
OSError may or may not be raised
N)ÚNotImplementedError)r r r r r r r Úregister^ s zBaseSelector.registerc C s
t ‚ d S)aj Unregister a file object.
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unregisteru s zBaseSelector.unregisterc C s | j | ƒ | j | | | ƒ S)ay Change a registered file object monitored events or attached data.
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data -- attached data
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SelectorKey instance
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)r+ r* )r r r r r r r Úmodifyˆ s
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t ‚ d S)aq Perform the actual selection, until some monitored file objects are
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report the currently ready file objects
if timeout is None, select() will block until a monitored
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list of (key, events) for ready file objects
`events` is a bitwise mask of EVENT_READ|EVENT_WRITE
N)r) )r Útimeoutr r r Úselect™ s zBaseSelector.selectc C s d S)zmClose the selector.
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r\ t d j | ƒ ƒ d ‚ Yn Xd S)zzReturn the key associated to a registered file object.
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rU x- | j j ƒ D] } | j | k r. | j Sq. W‚ Yn Xd S)al Return a file descriptor from a file object.
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the object is invalid but we still have it in our map. This
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