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This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
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| dw xY w)zReturn 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: {})
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? ?s A 0A? SelectorKey)r r eventsdatazSelectorKey(fileobj, fd, events, data)
Object used to associate a file object to its backing
file descriptor, selected event mask, and attached data.
zFile object registered.zUnderlying file descriptor.z3Events that must be waited for on this file object.zvOptional opaque data associated to this file object.
For example, this could be used to store a per-client session ID.c ( e Zd ZdZd Zd Zd Zd Zy)_SelectorMappingz)Mapping of file objects to selector keys.c || _ y N) _selector)selfselectors r __init__z_SelectorMapping.__init__? s ! c @ t | j j S r )lenr
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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 t )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)
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NotImplementedErrorr r r r s r registerzBaseSelector.register_ s
* "!r c t )aj Unregister a file object.
Parameters:
fileobj -- file object or file descriptor
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SelectorKey instance
Raises:
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*not* raise OSError (even if the wrapped syscall does)
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" "!r c J | j | | j ||| S )ay Change a registered file object monitored events or attached data.
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:
Anything that unregister() or register() raises
)r< r: r9 s r modifyzBaseSelector.modify s#
}}Wfd33r c t )aq Perform the actual selection, until some monitored file objects are
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Returns:
list of (key, events) for ready file objects
`events` is a bitwise mask of EVENT_READ|EVENT_WRITE
r7 )r timeouts r selectzBaseSelector.select r= r c y)zmClose the selector.
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r c | j }| t d || S # t $ r t dj | dw xY w)zzReturn the key associated to a registered file object.
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c cY S w xY w)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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