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This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
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rc t d j | � � d � Yn X| d k r� t d j | � � � n | S)z�Return a file descriptor from a file object.
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d S)� 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)�NotImplementedError)r r r r r r r �registerU s zBaseSelector.registerc C s
t � d S)aj Unregister a file object.
Parameters:
fileobj -- file object or file descriptor
Returns:
SelectorKey instance
Raises:
KeyError if fileobj is not registered
Note:
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*not* raise OSError (even if the wrapped syscall does)
N)r' )r r r r r �
unregisterl s zBaseSelector.unregisterc C s | 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( )r r r r r r r �modify s
zBaseSelector.modifyc C s
t � d S)aq Perform the actual selection, until some monitored file objects are
ready or a timeout expires.
Parameters:
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seconds
if timeout <= 0, the select() call won't block, and will
report the currently ready file objects
if timeout is None, select() will block until a monitored
file object becomes ready
Returns:
list of (key, events) for ready file objects
`events` is a bitwise mask of EVENT_READ|EVENT_WRITE
N)r' )r �timeoutr r r �select� s zBaseSelector.selectc C s d S)zmClose the selector.
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Nr )r r r r �close� s zBaseSelector.closec C s^ | j � } y! | d k r$ t � n | | SWn* t k
rY t d j | � � d � Yn Xd S)zzReturn the key associated to a registered file object.
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t � d S)z2Return a mapping of file objects to selector keys.N)r' )r r r r r. � s zBaseSelector.get_mapc C s | S)Nr )r r r r � __enter__� s zBaseSelector.__enter__c G s | j � d S)N)r- )r �argsr r r �__exit__� s zBaseSelector.__exit__)r" r# r$ r% r r( r) r* r, r- r0 r. r1 r3 r r r r r& F s
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d d � Z d S)�_BaseSelectorImplz Base selector implementation.c C s i | _ t | � | _ d S)N)r r �_map)r r r r r � s z_BaseSelectorImpl.__init__c C sZ y t | � SWnE t k
rU x- | j j � D] } | j | k r. | j Sq. W� Yn Xd S)al Return a file descriptor from a file object.
This wraps _fileobj_to_fd() to do an exhaustive search in case
the object is invalid but we still have it in our map. This
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