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This module allows high-level and efficient I/O multiplexing, built upon the
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C sd t | tr| }n:zt| }W n( tttfyH td| dY n0 |dk r`td||S )zReturn a file descriptor from a file object.
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dS ) 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 dS )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
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NNotImplementedErrorr r r r r r r register` s zBaseSelector.registerc C s t dS )aj Unregister a file object.
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*not* raise OSError (even if the wrapped syscall does)
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unregisterw s zBaseSelector.unregisterc C s | | | |||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
)r3 r2 r1 r r r modify s
zBaseSelector.modifyc C s t dS )aq Perform the actual selection, until some monitored file objects are
ready or a timeout expires.
Parameters:
timeout -- if timeout > 0, this specifies the maximum wait time, in
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
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Nr/ )r timeoutr r r select s zBaseSelector.selectc C s dS )zmClose the selector.
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t |W S tyF | j D ] }|j|u r"|j Y S q" Y n0 dS )al Return a file descriptor from a file object.
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corresponding key, or None if not found
N)r r& )r r r r r _key_from_fd s z _BaseSelectorImpl._key_from_fd)N)N) r* r+ r, r- r r% r2 r3 r4 r7 r8 rK r r r r r@ s
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