File: //lib64/python3.8/__pycache__/selectors.cpython-38.pyc
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This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
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rJ td| dY nX |dk rbtd||S )zReturn a file descriptor from a file object.
Parameters:
fileobj -- file object or file descriptor
Returns:
corresponding file descriptor
Raises:
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zInvalid file object: {!r}Nr zInvalid file descriptor: {})
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r SelectorKeyr 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.zzOptional opaque data associated to this file object.
For example, this could be used to store a per-client session ID.c @ s0 e Zd ZdZdd Zdd Zdd Zdd Zd
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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
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
NNotImplementedErrorr r r r r r r register_ s zBaseSelector.registerc C s t dS )aj Unregister a file object.
Parameters:
fileobj -- file object or file descriptor
Returns:
SelectorKey instance
Raises:
KeyError if fileobj is not registered
Note:
If fileobj is registered but has since been closed this does
*not* raise OSError (even if the wrapped syscall does)
Nr. )r r r r r
unregisterv 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
)r2 r1 r0 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
file object becomes ready
Returns:
list of (key, events) for ready file objects
`events` is a bitwise mask of EVENT_READ|EVENT_WRITE
Nr. )r timeoutr r r select s zBaseSelector.selectc C s dS )zmClose the selector.
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rH | j D ] }|j|kr$|j Y S q$ Y nX dS )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
is used by unregister() so we can unregister an object that
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r" Y dS X dS )zReturn the key associated to a given file descriptor.
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