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e fB @ s d Z d d l m Z m Z d d l m Z m Z d d l Z d d l Z d d l Z d Z
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This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
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C s t | t r | } nL y t | j } Wn3 t t t f k
rc t d j | d Yn X| d k r t d j | n | S)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: {})
isinstanceintfilenoAttributeError TypeError
ValueErrorformat)fileobjfd r ./opt/alt/python34/lib64/python3.4/selectors.py_fileobj_to_fd s r SelectorKeyr r eventsdatac @ sF e Z d Z d Z d d Z d d Z d d Z d d Z d
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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
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the underlying system call (if a system call is made)
Note:
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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:
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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
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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
r& metaclassc @ s| e Z d Z d Z d d Z d d Z d d d Z d d
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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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was previously registered even if it is closed. It is also
used by _SelectorMapping.
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Z S) PollSelectorzPoll-based selector.c s t j t j | _ d S)N)r@ r r, rS _poll)r )rD r r r Q s
zPollSelector.__init__Nc sl t j | | | } d } | t @r8 | t j O} n | t @rR | t j O} n | j j | j | | S)Nr ) r@ r( r9 r, POLLINr: POLLOUTrU r )r r r r r8 Z poll_events)rD r r r( U s
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