Selectors module in python














































Selectors module in python



Introduction

This module allows high-level and efficient I/O multiplexing, built upon the select module primitives. Users are encouraged to use this module instead, unless they want precise control over the OS-level primitives used.

It defines a BaseSelector abstract base class, along with several concrete implementations (KqueueSelector, EpollSelector%u2026), that can be used to wait for I/O readiness notification on multiple file objects. In the following, %u201Cfile object%u201D refers to any object with a fileno() method, or a raw file descriptor. See file object.

DefaultSelector is an alias to the most efficient implementation available on the current platform: this should be the default choice for most users.

note that The type of file objects supported depends on the platform: on Windows, sockets are supported, but not pipes, whereas on Unix, both are supported

Classes:

Classes hierarchy:

BaseSelector
+-- SelectSelector
+-- PollSelector
+-- EpollSelector
+-- DevpollSelector
+-- KqueueSelector

In the following, events is a bitwise mask indicating which I/O events should be waited for on a given file object. It can be a combination of the modules constants below:

Constant

Meaning

EVENT_READ

Available for read

EVENT_WRITE

Available for write


More Articles of Tejas Vir:

Name Views Likes
Some more methods under dispatcher class 290 3
More Textbox Object methods 272 3
Introduction to fcntl and ioctl system calls 524 3
Encode and decode Files using python (Binhex) 355 4
Introduction to asyncore in Python 281 3
Resource usage in python 298 3
some more functions related to fcntl and ioctl 290 3
Introduction to locale module in python 378 3
Introduction to nis module 600 3
Introduction To Mailcap File Handling 402 3
dispatcher class in asyncore 278 3
How to format and parse Number using locale module 305 3
How to format currency using Locale module 352 3
Selectors module in python 315 3
Textbox object in curses.textbox 266 3
Introduction to tty module in python 363 3
Baseselector class in selectors 281 3
Introduction to curses.textpad 390 3
Resource Usage information using python 334 3
How to find list of available Locales and Get an existing Locale 433 3
How to format date and time using Locale module 310 3
Example of Basic http client using asyncore 270 3
Methods that can be overriden in dispatcher class using asyncore module 262 3
Constants Related to Resource Limits in python 271 3
More classes of asyncore module 263 3

Comments