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m”þfc @ s d Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l m Z m Z m
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„ Z& e& Z' d e( e$ e$ d „ Z) d f d „ ƒ YZ* d e* f d „ ƒ YZ+ d „ Z, e$ e( d „ Z- e j. d k rÿd d l/ Z/ d f d „ ƒ YZ0 d e* f d „ ƒ YZ1 n d S( s Basic infrastructure for asynchronous socket service clients and servers.
There are only two ways to have a program on a single processor do "more
than one thing at a time". Multi-threaded programming is the simplest and
most popular way to do it, but there is another very different technique,
that lets you have nearly all the advantages of multi-threading, without
actually using multiple threads. it's really only practical if your program
is largely I/O bound. If your program is CPU bound, then pre-emptive
scheduled threads are probably what you really need. Network servers are
rarely CPU-bound, however.
If your operating system supports the select() system call in its I/O
library (and nearly all do), then you can use it to juggle multiple
communication channels at once; doing other work while your I/O is taking
place in the "background." Although this strategy can seem strange and
complex, especially at first, it is in many ways easier to understand and
control than multi-threaded programming. The module documented here solves
many of the difficult problems for you, making the task of building
sophisticated high-performance network servers and clients a snap.
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