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§ÚêLc @ sË d Z d d k Z d d k Z d d k Z d d k Z d d k Z d d k l Z l Z l Z l
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h Z n Xd „ Z d e f d „ ƒ YZ e e e f Z d „ Z d „ Z d „ Z d
„ Z d e d „ Z d e d
„ 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 i( d j o9 d d k) Z) d f d „ ƒ YZ* d e$ f d „ ƒ YZ+ 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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