[Tutor] Should I be thinking of threads for this ?

Andreas Kostyrka andreas at kostyrka.org
Fri Aug 26 19:39:40 CEST 2005

Am Donnerstag, den 25.08.2005, 20:28 +0100 schrieb Nick Lunt:
> Hello folks,
> I have the following code taken from the Twisted examples -
> [code]
> # filewatcher.py
> from twisted.application import internet
> def watch(fp):
>         fp.seek(fp.tell())
>         for line in fp.readlines():
>                 sys.stdout.write(line)
> import sys
> from twisted.internet import reactor
> s = internet.TimerService(1.0, watch, file(sys.argv[1]))
s = [internet.TimerService(1.0, watch, file(x) for x in sys.argv[1:]]
for x in s: x.startService()
> s.startService()
> reactor.run()
> s.stopService()
> [/code]
> I find this piece of code amazing and I am keen to put it to use.
> If I run './filewatcher.py myfile' it will print out any changes made to 
> 'myfile', very similar to 'tail -f' .
> Now if I want to have this program monitor several files at once I could 
> run './filewatcher.py file1 file2 filex' or './filewatcher.py file1 & 
> ./filewatcher file2 & etc' both with minor modifications to the code,  
Well, compared to threads, executing a stat and/or read (I guess it goes
the read way, which is interesting, usually one watches files by doing
stat) is not relevant.
> but I think that could cause performance problems relating to the OS.
> So I'm thinking I will need to learn python threads (no bad thing) 
How would adding Threads to the mix solve any performance problems *g*

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