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threads on osr5

From: jlselsewhere@my-deja.com (J. L. Schilling)
Subject: Re: Threads on SCO OpenServer 3.2 5.0.5
Date: 20 Mar 2002 18:46:29 -0800
References: <3c8dc9ff$0$24014$4d4eb98e@read.news.fr.uu.net>
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<3c8e1470$0$24007$4d4eb98e@read.news.fr.uu.net>
<ff3c0649.0203121510.2bf3eb4@posting.google.com>
<1016617892.510054@newsreader1.wirehub.nl>
<20020320020820.M22877@mammoth.ca.sco.com>
<1016622093.118511@newsreader1.wirehub.nl> 

"Frank" <frank.kaayk@already_got_spammed_before_ordina.nl> wrote in message news:<1016622093.118511@newsreader1.wirehub.nl>...
>
> The threads (for test purpose) are put to sleep for ten seconds each.
> Therefor ten threads on the SCO will take over 100 seconds.
> On the Linux machine the whole process takes over 10 seconds (the threads
> are actually 'threading')

I forgot to respond to this part.

In real threads libraries, the sleep() system call and the threads library
cooperate, such that each thread is allowed to sleep independently of
the others.  [See for example the sleep(2) man page on Open UNIX 8.]

I suspect what is happening to you is that whatever third-party threads
library you on using on OpenServer doesn't do this, and consequently
each thread does a 10-second wait that holds up the whole process and
hence all the other threads, adding up to 100 seconds of sleep.  

This is one of the basic disadvantage of third-party user-space 
threads libraries:  they don't interact well with OS facilities.

Jonathan Schilling
 

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