From: loafman AT gte DOT net (Kenneth Loafman)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Volatile
Date: 7 Aug 1997 17:13:53 GMT
Organization: Loafman Software
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On Wed, 06 Aug 1997 11:19:22 -0700, Ionicis <anfamily AT sprintmail DOT com>
wrote:

>Korenschi Francisc Eduard wrote:
>> 
>> Hi,
>> 
>>   I know it sounds crazy, but what does the 'voltaile' with a
>> variable/function ?
>> 
>>    Thanx for bothering,
>>   Eduard
>The volatile keyword makes a variable not "changable" by anything except
>the code itself.  I'm pretty sure that's what it means  :)

Just the opposite.  Volatile means that the variable MAY BE changed by
something other then the code itself, i.e. by a device, by an interrupt
service routine, by another process.  What this means to the compiler is
that it should not cache this variable in a register since each reference
to it should come from the volatile memory location.

...Kenneth