• Subject: Re: Terminating a C program
  • From: rjd@xxxxxxxxxx
  • Date: Wed, 9 Aug 2000 21:37:44 -0500

On 08/09/2000 at 05:48:16 PM, "Simon Coulter" <shc@flybynight.com.au>
wrote:

     >3.  I looked up the ILE C Programmers Guide(appendixH) where it
>states.....keeping an activation group active after the program has exited
>means that all the storage associated with that program is still allocated
>and in a 'last-used' state. When the program is called again,
>initialization, as defined by the language, is not done. All variables
have
>the last value assigned to them in the previous run of he program. In
>addition all of the settings in the ILE C run-time are in 'last-used'
state
>such as signal(),strtok() etc......." .(reference H1.1).

Interesting, I would expect automatic storage to be reinitialised
regardless of
activation group persistence.


Simon, given all of the great information that you share with the mailing
list, I was surprised by your last statement (above).  Perhaps I
misunderstood.

The information cited from the Programmer's Guide applies only to static
data.  For C and C++, initialization of automatic storage is not defined by
the language, and, independent of the activation group, automatic storage
is never initialized (by the compiler or machine) for these languages.  It
would be very wrong, for example, to assume that automatic variables are
initialized to zero.

Bob Donovan
IBM Rochester


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