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Re: Solaris problem rallocing arrays


From: Manuel Guesdon
Subject: Re: Solaris problem rallocing arrays
Date: Tue, 20 Mar 2001 19:13:33 +0100 (CET)

On Tue, 20 Mar 2001 10:13:46 -0700 Adam Fedor <Adam Fedor <address@hidden>> 
wrote:

 >| I'm getting the oddest behaviour on Solaris (2.6) machines in
 >| NSProcessInfo(_gnu_process_args). The code is essentially
 >| 
 >|     NSMutableArray  *keys = [NSMutableArray new];
 >| 
 >|     for {each environment variable...}
 >|        [keys addObject: [NSString stringWithCString: {some C string}]];
 >| 
 >| The default initializer creates an array with capacity 1, so there is a
 >| lot of realloc'ing the array early on. On the third realloc
 >| (capacity==4), the actual CONTENTS of the first three values of the
 >| array change! As if,
 >| 
 >| a[0] = 1; a[1] = 2; a[2] = 3; a[3] = 4
 >| 
 >| becomes
 >| 
 >| a[0] = 45345; a[1] = 0; a[2] = 0; a[3] = 4;
 >| 
 >| simply due to a realloc of a (in fact a[0] takes on the value of &a[4]).
 >| Does anyone have any ideas what would cause this? Solaris has
 >| problems with word alignment, but I don't see that happening here.
 >| Just changing  the initialization to 

Are you sure that the returned pointer is used as the new array pointer ?
I've found such a bug in libxml.

"realloc() returns a pointer to the newly allocated memory,
which is suitably aligned for any kind of variable and may
be different from ptr"

BTW, where is defined GC_REALLOC ?

Manuel
--
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Manuel Guesdon - OXYMIUM <address@hidden>
14 rue Jean-Baptiste Clement  -  93200 Saint-Denis  -  France
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