Author: martin fierz
Date: 13:26:42 12/05/03
Go up one level in this thread
On December 05, 2003 at 15:10:08, Heiner Marxen wrote: >On December 05, 2003 at 13:49:31, F. Huber wrote: > >>On December 05, 2003 at 13:05:57, martin fierz wrote: >> >>>hi franz, >>> >>>i believe this might all be consistent: windows has different mem alloc >>>functions, and the compiler translates "malloc" into one of them. so if the >>>borland compiler translates it into "virtualalloc" while the MS compiler >>>translates it into "heapalloc", you get exactly the kind of behavior you >>>observed. > >Yes, that is what it looks like. > >>>if portability is not an issue, then you should use the windows functions. my >>>book says you should use virtualalloc for large chunks of memory, and heapalloc >>>for small chunks. heapalloc is supposed to be much slower when handling large >>>amounts of memory. >>> >>>virtualalloc is quite easy to use, just do >>> >>>pointer = VirtualAlloc(0, number_of_bytes, MEM_RESERVE|MEM_COMMIT, >>>PAGE_READWRITE); >>>to allocate memory, and > >Does this funtion initialize the memory, like calloc() does, >or does it leave it uninitialized, like malloc() does? the memory is initialized to zero. you have further possibilities in the virtualalloc call that i didn't go into; the things i posted are just replacements for malloc() and free(). >>>VirtualFree(pointer, 0, MEM_RELEASE); >>>to free it again. > >Also, I suspect, that something must be #include'd to get the manifests >above (MEM_...). What does your docu say? you are right of course, you must include <windows.h> - sorry, i forgot that, been programming windows for too long and bill is controlling my mind :-) cheers martin > >>>cheers >>> martin >> >>Hi again, >> >>that looks really simple - thanks for saving me a lot of time. :) >> >>I´ll try this, but since I´m not ´really´ a C-programmer (_my_ language >>is Borland Delphi), and since I´m manipulating the source code of Heiner >>Marxen, I must be _very_ carefully to not do any ´blunder´. >> >>Regards, >>Franz. > >Franz, you can send me your modified code (snippet) per email, >and I'll check it, based on the above description. > >Cheers, >Heiner
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