[Dev-C++] RES: RES: RES: RES: Question about software design

[<and...@su...>]

I don´t know the size of your "heap-patience", people :-))

But...
   -When I do a malloc for a simple vector, can´t I
discover if its memory is shared with other lockable
stuff?
   -Does the Operating System decide by itself to do
this kind of sharing mode, or do I need to do it through
my program?

Thinking in another way...
   -This "driver or similar" belongs to my application,
doesn´t it? If it´s true, I know if my program is using
this kind of lockable memory, don´t I?

(I think it´s the last)
Thank you!!!
Andre


  -----Mensagem original-----
  De: Rafael Menezes [mailto:so...@gm...]
  Enviada em: quarta-feira, 21 de novembro de 2007 13:19
  Para: André Macário Barros
  Assunto: Re: [Dev-C++] RES: RES: RES: Question about software design


  Hi André

  Yes and No. That depends of how you have allocated that memory. Some
functions can alloc shared memory (Yes Per, that is exactly  (RAM disk) what
am I doing in that app). This ones you must free by hand or they will keep
in there until a system restart or something like (Memory clean tools... i
don't know. Maybe some vb script with a mychar(999999) inside ;).

  I think Per have just released a better text in that subject. Here comes:

  "When you run an application under Win32, the C or C++ library contains
the
  heap implementation (malloc(), calloc(), new, ...) and requests memory
  from the OS. The OS keeps track of all memory pages it gives to the
  application. It has to, since the processor is running in protected mode
  with a Memory Management Unit (MMU) to map between logical and physical
  memory addresses. Whenever the application ends, the OS can release all
  memory pages that was mapped to the application. Only if the memory page
  is shared with a driver or similar, and the driver has the page locked,
  will the OS have to keep the memory page until the lock is released."

  That answer your question (with a big YES if the next sentence doesn't fit
to your application.), and explain my app behavior.

  Regards
  Rafael


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