Allocate memory pages
lazarus / 66-Unix

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LemonParty · 2025-02-27 14:46

In Windows we have VirtualAlloc function for allocate memory pages.
What is used in UNIX?

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H₂SO₄ · 2025-02-27 14:50

mmap,  and  mprotect  is analogous to  VirtualProtect

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LemonParty · 2025-02-27 15:14

So if I want just memory I have to pass 0 to fd and offset arguments
of mmap?

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MarkMLl · 2025-02-27 16:04

Quote from: LemonParty on February 27, 2025, 04:14:43 pmSo if I want
just memory I have to pass 0 to fd and offset arguments of mmap?

There's an example at https://www.freepascal.org/docs-
html/current/rtl/baseunix/fpmmap.html which suggests that it's not
that simple. I've not used it ** , and suggest that you look for
online examples- even if (shock! Horror!!) they're written in C etc.

** I've not used it in Pascal. I've used it in some C-based video
stuff, but was doing so by rote based on existing code and there is
absolutely no way I'd set myself up as an expert. I believe it's
covered by POSIX, so examples should be fairly portable.

MarkMLl

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LemonParty · 2025-02-27 16:52

Seems work.
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i Fpmmap(nil,
Size, PROT_EXEC or PROT_READ or PROT_WRITE, MAP_SHARED or
MAP_ANONYMOUS, -1, 0)MAP_ANONYMOUS should be specified if no need to
map to a file.