On 24 Dec 2008, at 00:02, Andrew Brunner wrote:
Following Setup:
Ubuntu 8.10 x64
FPC 2.2.3 (latest and greatest)
Lazarus (Latest and greatest)
I'm seeing an anomaly with reading/writing to an Array[THandle] of
Pointers.
TMyStruct=record
Index:integer;
end;
PMyStruct=^TMyStruct;
TMyList = Array[THandle] of PMyStruct;
If I declare a localized variable
procedure Test();
var
MyTest:TMyList;
hThread:THandle;
begin
hThread:=getCurrentThreadID;
if (MyTest[hThread])=nil then begin // <---- CRASH HERE EXTERNAL
SIGBUS
end;
end;
thandle is a longint on fpc/linux, so you're declaring an array of
2^32 * 8 bytes (32GB) on the stack here. That may be valid on linux/
x86_64, but it also may not be (I don't know what Linux' stack limits
are). It's definitely not something that would seem advisable to me.
I'm surprised this is supposed work with Delphi since thandle is a
dword for Windows, so you're still ending up with an array of 2^32 * 4
bytes (16 GB) on Win32. There's simply no way to map that much memory
at once in 32 bit process' address space.
Jonas
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