If are you dynamically creating and destroying threads in your app be
careful. Delphi 4 has got the same bug as all other versions in the thread
management. They all require a critical section at the indicated points.
I have also found that with using data databases that if you create a new
session for a thread this session must be created in the main thread (i.e.
use syncronize).
I am still working through DDE issues in threads as there appears to be some
problems in this area as well.
Maurice
procedure AddThread;
function AllocateWindow: HWND;
var
TempClass: TWndClass;
ClassRegistered: Boolean;
begin
.
.
end;
begin
<--begin critial section
required here
if ThreadCount = 0 then
ThreadWindow := AllocateWindow;
Inc(ThreadCount);
<--end critial section
required here
end;
procedure RemoveThread;
begin
<--begin critial section
required here
Dec(ThreadCount);
if ThreadCount = 0 then
PostMessage(ThreadWindow, CM_DESTROYWINDOW, 0, 0);
<--end critial section
required here
end;
-----Original Message-----
From: Xander van der Merwe [mailto:[EMAIL PROTECTED]]
Sent: Monday, 3 May 1999 21:06
To: Multiple recipients of list delphi
Subject: Re: [DUG]: VCL COM Subsytem Thread Safety.
I've just recently read somewhere reliable that the COM/ActiveX VCL library
in Delphi 4 is now thread safe - obviously implying that it was not the case
under Delphi 3. I can't unfortunately remember the source though :-(
Xander van der Merwe
-----Original Message-----
From: Myles Penlington <[EMAIL PROTECTED]>
To: Multiple recipients of list delphi <[EMAIL PROTECTED]>
Date: Monday, May 03, 1999 9:04 AM
Subject: [DUG]: VCL COM Subsytem Thread Safety.
Does anybody know if the VCL COM Subsystem is thread safe?? OR if the Delphi
Exception handling is threadsafe (or not)?
Why ask?
If I create COM controls marked as "Both" or even "Free" will the standard
VCL COM stuff handle the multiple threads?
FYI: I found that to have IIS/ASP work with a OLE/COM Object and store the
object reference in the ASP application object, that I had to aggregate the
COM Free Threaded Marshaler object.
Regards
Myles Penlington
Software Engineer
ADVANCED MANAGEMENT SYSTEMS
---------------------------------------------------------------------------
New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED]
Website: http://www.delphi.org.nz
---------------------------------------------------------------------------
New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED]
Website: http://www.delphi.org.nz
---------------------------------------------------------------------------
New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED]
Website: http://www.delphi.org.nz
