José Mejuto schrieb:
Hello Lazarus-List,
Wednesday, August 25, 2010, 8:44:53 AM, you wrote:
MW> I've packed the runtime env dlls and put them on my ftp server.
MW> They are too big to attach to the mail on the list.
Do you have compiled the "vcmtdll.dll" with Multithread runtime
library (/MT) ?
To avoid crashes just simply:
// start threads
for index := 0 to FThreads.Count-1 do
begin
TVCMTThread(FThreads.Items[index]).Start(10);
Sleep(50);
end;
Adding the Sleep(50) avoids any crash, and the AsyncWrite works as
expected. You should also add a Sleep(50) after each FThreads[n].free
If a multithread problem is solved with sleeps usually it is a race
condition in the RTL, in this case you create a new thread while the
provious one is being created (or destroyed), so to me looks like a
VC++ non multithread RTL problem.
It is also desirable to add the line "IsMultithread:=true" in the
first line of .lpr (after the begin) to activate the Multithread RTL
in the FPC, otherwise it could not be active.
I had tested it with 200 threads and using the sleeps no problem at
all.
Hello José,
I have tried to reduce the DLL problem into a test that doesn't need any
external DLL. It crashes too.
Here's the test program:
http://grauonline.de/alexwww/tmp/extthread.zip
Can you see any analogy to the problem? I have tried to add your
suggested "IsMultithread:=true" and it doesn't make any difference. I
think there's something wrong in the FPC runtime.
Regards,
Alexander
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