Sven Barth schrieb:
Am 27.08.2010 12:27, schrieb Maik Wojcieszak:
Hi,
What exactly does this
System.IsMultiThread := true;
do ?
If I use external threads with my thread creation callback it works fine
with
System.IsMultiThread := false;
If I set it to true the app crashes when creating the first threads.
If I use the suggested initialisation with the dummy thread it works
too, but with
System.IsMultiThread := true;
Thanks in advance,
Maik
I did a quick search in the source of the RTL. IsMultiThread is mostly
tested to check whether multi threading was already initialised.
Especially on POSIX systems you MUST NOT set IsMultiThread to True or
the threadvar system won't be initialized (win32 does a more
"intelligent" test).
The interesting thing is though that IsMultiThread is never set to
True by the RTL in POSIX systems...
The creation of a dummy thread should be enough. You can set
IsMultiThread to true after the thread has run though (to circumvent
the POSIX problem I mentioned above).
My attempt to summarize all (practical) aspects is online now (at the
end of the page):
http://wiki.freepascal.org/Multithreaded_Application_Tutorial
If I should make corrections, just let me know.
Regards,
Alexander
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