Le 17/01/2014 12:53, Michael Van Canneyt a écrit :
On Fri, 17 Jan 2014, Antonio Fortuny wrote:
Hi All.
Maybe not a Lazarus/FPC specific question but development whill be
done using Lazarus/FPC.
I wonder if I can build an application (service) having multiple
threads running (Indy TCP/IP server, multiple connections) and every
thread calls some functions in a library (dll on Windows, .so on Linux)
I can imagine that if every thread loads dynamically the library it
should work as I assume that a library shares its code among all
callers (processes ?) but each instance has its own data segment tied
tp the calling process (thread ?).
The data segment is tied to the process, not to the thread.
So global variables in the DLL are shared by all threads of the
calling process.
If you define threadvars in the DLL, they will normally be specific to
threads of the calling program (just as they would be if the library
created the thread).
Ok, got it. The library has to be made thread safe as well. This was
already in my mind.
Tnaks Michael.
Antonio.
Michael.
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