[Lazarus] Threads and Libraries (dll and so)
a.fortuny at sitasoftware.lu
Fri Jan 17 13:16:56 CET 2014
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.
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