Re: Embedding Python. But not so easy.
1) Threads: the simulation is going to be run in a very parallel
environment with several CPUs and
http://docs.python.org/c-api/init.html#thread-state-and-
the-global-interpreter-lock there is a global lock mentioned. Does that
mean that the python code can not benefit from this ?
Not if it is CPU-bound, no. To overcome that, you'd either need multiple
processes, or you could try trick the python interpreter by using renamed
DLLs, which means that you can start several interpreters in one process.
*BUT* that's a nasty hack you can't share objects between the
interpreters.
2) The script has to hand back control to the C++ framework without
increasing the C execution stack. and be able to resume the execution at a
later point.
I try some pseudo code here to explain
// C++:
ctx = new ExecutionContext();
ctx-run();
while(ctx-stillRunning()) {
otherStuff();
ctx-resume();
}
Stackless python might be of help here, google it.
Diez
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Embedding Python. But not so easy.
Hi,
Right now I am in a project writing a Simulation engine, and we are right now
in the process of evaluating a script engine.
The basic principle is a C++ engine simulating the environment and scriptable
agents interacting with the environment.
But the current design has a special requirement to that scriptability and my
current knowledge of the API of Python isolated two problems
1) Threads: the simulation is going to be run in a very parallel environment
with several CPUs and http://docs.python.org/c-api/init.html#thread-state-and-
the-global-interpreter-lock there is a global lock mentioned. Does that mean
that the python code can not benefit from this ?
2) The script has to hand back control to the C++ framework without increasing
the C execution stack. and be able to resume the execution at a later point.
I try some pseudo code here to explain
// C++:
ctx = new ExecutionContext();
ctx-run();
while(ctx-stillRunning()) {
otherStuff();
ctx-resume();
}
..
// Python
y=21
...
..
# Here the execution is suspended und control handed back to the C++ code
suspend
y+=12
end
I hope that makes it clear. I did not see a way to implement this with the
python interpreter.
I am hoping to be proven wrong
Thanks in advance
Greets
Peter
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