[C++-sig] Patch to add thread support to invoke function.

[Lijun Qin]

Hi,

I have made some changes to the invoke.hpp file, to add

Py_UNBLOCK_THREADS
 result = f(...);
Py_BLOCK_THREADS

pair, this is need for too reasons:
First, if the f(...) is a lengthy operation, it'll block all Python code to
execute, this is not good,
second, if f(...) function call some functions that will acquire the python
global lock, it'll deadlock, one example is the COM inproc server using
Pythoncom22.dll, every COM interface method will first call
PyEval_AcquireThread, but the global lock has been held, so deadlock occur.

Lijun Qin
http://www.solidshare.com



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