f2py function release GIL
No, f2py defaults to leaving the GIL in place. However, you can release the GIL by adding the threadsafe directive.
example:
subroutine foo(a)!f2py threadsafe!f2py intent(out) :: ainteger aa = 5end subroutine fooNow compile it:
f2py -c -m foo --build-dir test_build foo.f90And we can check the source code:
grep THREAD test_build/src.*/*.cbuild/src.linux-x86_64-2.7/testmodule.c: Py_BEGIN_ALLOW_THREADSbuild/src.linux-x86_64-2.7/testmodule.c: Py_END_ALLOW_THREADSHowever, if we repeat the process removing the !f2py threadsafe line, then the macros to release the GIL aren't included.