Test

test.py

 from distutils.core import setup
+from distutils.extension import Extension
 from Cython.Build import cythonize
 
+ext_modules = [
+    Extension(
+        'test',
+        ['test.pyx'],
+        extra_compile_args=['-fopenmp'],
+        extra_link_args=['-fopenmp'],
+    )
+]
+
 setup(
-    ext_modules = cythonize("test.pyx")
+    ext_modules = cythonize(ext_modules)
 )

test.pyx

 #cython: language_level = 3
+from cython.parallel import parallel
 from libc.stdio cimport printf
 """
     GOAL: implement nogil option in cdef class (extension types)
@@ -53,8 +54,8 @@ cdef class SomeMemory nogil:
     It is possible to define native C/Cython methods
     that release the GIL (cool...)
     """
-    pass
-    # self.a = self.b
+    while 1:
+      self.a += 1
     
   # Not allowed to define pure Python function in the extension type with nogil option now
   # since we want this extension type is CPython free
@@ -76,6 +77,7 @@ cdef double bar() nogil: # yet this is what we would like to
     # cdef SomeMemory o = SomeMemory(42.0, 3.14) # for this we need class allocation to handle memory without libpython
     cdef SomeMemory o1 = SomeMemory(1, 1.0)
     cdef SomeMemory o2 = SomeMemory(2, 2.0)
+    with nogil, parallel():
       o1.foo()
       o2.foo()
     # o.foo() # and we need method selection to be independent of libpython