added hello world in c++ called from python and the same with OpenMP for multithreading - avoiding the Global Interpreter Lock through use of C++

Author: Ash Setter

HelloWorld/helloworld.pyx

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+cdef extern from "helloworldC.cpp":
+    void Helloworld() # cpdef instructs cython to automatically wrap the C function with a python function
+
+def C_Helloworld():
+    Helloworld()
+
+#c_helloworld()

HelloWorld/helloworldC.cpp

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+#include <iostream>
+
+void Helloworld(){
+  std::cout << "Hello world!" << "\n";
+}

HelloWorld/makefile

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+all:
+	python setup.py build_ext --inplace

HelloWorld/minimalRunScript.py

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+import helloworld
+
+helloworld.C_Helloworld()

HelloWorld/setup.py

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+from distutils.core import setup
+from distutils.extension import Extension
+from Cython.Build import cythonize
+
+ext = Extension('helloworld', sources=["helloworld.pyx"], language="c++")
+
+setup(name="helloworld", ext_modules = cythonize([ext]))

HelloWorldOpenMP/helloworld.pyx

@@ -0,0 +1,7 @@
+cdef extern from "helloworldC.cpp":
+    void Helloworld() # cpdef instructs cython to automatically wrap the C function with a python function
+
+def C_Helloworld():
+    Helloworld()
+
+#c_helloworld()

HelloWorldOpenMP/helloworldC.cpp

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+#include <iostream>
+#include <omp.h>
+
+void Helloworld(){
+#pragma omp parallel
+  {
+    int Thread_Num = omp_get_thread_num();
+#pragma omp critical
+    std::cout << "Hello world! from Thread " << Thread_Num << "\n";
+  }
+}

HelloWorldOpenMP/makefile

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+all:
+	python setup.py build_ext --inplace

HelloWorldOpenMP/setup.py

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+from distutils.core import setup
+from distutils.extension import Extension
+from Cython.Build import cythonize
+
+ext = Extension('helloworld', sources=["helloworld.pyx"], language="c++", extra_compile_args=['-fopenmp'], extra_link_args=['-lgomp'])
+
+setup(name="helloworld", ext_modules = cythonize([ext]))