add gil technqiue for windows to simulate forking

Author: Vizonex

uvloop/handles/process.pyx

@@ -91,27 +91,33 @@ cdef class UVProcess(UVHandle):
             self._restore_signals = restore_signals
 
             loop.active_process_handler = self
-            __forking = 1
-            __forking_loop = loop
+            
 
             if not system.PLATFORM_IS_WINDOWS:
+                __forking = 1
+                __forking_loop = loop
                 system.setForkHandler(<system.OnForkHandler>&__get_fork_handler)
 
                 PyOS_BeforeFork()
+            else:
+                py_gil_state = PyGILState_Ensure()
 
             err = uv.uv_spawn(loop.uvloop,
                           <uv.uv_process_t*>self._handle,
                           &self.options)
 
-            __forking = 0
-            __forking_loop = None
+            
             if not system.PLATFORM_IS_WINDOWS:
-                
+                __forking = 0
+                __forking_loop = None
                 system.resetForkHandler()
 
                 PyOS_AfterFork_Parent()
+            else:
+                PyGILState_Release(py_gil_state)
 
-            
+            loop.active_process_handler = None
+
 
             if err < 0:
                 self._close_process_handle()

uvloop/loop.pyx

@@ -28,6 +28,10 @@ from libc.stdint cimport uint64_t
 from libc.string cimport memset, strerror, memcpy
 from libc cimport errno
 
+# Winloop Comment: We need some cleaver hacky techniques for 
+# preventing slow spawnning processes for MSVC
+from cpython.pystate cimport (PyGILState_Ensure, PyGILState_Release,
+                              PyGILState_STATE)
 from cpython cimport PyObject
 from cpython cimport PyErr_CheckSignals, PyErr_Occurred
 from cpython cimport PyThread_get_thread_ident