Thread: [cgkit-commits] SF.net SVN: cgkit: [45] maya/trunk/maya_wrapper/src_aux/aux_threading.h

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Revision: 45
          http://svn.sourceforge.net/cgkit/?rev=45&view=rev
Author:   mbaas
Date:     2006-09-22 09:49:36 -0700 (Fri, 22 Sep 2006)

Log Message:
-----------
Added support code for acquiring/releasing the Python GIL.

Added Paths:
-----------
    maya/trunk/maya_wrapper/src_aux/aux_threading.h

Added: maya/trunk/maya_wrapper/src_aux/aux_threading.h
===================================================================

--- maya/trunk/maya_wrapper/src_aux/aux_threading.h	                        (rev 0)
+++ maya/trunk/maya_wrapper/src_aux/aux_threading.h	2006-09-22 16:49:36 UTC (rev 45)
@@ -0,0 +1,107 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Python Computer Graphics Kit.
+ *
+ * The Initial Developer of the Original Code is Matthias Baas.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef _THREADING_H
+#define _THREADING_H
+
+/**
+  \file aux_threading.h
+  Contains code for supporting multi-threading.
+*/
+
+#include <python.h>
+
+
+/**
+  This class should be used for acquiring/releasing the Python GIL.
+
+ */
+class GILGuard
+{
+    private:
+    /// Counts how often ensure() has been called.
+    unsigned int numlocks;
+
+    PyGILState_STATE gstate;
+
+    public:
+    /** 
+      Constructor.
+    */
+    GILGuard()
+      : numlocks(0), gstate(0)
+    {
+    }
+
+    /**
+       Destructor.
+
+       Releases the GIL if it was acquired.
+     */
+    ~GILGuard() 
+    {
+      while (numlocks>0)
+	release();
+    }
+
+    /**
+       Acquire the GIL.
+
+       This method corresponds to the PyGILState_Ensure() function
+       from the Python/C API.
+       It can be called several times but must be matched by an
+       equivalent number of calls to release().
+     */
+    void ensure() 
+    {
+      if (numlocks==0)
+      {
+	gstate = PyGILState_Ensure();
+      }
+      numlocks++;
+    }
+
+    /**
+       Release the GIL.
+
+       This method corresponds to the PyGILState_Release() function
+       from the Python/C API.
+       It must be called as many times as ensure() was called.
+
+       If it is called without that ensure() has been called, the
+       method returns immediately.
+     */
+    void release() 
+    {
+      if (numlocks==0)
+	return;
+
+      numlocks--;
+      if (numlocks==0)
+      {
+	PyGILState_Release(gstate);
+      }
+    }
+    
+};
+
+#endif


Property changes on: maya/trunk/maya_wrapper/src_aux/aux_threading.h
___________________________________________________________________
Name: svn:eol-style
   + native


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.


