diff -r 39e5f73667ba -r c2ef9095503a hostsupport/hostopengles11/src/glesOS.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hostsupport/hostopengles11/src/glesOS.cpp	Wed Oct 06 17:59:01 2010 +0100
@@ -0,0 +1,97 @@
+/* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and /or associated documentation files
+ * (the "Materials "), to deal in the Materials without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Materials,
+ * and to permit persons to whom the Materials are furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Materials.
+ *
+ * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR
+ * THE USE OR OTHER DEALINGS IN THE MATERIALS.
+ *
+ * Initial Contributors:
+ * Nokia Corporation - initial contribution.
+ *
+ * Contributors:
+ *
+ * Description:
+ *
+ */
+
+#include "glesOS.h"
+#include "glesInternal.h"
+
+namespace
+{
+static bool g_lockInitialized = false;
+static GLES_LOCK g_lock;
+}
+
+#if defined(_WIN32)
+static void initializeLock()
+{
+    GLES_ASSERT(!g_lockInitialized);
+    InitializeCriticalSection(&g_lock);
+    g_lockInitialized = true;
+}
+
+void glesGetLock()
+{
+    if(!g_lockInitialized)
+    {
+        initializeLock();
+    }
+    EnterCriticalSection(&g_lock);
+}
+
+void glesReleaseLock()
+{
+    GLES_ASSERT(g_lockInitialized);
+    LeaveCriticalSection(&g_lock);
+}
+#else // defined(_WIN32)
+static void initializeLock()
+{
+    int ret;
+
+    GLES_ASSERT(!g_lockInitialized);
+
+    pthread_mutexattr_t attr;
+    ret = pthread_mutexattr_init(&attr);	//initially not locked
+    GLES_ASSERT(!ret);	//check that there aren't any errors
+    ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);	//count the number of recursive locks
+    GLES_ASSERT(!ret);	//check that there aren't any errors
+    ret = pthread_mutex_init(&g_lock, &attr);
+    pthread_mutexattr_destroy(&attr);
+    GLES_ASSERT(!ret);	//check that there aren't more errors
+
+    g_lockInitialized = true;
+}
+
+void glesGetLock()
+{
+    if(!g_lockInitialized)
+    {
+        initializeLock();
+    }
+    int ret = pthread_mutex_lock(&g_lock);
+    GLES_ASSERT(!ret);
+}
+
+void glesReleaseLock()
+{
+    GLES_ASSERT(g_lockInitialized);
+    int ret = pthread_mutex_unlock(&g_lock);
+    GLES_ASSERT(!ret);
+}
+#endif // !defined(_WIN32)