diff --git a/include/utils/ThreadDefs.h b/include/utils/ThreadDefs.h
new file mode 100644
index 0000000..3e56373
--- /dev/null
+++ b/include/utils/ThreadDefs.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _LIBS_UTILS_THREAD_DEFS_H
+#define _LIBS_UTILS_THREAD_DEFS_H
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <system/graphics.h>
+
+// ---------------------------------------------------------------------------
+// C API
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void* android_thread_id_t;
+
+typedef int (*android_thread_func_t)(void*);
+
+enum {
+    /*
+     * ***********************************************
+     * ** Keep in sync with android.os.Process.java **
+     * ***********************************************
+     * 
+     * This maps directly to the "nice" priorities we use in Android.
+     * A thread priority should be chosen inverse-proportionally to
+     * the amount of work the thread is expected to do. The more work
+     * a thread will do, the less favorable priority it should get so that 
+     * it doesn't starve the system. Threads not behaving properly might
+     * be "punished" by the kernel.
+     * Use the levels below when appropriate. Intermediate values are
+     * acceptable, preferably use the {MORE|LESS}_FAVORABLE constants below.
+     */
+    ANDROID_PRIORITY_LOWEST         =  19,
+
+    /* use for background tasks */
+    ANDROID_PRIORITY_BACKGROUND     =  10,
+    
+    /* most threads run at normal priority */
+    ANDROID_PRIORITY_NORMAL         =   0,
+    
+    /* threads currently running a UI that the user is interacting with */
+    ANDROID_PRIORITY_FOREGROUND     =  -2,
+
+    /* the main UI thread has a slightly more favorable priority */
+    ANDROID_PRIORITY_DISPLAY        =  -4,
+    
+    /* ui service treads might want to run at a urgent display (uncommon) */
+    ANDROID_PRIORITY_URGENT_DISPLAY =  HAL_PRIORITY_URGENT_DISPLAY,
+    
+    /* all normal audio threads */
+    ANDROID_PRIORITY_AUDIO          = -16,
+    
+    /* service audio threads (uncommon) */
+    ANDROID_PRIORITY_URGENT_AUDIO   = -19,
+
+    /* should never be used in practice. regular process might not 
+     * be allowed to use this level */
+    ANDROID_PRIORITY_HIGHEST        = -20,
+
+    ANDROID_PRIORITY_DEFAULT        = ANDROID_PRIORITY_NORMAL,
+    ANDROID_PRIORITY_MORE_FAVORABLE = -1,
+    ANDROID_PRIORITY_LESS_FAVORABLE = +1,
+};
+
+enum {
+    ANDROID_TGROUP_DEFAULT          = 0,
+    ANDROID_TGROUP_BG_NONINTERACT   = 1,
+    ANDROID_TGROUP_FG_BOOST         = 2,
+    ANDROID_TGROUP_MAX              = ANDROID_TGROUP_FG_BOOST,
+};
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+// ---------------------------------------------------------------------------
+// C++ API
+#ifdef __cplusplus
+namespace android {
+// ---------------------------------------------------------------------------
+
+typedef android_thread_id_t thread_id_t;
+typedef android_thread_func_t thread_func_t;
+
+enum {
+    PRIORITY_LOWEST         = ANDROID_PRIORITY_LOWEST,
+    PRIORITY_BACKGROUND     = ANDROID_PRIORITY_BACKGROUND,
+    PRIORITY_NORMAL         = ANDROID_PRIORITY_NORMAL,
+    PRIORITY_FOREGROUND     = ANDROID_PRIORITY_FOREGROUND,
+    PRIORITY_DISPLAY        = ANDROID_PRIORITY_DISPLAY,
+    PRIORITY_URGENT_DISPLAY = ANDROID_PRIORITY_URGENT_DISPLAY,
+    PRIORITY_AUDIO          = ANDROID_PRIORITY_AUDIO,
+    PRIORITY_URGENT_AUDIO   = ANDROID_PRIORITY_URGENT_AUDIO,
+    PRIORITY_HIGHEST        = ANDROID_PRIORITY_HIGHEST,
+    PRIORITY_DEFAULT        = ANDROID_PRIORITY_DEFAULT,
+    PRIORITY_MORE_FAVORABLE = ANDROID_PRIORITY_MORE_FAVORABLE,
+    PRIORITY_LESS_FAVORABLE = ANDROID_PRIORITY_LESS_FAVORABLE,
+};
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+#endif  // __cplusplus
+// ---------------------------------------------------------------------------
+
+
+#endif // _LIBS_UTILS_THREAD_DEFS_H