auto import from //depot/cupcake/@135843
diff --git a/include/cutils/threads.h b/include/cutils/threads.h
new file mode 100644
index 0000000..acf8f48
--- /dev/null
+++ b/include/cutils/threads.h
@@ -0,0 +1,146 @@
+/*
+ * 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_CUTILS_THREADS_H
+#define _LIBS_CUTILS_THREADS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/***********************************************************************/
+/***********************************************************************/
+/***** *****/
+/***** local thread storage *****/
+/***** *****/
+/***********************************************************************/
+/***********************************************************************/
+
+#ifdef HAVE_PTHREADS
+
+#include <pthread.h>
+
+typedef struct {
+ pthread_mutex_t lock;
+ int has_tls;
+ pthread_key_t tls;
+
+} thread_store_t;
+
+#define THREAD_STORE_INITIALIZER { PTHREAD_MUTEX_INITIALIZER, 0, 0 }
+
+#elif defined HAVE_WIN32_THREADS
+
+#include <windows.h>
+
+typedef struct {
+ int lock_init;
+ int has_tls;
+ DWORD tls;
+ CRITICAL_SECTION lock;
+
+} thread_store_t;
+
+#define THREAD_STORE_INITIALIZER { 0, 0, 0, {0, 0, 0, 0, 0, 0} }
+
+#else
+# error "no thread_store_t implementation for your platform !!"
+#endif
+
+typedef void (*thread_store_destruct_t)(void* value);
+
+extern void* thread_store_get(thread_store_t* store);
+
+extern void thread_store_set(thread_store_t* store,
+ void* value,
+ thread_store_destruct_t destroy);
+
+/***********************************************************************/
+/***********************************************************************/
+/***** *****/
+/***** mutexes *****/
+/***** *****/
+/***********************************************************************/
+/***********************************************************************/
+
+#ifdef HAVE_PTHREADS
+
+typedef pthread_mutex_t mutex_t;
+
+#define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
+
+static __inline__ void mutex_lock(mutex_t* lock)
+{
+ pthread_mutex_lock(lock);
+}
+static __inline__ void mutex_unlock(mutex_t* lock)
+{
+ pthread_mutex_unlock(lock);
+}
+static __inline__ int mutex_init(mutex_t* lock)
+{
+ return pthread_mutex_init(lock, NULL);
+}
+static __inline__ void mutex_destroy(mutex_t* lock)
+{
+ pthread_mutex_destroy(lock);
+}
+#endif
+
+#ifdef HAVE_WIN32_THREADS
+typedef struct {
+ int init;
+ CRITICAL_SECTION lock[1];
+} mutex_t;
+
+#define MUTEX_INITIALIZER { 0, {{ NULL, 0, 0, NULL, NULL, 0 }} }
+
+static __inline__ void mutex_lock(mutex_t* lock)
+{
+ if (!lock->init) {
+ lock->init = 1;
+ InitializeCriticalSection( lock->lock );
+ lock->init = 2;
+ } else while (lock->init != 2)
+ Sleep(10);
+
+ EnterCriticalSection(lock->lock);
+}
+
+static __inline__ void mutex_unlock(mutex_t* lock)
+{
+ LeaveCriticalSection(lock->lock);
+}
+static __inline__ int mutex_init(mutex_t* lock)
+{
+ InitializeCriticalSection(lock->lock);
+ lock->init = 2;
+ return 0;
+}
+static __inline__ void mutex_destroy(mutex_t* lock)
+{
+ if (lock->init) {
+ lock->init = 0;
+ DeleteCriticalSection(lock->lock);
+ }
+}
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LIBS_CUTILS_THREADS_H */