diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/utils/SkCondVar.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/utils/SkCondVar.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkCondVar_DEFINED
+#define SkCondVar_DEFINED
+
+#ifdef SK_USE_POSIX_THREADS
+#include <pthread.h>
+#elif defined(SK_BUILD_FOR_WIN32)
+#include <windows.h>
+#endif
+
+/**
+ * Condition variable for blocking access to shared data from other threads and
+ * controlling which threads are awake.
+ *
+ * Currently only supported on platforms with posix threads and Windows Vista and
+ * above.
+ */
+class SkCondVar {
+public:
+    SkCondVar();
+    ~SkCondVar();
+
+    /**
+     * Lock a mutex. Must be done before calling the other functions on this object.
+     */
+    void lock();
+
+    /**
+     * Unlock the mutex.
+     */
+    void unlock();
+
+    /**
+     * Pause the calling thread. Will be awoken when signal() or broadcast() is called.
+     * Must be called while lock() is held (but gives it up while waiting). Once awoken,
+     * the calling thread will hold the lock once again.
+     */
+    void wait();
+
+    /**
+     * Wake one thread waiting on this condition. Must be called while lock()
+     * is held.
+     */
+    void signal();
+
+    /**
+     * Wake all threads waiting on this condition. Must be called while lock()
+     * is held.
+     */
+    void broadcast();
+
+private:
+#ifdef SK_USE_POSIX_THREADS
+    pthread_mutex_t  fMutex;
+    pthread_cond_t   fCond;
+#elif defined(SK_BUILD_FOR_WIN32)
+    CRITICAL_SECTION   fCriticalSection;
+    CONDITION_VARIABLE fCondition;
+#endif
+};
+
+#endif