SkThreadPool ~~> SkTaskGroup

src/utils/SkTaskGroup.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTaskGroup_DEFINED
+#define SkTaskGroup_DEFINED
+
+#include "SkTypes.h"
+#include "SkRunnable.h"
+
+class SkTaskGroup : SkNoncopyable {
+public:
+    // Call before creating any SkTaskGroup to set the number of threads all SkTaskGroups share.
+    // If not called, we default to the number of system-reported cores.
+    static void SetThreadCount(int);
+
+    SkTaskGroup();
+    ~SkTaskGroup() { this->wait(); }
+
+    // Add a task to this SkTaskGroup.  It will likely run() on another thread.
+    void add(SkRunnable*);
+
+    // Block until all Tasks previously add()ed to this SkTaskGroup have run().
+    // You may safely reuse this SkTaskGroup after wait() returns.
+    void wait();
+
+private:
+    /*atomic*/ int32_t fPending;
+};
+
+#endif//SkTaskGroup_DEFINED