1 /*
2  * Copyright 2017 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef SkExecutor_DEFINED
9 #define SkExecutor_DEFINED
10 
11 #include <functional>
12 #include <memory>
13 
14 class SkExecutor {
15 public:
16     virtual ~SkExecutor();
17 
18     // Create a thread pool SkExecutor with a fixed thread count, by default the number of cores.
19     static std::unique_ptr<SkExecutor> MakeThreadPool(int threads = 0);
20 
21     // There is always a default SkExecutor available by calling SkExecutor::GetDefault().
22     static SkExecutor& GetDefault();
23     static void SetDefault(SkExecutor*);  // Does not take ownership.  Not thread safe.
24 
25     // Add work to execute.
26     virtual void add(std::function<void(void)>) = 0;
27 
28     // If it makes sense for this executor, use this thread to execute work for a little while.
borrow()29     virtual void borrow() {}
30 };
31 
32 #endif//SkExecutor_DEFINED
33