text: /*
   * Copyright 2017 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef SkExecutor_DEFINED
  #define SkExecutor_DEFINED
  
  #include <functional>
  #include <memory>
  #include "include/core/SkTypes.h"
  
  class SK_API SkExecutor {
  public:
      virtual ~SkExecutor();
  
      // Create a thread pool SkExecutor with a fixed thread count, by default the number of cores.
      static std::unique_ptr<SkExecutor> MakeFIFOThreadPool(int threads = 0);
      static std::unique_ptr<SkExecutor> MakeLIFOThreadPool(int threads = 0);
  
      // There is always a default SkExecutor available by calling SkExecutor::GetDefault().
      static SkExecutor& GetDefault();
      static void SetDefault(SkExecutor*);  // Does not take ownership.  Not thread safe.
  
      // Add work to execute.
      virtual void add(std::function<void(void)>) = 0;
  
      // If it makes sense for this executor, use this thread to execute work for a little while.
      virtual void borrow() {}
  };
  
  #endif//SkExecutor_DEFINED
  