remove always true if-predicate (gcc-5 -Wlogical-op)

[folly.git] / folly / Executor.h

diff --git a/folly/Executor.h b/folly/Executor.h
index 5ba4844b5f1c4843b9117b60330b96c4624e696a..258100cd7ab8c286ae0a2480715ee034b45dda01 100644 (file)
--- a/folly/Executor.h
+++ b/folly/Executor.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,11 +16,13 @@
 
 #pragma once
 
-#include <functional>
+#include <climits>
+
+#include <folly/Function.h>
 
 namespace folly {
 
-typedef std::function<void()> Func;
+using Func = Function<void()>;
 
 /// An Executor accepts units of work with add(), which should be
 /// threadsafe.
@@ -32,6 +34,18 @@ class Executor {
   /// variants must be threadsafe.
   virtual void add(Func) = 0;
 
+  /// Enqueue a function with a given priority, where 0 is the medium priority
+  /// This is up to the implementation to enforce
+  virtual void addWithPriority(Func, int8_t priority);
+
+  virtual uint8_t getNumPriorities() const {
+    return 1;
+  }
+
+  static const int8_t LO_PRI  = SCHAR_MIN;
+  static const int8_t MID_PRI = 0;
+  static const int8_t HI_PRI  = SCHAR_MAX;
+
   /// A convenience function for shared_ptr to legacy functors.
   ///
   /// Sometimes you have a functor that is move-only, and therefore can't be