Make number of available threads isolate-dependent and expose it to ResourceConstraints.

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3804 matching lines @@
 
   int max_young_space_size() const { return max_young_space_size_; }
   void set_max_young_space_size(int value) { max_young_space_size_ = value; }
   int max_old_space_size() const { return max_old_space_size_; }
   void set_max_old_space_size(int value) { max_old_space_size_ = value; }
   int max_executable_size() { return max_executable_size_; }
   void set_max_executable_size(int value) { max_executable_size_ = value; }
   uint32_t* stack_limit() const { return stack_limit_; }
   // Sets an address beyond which the VM's stack may not grow.
   void set_stack_limit(uint32_t* value) { stack_limit_ = value; }
+  int max_available_threads() { return max_available_threads_; }

[Sven Panne, 2013/11/18 14:40:07]

const

Furthermore, the semantics and the typing are slightly confusing: What the
getter returns is actually a Maybe<int>, but even then it is not clear what e.g.
1 means: Does it mean no concurrency at all or 1 additional thread apart from
the main JavaScript thread? I guess it's the former, but this is a bit unclear.
Either add a comment or choose a better name.

The "Maybe" part holds for all the other fields of this POD, too, but it's
already baked into our current API. :-( I propose to leave everything as it is
and get the typing right when the constraints become part of the Isolate's
constructor arguments.

+  void set_max_available_threads(int value) {
+    max_available_threads_ = value;
+  }
 
  private:
   int max_young_space_size_;
   int max_old_space_size_;
   int max_executable_size_;
   uint32_t* stack_limit_;
+  int max_available_threads_;
 };
 
 
 V8_DEPRECATED(
     "Use SetResourceConstraints(isolate, constraints) instead",
     bool V8_EXPORT SetResourceConstraints(ResourceConstraints* constraints));
 
 
 /**
  * Sets the given ResourceConstraints on the given Isolate.
@@ skipping 2698 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_