CODEWITHSUNDEEP
c++multithreadingtbb
James
James

Reputation: 95

How to use TBB to run a function in a single thread

I'm trying to use TBB to use just one thread to run this piece of code but I do not know how to proceed.

I have read that I should use tbb::task_group but I do not know how to use it. 

void CScene::load(const std::string &_name) {
  if (!references++) {
   setName(_name);
   Resources.setCurrentScene(my_name);

   TEntityParseContext ctx;
   ctx.name = my_name;
   parseScene("data/scenes/" + my_name + ".scene", ctx);

   dynamic = ctx.dynamic_scene;
   for (CHandle e : ctx.entities_loaded) {
     entities.push_back(e);
   }

   Engine.getScriptingModule().raiseEvent(CModuleScripting::SCENE_LOADED, 
   my_name);

   Resources.setCurrentScene("system");
  }
}

By the way, entities is a std::vector<CHandle> which is a private variable of the class

Upvotes: 1

Views: 503

Answers (1)

Mike van Dyke
Mike van Dyke

Reputation: 2868

You just have to pass a lambda to the task_group::run function:

CScene cs;
tbb::task_group g;

g.run([&cs]{cs.load("Name");});

// maybe do some other work here

// This function either waits or executes the lambda 
// if no other thread is executing it
g.wait();

Upvotes: 2

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