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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "runnable.h"
#include <vector>
namespace vespalib {
/**
* Interface used to separate the ownership and deployment of a
* collection of threads cooperating to perform a partitioned
* operation in parallel.
**/
struct ThreadBundle {
/**
* The size of the thread bundle is defined to be the maximum
* number of runnables that can be performed in parallel by the
* run function.
*
* @return size of this thread bundle
**/
virtual size_t size() const = 0;
/**
* Performs all the given runnables in parallel and waits for
* their completion. This function cannot be called with more
* targets than the size of this bundle.
**/
virtual void run(const std::vector<Runnable*> &targets) = 0;
/**
* Empty virtual destructor to enable subclassing.
**/
virtual ~ThreadBundle() {}
// a thread bundle that can only run things in the current thread.
static ThreadBundle &trivial();
};
} // namespace vespalib
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