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2013-04-18T12:24:33.667
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2013-04-18T12:24:33.667
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<p>If you're using the C++11 thread library (or Boost.Thread) then what you probably want is a <a href="http://en.cppreference.com/w/cpp/thread/future" rel="nofollow"><code>std::future</code></a>. They can be obtained in one of three ways:</p> <ol> <li>By passing a <a href="http://en.cppreference.com/w/cpp/thread/promise" rel="nofollow"><code>std::promise</code></a> to a thread and having it set the value.</li> <li>By using a <a href="http://en.cppreference.com/w/cpp/thread/packaged_task" rel="nofollow"><code>std::packaged_task</code></a>.</li> <li>By calling <a href="http://en.cppreference.com/w/cpp/thread/async" rel="nofollow"><code>std::async</code></a>.</li> </ol> <p>Here's an example using <code>std::async</code>:</p> <pre><code>some_return_type my_work_function( some_input_type const & ); some_input_type inputs_to_slave_threads[] = { /* ... */ }; std::future< some_return_type > // launch the slaves, letting the OS decide whether to spawn new threads slave_0_future = std::async( my_work_function, std::ref( inputs_to_slave_threads[0] ) ), slave_1_future = std::async( my_work_function, std::ref( inputs_to_slave_threads[1] ) ), // ... slave_N_future = std::async( my_work_function, std::ref( inputs_to_slave_threads[N] ) ); some_return_type // block until results are ready result_of_slave_0 = slave_0_future.get(), result_of_slave_1 = slave_1_future.get(), // ... result_of_slave_N = slave_N_future.get(); process_results_of_slaves( result_of_slave_0, ..., result_of_slave_N ); </code></pre>
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1. POHow to collect values returned from slave to master in parallel programming?
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1. USAndrew Durward
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