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##### io_service::run (1 of 2 overloads)

Run the `io_service` object's event processing loop.

    std::size_t run();

The `run()` function blocks until all work has finished and there are no more handlers to be dispatched, or until the `io_service` has been stopped.

Multiple threads may call the `run()` function to set up a pool of threads from which the `io_service` may execute handlers. All threads that are waiting in the pool are equivalent and the `io_service` may choose any one of them to invoke a handler.

The `run()` function may be safely called again once it has completed only after a call to `reset()`.

###### Return Value

The number of handlers that were executed.

###### Exceptions

boost::system::system_error

  Thrown on failure.

###### Remarks

The `run()` function must not be called from a thread that is currently calling one of `run()`, `run_one()`, `poll()` or `poll_one()` on the same `io_service` object.

The `poll()` function may also be used to dispatch ready handlers, but without blocking.