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Restart the io_context in preparation for
a subsequent run()
invocation.
void restart();
This function must be called prior to any second or later set of invocations
of the run(),
run_one(),
poll()
or poll_one()
functions when a previous invocation of these functions returned due to
the io_context
being stopped or running out of work. After a call to restart(), the io_context object's stopped()
function will return false.
This function must not be called while there are any unfinished calls to
the run(),
run_one(),
poll()
or poll_one()
functions.