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== Interface to user-provided player

Give player 5 seconds per move without race conditions

• Player actor receives request to make next move
• request is added to a fifo queue
• extra thread continuously blocks on the queue head and calls nextMove
• within nextMove user-provided player frequently updates the improved next move
• within nextMove user-provided player frequently calls checkpoint function that reports if timeout has been reached
• nextMove is supposed to return soon if timeout has been reached or computation is done.
• any delay reduces the time available for the next move!
• if queue is not empty reported moves are ignored (user player is delayed)
• after 5 seconds
• the timeout flag is set, i.e. checkpoint function reports timeout
• the latest reported move is sent back to the game actor
• Game actor sends SIGSTOP to player’s JVM
• Game actor sends SIGSTART to other player’s JVM
• Game actor sends request to make next move to other player
• loop