public static void AiMinMaxSearchAsyncStopRequest(this IGameBoardState gbs)
{
if (jobStatus != AIMinMaxJobStatus.Started && jobStatus != AIMinMaxJobStatus.Finished)
{
throw new System.Exception("Impossible to end an AI job that has not started.");
}
lock (jobLock)
{
if (jobStatus == AIMinMaxJobStatus.Started)
{
jobStatus = AIMinMaxJobStatus.StopRequested;
}
}
}
public static void JoinThreads()
{
if (jobThread != null)
{
lock (jobLock)
{
if (jobStatus != AIMinMaxJobStatus.Finished)
{
jobStatus = AIMinMaxJobStatus.StopRequested;
}
}
jobThread.Join();
jobStatus = AIMinMaxJobStatus.None;
}
}
public static void AIMinMaxSearchAsyncBegin(this IGameBoardState gbs, int searchLevels, Player.PlayerNumber currentPlayer)
{
if (jobStatus != AIMinMaxJobStatus.None)
{
throw new System.Exception("Only 1 async job should run at a time. This must be enforced in the game logic.");
}
jobStatus = AIMinMaxJobStatus.Started;
LevelsSearched = 0;
StatesSearched = 0;
MovesSearched = 0;
Debug.Log("AI Thread Started");
//clone gameboardstate to ensure it is not a MonoBehavior - we need to pass it to a new thread
IGameBoardState gbs_clone = gbs.Clone();
jobThread = new Thread(() =>
{
///must run at least one level to complete
jobResult = gbs_clone.AIMinMaxSearch(1, currentPlayer);
LevelsSearched++;
//code is in an iterative deepening pattern, but I is initialized to the deepest level for testing
//usually i should start at 2 and iterate forward
for (int i = searchLevels; i <= searchLevels; i++)
{
AIMinMaxResult res = gbs_clone.AIMinMaxSearch(i, currentPlayer);
if (jobStatus == AIMinMaxJobStatus.StopRequested)
{
break;
}
LevelsSearched++;
jobResult = res;
}
lock (jobLock)
{
jobStatus = AIMinMaxJobStatus.Finished;
Debug.Log("AI Thread Finished");
}
});
jobThread.IsBackground = true;
jobThread.Start();
}
/// <summary>
/// Asyncronous end blocks the calling thread until it's finished.
/// </summary>
/// <returns></returns>
public static AIMinMaxResult AIMinMaxSearchAsyncEnd(this IGameBoardState gbs)
{
Debug.Log("Tried ending AI thread in state " + jobStatus.ToString());
if (jobStatus != AIMinMaxJobStatus.Started && jobStatus != AIMinMaxJobStatus.Finished)
{
throw new System.Exception("Impossible to end an AI job that has not started.");
}
lock (jobLock)
{
if (jobStatus != AIMinMaxJobStatus.Finished)
{
jobStatus = AIMinMaxJobStatus.StopRequested;
}
}
jobThread.Join();
jobStatus = AIMinMaxJobStatus.None;
return(jobResult);
}