' thread_future.pb — Future/Promise pattern simulation
#COMPILE EXE
#DIM ALL

FUNCTION PBMAIN() AS LONG
    LOCAL futures(20) AS LONG
    LOCAL futureStates(20) AS LONG
    LOCAL futureResults(20) AS LONG
    LOCAL numFutures AS LONG
    LOCAL i AS LONG
    LOCAL j AS LONG
    LOCAL taskResult AS LONG
    LOCAL completedCount AS LONG
    LOCAL allDone AS LONG
    LOCAL totalResults AS LONG
    LOCAL taskArg AS LONG
    LOCAL taskID AS LONG
    LOCAL pollCount AS LONG
    LOCAL resultValue AS LONG
    LOCAL iter AS LONG
    LOCAL maxFutures AS LONG
    LOCAL pendingCount AS LONG

    maxFutures = 6

    FOR i = 0 TO maxFutures - 1
        futures(i) = i
        futureStates(i) = 0
        futureResults(i) = 0
    NEXT i
    numFutures = maxFutures

    PRINT "=== Future/Promise Simulation ==="
    PRINT "Futures created: " + STR$(numFutures)

    FOR i = 0 TO numFutures - 1
        taskID = futures(i)
        taskArg = taskID * 10
        IF taskID MOD 2 = 0 THEN
            taskResult = taskArg * 2
        ELSE
            taskResult = taskArg * 3
        END IF
        futureResults(i) = taskResult
        futureStates(i) = 1
        PRINT "  Future " + STR$(taskID) + ": result=" + STR$(taskResult)
    NEXT i

    pollCount = 0
    WHILE 1
        completedCount = 0
        FOR i = 0 TO numFutures - 1
            IF futureStates(i) = 1 THEN
                completedCount = completedCount + 1
            END IF
        NEXT i
        pollCount = pollCount + 1
        IF completedCount = numFutures THEN
            EXIT LOOP
        END IF
        IF pollCount > 100 THEN
            EXIT LOOP
        END IF
    WEND

    PRINT "Polling rounds: " + STR$(pollCount)
    totalResults = 0
    FOR i = 0 TO numFutures - 1
        resultValue = futureResults(i)
        totalResults = totalResults + resultValue
        PRINT "  Future " + STR$(futures(i)) + " = " + STR$(resultValue)
    NEXT i
    PRINT "Total: " + STR$(totalResults)

    PRINT "=== End Future ==="
    FUNCTION = 0
END FUNCTION
