// run the algo, print some output and catch if won.
// straightAhead: true: new direction are initialized with current dir, false: init with 0
func Run(e engine.Engine, single bool, outputFreq int32, printSurface bool, straightAhead bool, threads int) {
steps, solutions, solSteps = 0, 0, []int32{}
numWorkers = 0
running = true
cDone = make(chan int8, threads) // queue for threads
cHistory = make(chan bool, 1) // mutex on global history object
// preprocessing
MarkDeadFields(&e.Surface)
e.Print()
// init time counter
syscall.Gettimeofday(&starttime)
// ???
// runtime.GOMAXPROCS(runtime.NumCPU())
// init path
path := Path{}
path.Push(engine.NO_DIRECTION)
// create history store and save initial constellation
history = newHistoryTree(-1, -1)
newHist := e.GetBoxesAndX()
addHistory(&history, newHist)
// prepare for starting workers
wg.Add(1)
cDone <- 1
go runWorker(e, path, threads, single, outputFreq, printSurface, straightAhead)
// wait for all workers to finish
wg.Wait()
// time.Sleep(1 * time.Second)
// print result
min, sec, µsec := getTimePassed(starttime)
log.A("Run finished with %d steps after %dm %ds %dµs.\n%d solutions found at following steps:\n%d\n", steps, min, sec, µsec, solutions, solSteps)
}
func runWorker(e engine.Engine, basePath Path, threads int, single bool, outputFreq int32, printSurface bool, straightAhead bool) {
// make sure, process will wait for this worker
defer wg.Done()
gorNo := numWorkers
numWorkers++
log.I(gorNo, "runWorker %d created, %d running", gorNo, runtime.NumGoroutine())
e.Id = gorNo
// path := Path{basePath[len(basePath)-1].Clone()}
path := basePath[len(basePath)-1:]
basePath = basePath[:len(basePath)-1]
// basePath = basePath.Clone()
// log.I(gorNo, "path: %d, basePath: %d", path, basePath)
for {
var ignoredDir = false
ignoredDir = false
// ### 1. check if finished
if path.Empty() || !running {
log.D(e.Id, "Empty path / stopped executition. Hopefully all possibilities tried ;)")
break
}
// ### 2. increase the current direction to try the next possibility
path.IncCurrentDir()
// ### 3. check if rotation is finished. Then backtrack
if path.CurrentCounter() > 3 {
var dir = path.Current().PopIgnored()
if dir == -1 {
log.D(e.Id, "Rotation finished. Deadlock. Backtrack.")
e.UndoStep()
path.Pop()
continue
} else {
path.SetCurrentDir(dir)
ignoredDir = true
}
}
// ### 4a. check if there is a box in direction dir and if this box is on a point
cf := e.FigPos() // current figureposition
nf := cf.Add(path.CurrentDir().Point()) // potential new figureposition
if e.Surface[nf.Y][nf.X].Point && e.Surface[nf.Y][nf.X].Box != 0 && !ignoredDir {
log.D(e.Id, "Do not moving a box from a point")
path.Current().PushIgnored(path.CurrentDir())
continue
}
// ### 4b. Try moving
log.D(e.Id, "Try moving in dir=%d", path.CurrentDir())
moved, boxMoved := e.Move(path.CurrentDir())
if !moved {
log.D(e.Id, "Could not move.")
continue
}
// ### 5. If moved, first check if not in a loop
newHist := e.GetBoxesAndX()
if everBeenHere(&history, newHist) {
log.D(e.Id, "I'v been here already. Backtrack: %d", newHist)
e.UndoStep()
continue
}
// ### 6. If not in a loop, append history and go on
addHistory(&history, newHist)
if straightAhead {
path.Push(path.CurrentDir() - 1)
} else {
path.Push(-1)
}
log.D(e.Id, "Moved. Path added.")
// ### 7. Do some statistics
incSteps()
if printSurface {
e.Print()
}
if steps%outputFreq == 0 {
min, sec, µsec := getTimePassed(starttime)
log.I(gorNo, "Steps: %9d; %4dm %2ds %6dµs", steps, min, sec, µsec)
}
// ### 8. Do we already won? :)
if boxMoved != 0 && e.Won() {
incSolutions()
min, sec, µsec := getTimePassed(starttime)
stepsCpy := steps
log.Lock <- 1
log.A("%d. solution found after %d steps, %4dm %2ds %6dµs.\nPath: %d%d\n", solutions, stepsCpy, min, sec, µsec, basePath.Directions(), path.Directions())
<-log.Lock
e.Print()
solSteps = append(solSteps, stepsCpy)
if single {
running = false
break
}
e.UndoStep()
path.Pop()
}
// ### 9. Decide if we just go on or if we start a new thread
if len(cDone) < threads {
wg.Add(1)
cDone <- 1
ne := e.Clone()
log.I(gorNo, "Creating new worker")
go runWorker(ne, path.Clone(), threads, single, outputFreq, printSurface, straightAhead)
// go back, as we deligated current dir go worker
// time.Sleep(3 * time.Second)
e.UndoStep()
path.Pop()
}
}
<-cDone
log.I(gorNo, "runWorker %d finished", gorNo)
}