public void RequestGetRes(string procName, short resourceId)
{
var procCtrlScan = (ProcessesController)_processesController.Clone();
procCtrlScan.AddRequestRes(procName, resourceId);
try
{
SafeCheck(_resourcesAllocator, procCtrlScan);
}
catch (Exception e)
{
var additionMessage = $"#Error: Impossible to init process [{procName}], because this action goes to deadlock:\n";
throw new Exception(additionMessage + e.Message);
}
_processesController = procCtrlScan;
}
public void ProcGetRes(string procName, short resourceId)
{
var resAllocScan = (ResourcesAllocator)_resourcesAllocator.Clone();
var procCtrlScan = (ProcessesController)_processesController.Clone();
var proc = procCtrlScan.AddAvailableRes(procName, resourceId);
resAllocScan.MakeLink(resourceId, proc.Name);
try
{
SafeCheck(resAllocScan, procCtrlScan);
}
catch (Exception e)
{
var additionMessage = $"#Error: Impossible to init process [{procName}], because this action goes to deadlock:\n";
throw new Exception(additionMessage + e.Message);
}
_resourcesAllocator = resAllocScan;
_processesController = procCtrlScan;
}
public void InitProcess(string procName, IEnumerable <short> availableRes, IEnumerable <short> requestRes)
{
var dosntNeedRes = !availableRes.Any() && !requestRes.Any();
if (dosntNeedRes)
{
var newProcess = new Process(procName, availableRes, requestRes);
_processesController.AddProcess(newProcess);
}
else
{
foreach (var resourceId in availableRes)
{
var inSystem = _resourcesAllocator.CkeckRes(resourceId);
if (!inSystem)
{
throw new Exception($"#Error: Impossible to init process [{procName}], because system doesn't constains resource with id [{resourceId}]");
}
var isfree = _resourcesAllocator.CheckResToFree(resourceId);
if (!isfree)
{
throw new Exception($"#Error: Impossible to init process [{procName}], because another process already uses resource with id [{resourceId}]");
}
}
foreach (var resourceId in requestRes)
{
var inSystem = _resourcesAllocator.CkeckRes(resourceId);
if (!inSystem)
{
throw new Exception($"#Error: Impossible to init process [{procName}], because system doesn't constains resource with id [{resourceId}]");
}
}
if (IsRepeat(availableRes) || IsRepeat(requestRes))
{
throw new Exception($"#Error: One Process [{procName}] can't request (pick up) a single resource twise");
}
var newProcess = new Process(procName, availableRes, requestRes);
var resAllocScan = (ResourcesAllocator)_resourcesAllocator.Clone();
var procCtrlScan = (ProcessesController)_processesController.Clone();
foreach (var resourceId in availableRes)
{
resAllocScan.MakeLink(resourceId, newProcess.Name);
}
procCtrlScan.AddProcess(newProcess);
try
{
SafeCheck(resAllocScan, procCtrlScan);
}
catch (Exception e)
{
var additionMessage = $"#Error: Impossible to init process [{procName}], because this action goes to deadlock:\n";
throw new Exception(additionMessage + e.Message);
}
_resourcesAllocator = resAllocScan;
_processesController = procCtrlScan;
}
}
private static string GetMeassageFromDeadlock(IEnumerable <string> analystic, ProcessesController procCtrl)
{
var sb = new StringBuilder();
var resInDeadlock = new List <string>();
var procInDeadlock = new List <string>();
var analysticList = analystic.ToList();
var index = analysticList.Count - 1;
analysticList.RemoveAt(index);
var processes = procCtrl.Processes;
foreach (var id in analysticList)
{
var isProcess = processes.ContainsKey(id);
if (isProcess)
{
procInDeadlock.Add(id);
foreach (var res in processes[id].AvailableRes)
{
resInDeadlock.Add(res.ToString());
}
}
}
sb.Append("{\nProcess in deadlock:\n");
var counter = 1;
foreach (var procName in procInDeadlock)
{
sb.Append("\t" + counter + ") " + procName + "\n");
++counter;
}
sb.Append("Resources in deadLock:\n");
counter = 1;
foreach (var resName in resInDeadlock)
{
sb.Append("\t" + counter + ") " + resName + "\n");
++counter;
}
sb.Append("}");
return(sb.ToString());
}
private static void SafeCheck(ResourcesAllocator resAlloc, ProcessesController procCtrl)
{
var processes = procCtrl.Processes;
var resources = resAlloc.Resources;
var linksDict = new SortedDictionary <string, int>();
foreach (var procPair in processes)
{
var outLinksCount = procPair.Value.NecessaryRes.Count;
linksDict[procPair.Key] = outLinksCount;
}
foreach (var res in resources)
{
var resName = res.Key.ToString();
linksDict[resName] = (res.Value != null) ? 1 : 0;
}
var nodes = linksDict.Keys.ToList();
var analistycStack = new Stack <string>();
foreach (var startingNode in nodes)
{
var currentNode = startingNode;
analistycStack.Push(currentNode);
while (linksDict[startingNode] != 0 || analistycStack.Count > 1)
{
var outLinkNumber = linksDict[currentNode];
if (outLinkNumber != 0)
{
var isProcess = procCtrl.ProcessInSystem(currentNode);
string nextNode;
if (isProcess)
{
nextNode = processes[currentNode].NecessaryRes[outLinkNumber - 1].ToString();
}
else
{
short.TryParse(currentNode, out var resid);
nextNode = resources[resid];
}
linksDict[currentNode] -= 1;
analistycStack.Push(nextNode);
currentNode = nextNode;
var isCycle = IsRepeat(analistycStack);
if (isCycle)
{
var message = GetMeassageFromDeadlock(analistycStack, procCtrl);
throw new Exception(message);
}
}
else
{
analistycStack.Pop();
currentNode = analistycStack.Peek();
}
}
analistycStack.Clear();
}
}
public MySystem()
{
_resourcesAllocator = new ResourcesAllocator();
_processesController = new ProcessesController();
}