private static List <Tuple <XElement, XElement> > CreateNodeLabels(Dictionary <JoinableTask, XElement> tasksAndElements)
{
Requires.NotNull(tasksAndElements, nameof(tasksAndElements));
var result = new List <Tuple <XElement, XElement> >();
foreach (KeyValuePair <JoinableTask, XElement> tasksAndElement in tasksAndElements)
{
JoinableTask?pendingTask = tasksAndElement.Key;
XElement? node = tasksAndElement.Value;
int queueIndex = 0;
foreach (JoinableTaskFactory.SingleExecuteProtector?pendingTasksElement in pendingTask.MainThreadQueueContents)
{
queueIndex++;
XElement?callstackNode = Dgml.Node(node.Attribute("Id").Value + "MTQueue#" + queueIndex, GetAsyncReturnStack(pendingTasksElement));
XElement?callstackLink = Dgml.Link(callstackNode, node);
result.Add(Tuple.Create(callstackNode, callstackLink));
}
foreach (JoinableTaskFactory.SingleExecuteProtector?pendingTasksElement in pendingTask.ThreadPoolQueueContents)
{
queueIndex++;
XElement?callstackNode = Dgml.Node(node.Attribute("Id").Value + "TPQueue#" + queueIndex, GetAsyncReturnStack(pendingTasksElement));
XElement?callstackLink = Dgml.Link(callstackNode, node);
result.Add(Tuple.Create(callstackNode, callstackLink));
}
}
return(result);
}
private static XDocument CreateTemplateDgml(out XElement nodes, out XElement links)
{
return(Dgml.Create(out nodes, out links)
.WithCategories(
Dgml.Category("MainThreadBlocking", "Blocking main thread", background: "#FFF9FF7F", isTag: true),
Dgml.Category("NonEmptyQueue", "Non-empty queue", background: "#FFFF0000", isTag: true)));
}
private static XDocument CreateDgml(out XElement nodes, out XElement links)
{
return(Dgml.Create(out nodes, out links, layout: "ForceDirected", direction: "BottomToTop")
.WithCategories(
Dgml.Category("Waiting", icon: "pack://application:,,,/Microsoft.VisualStudio.Progression.GraphControl;component/Icons/kpi_yellow_cat1_large.png"),
Dgml.Category("Issued", icon: "pack://application:,,,/Microsoft.VisualStudio.Progression.GraphControl;component/Icons/kpi_green_sym2_large.png"),
Dgml.Category("Released", icon: "pack://application:,,,/Microsoft.VisualStudio.Progression.GraphControl;component/Icons/kpi_red_sym2_large.png"),
Dgml.Category("ReadLock", background: "#FF7476AF"),
Dgml.Category("UpgradeableReadLock", background: "#FFFFBF00"),
Dgml.Category("WriteLock", background: "#FFC79393")));
}
protected virtual HangReportContribution GetHangReport()
{
using (this.NoMessagePumpSynchronizationContext.Apply())
{
// It's possible that the hang is due to a deadlock on our own private lock,
// so while we're reporting the hang, don't accidentally deadlock ourselves
// while trying to do the right thing by taking the lock.
bool lockAcquired = false;
try
{
Monitor.TryEnter(this.syncObject, 1000, ref lockAcquired);
XElement nodes, links;
var dgml = CreateDgml(out nodes, out links);
if (!lockAcquired)
{
nodes.Add(Dgml.Comment("WARNING: failed to acquire our own lock in formulating this report."));
}
var liveAwaiterMetadata = new HashSet <AwaiterMetadata>();
liveAwaiterMetadata.UnionWith(this.waitingReaders.Select(a => new AwaiterMetadata(a, AwaiterCollection.Waiting | AwaiterCollection.ReadLock)));
liveAwaiterMetadata.UnionWith(this.waitingUpgradeableReaders.Select(a => new AwaiterMetadata(a, AwaiterCollection.Waiting | AwaiterCollection.UpgradeableReadLock)));
liveAwaiterMetadata.UnionWith(this.waitingWriters.Select(a => new AwaiterMetadata(a, AwaiterCollection.Waiting | AwaiterCollection.WriteLock)));
liveAwaiterMetadata.UnionWith(this.issuedReadLocks.Select(a => new AwaiterMetadata(a, AwaiterCollection.Issued | AwaiterCollection.ReadLock)));
liveAwaiterMetadata.UnionWith(this.issuedUpgradeableReadLocks.Select(a => new AwaiterMetadata(a, AwaiterCollection.Issued | AwaiterCollection.UpgradeableReadLock)));
liveAwaiterMetadata.UnionWith(this.issuedWriteLocks.Select(a => new AwaiterMetadata(a, AwaiterCollection.Issued | AwaiterCollection.WriteLock)));
var liveAwaiters = liveAwaiterMetadata.Select(am => am.Awaiter);
var releasedAwaiterMetadata = new HashSet <AwaiterMetadata>(liveAwaiters.SelectMany(GetLockStack).Distinct().Except(liveAwaiters).Select(AwaiterMetadata.Released));
var allAwaiterMetadata = new HashSet <AwaiterMetadata>(liveAwaiterMetadata.Concat(releasedAwaiterMetadata));
// Build the lock stack containers.
dgml.WithContainers(allAwaiterMetadata.Select(am => am.GroupId).Distinct().Select(id => Dgml.Container(id, "Lock stack")));
// Add each lock awaiter.
nodes.Add(allAwaiterMetadata.Select(am => CreateAwaiterNode(am.Awaiter).WithCategories(am.Categories.ToArray()).ContainedBy(am.GroupId, dgml)));
// Link the lock stacks among themselves.
links.Add(allAwaiterMetadata.Where(a => a.Awaiter.NestingLock != null).Select(a => Dgml.Link(GetAwaiterId(a.Awaiter.NestingLock), GetAwaiterId(a.Awaiter))));
return(new HangReportContribution(
dgml.ToString(),
"application/xml",
this.GetType().Name + ".dgml"));
}
finally
{
if (lockAcquired)
{
Monitor.Exit(this.syncObject);
}
}
}
}
private static XElement CreateAwaiterNode(Awaiter awaiter)
{
Requires.NotNull(awaiter, nameof(awaiter));
var label = new StringBuilder();
label.AppendLine(awaiter.Kind.ToString());
if (awaiter.Options != LockFlags.None)
{
label.AppendLine("Options: " + awaiter.Options);
}
Delegate lockWaitingContinuation;
#if DESKTOP
if (awaiter.RequestingStackTrace != null)
{
label.AppendLine(awaiter.RequestingStackTrace.ToString());
}
#endif
if ((lockWaitingContinuation = awaiter.LockRequestingContinuation) != null)
{
try
{
foreach (var frame in lockWaitingContinuation.GetAsyncReturnStackFrames())
{
label.AppendLine(frame);
}
}
catch (Exception ex)
{
// Just eat the exception so we don't crash during a hang report.
Report.Fail("GetAsyncReturnStackFrames threw exception: ", ex);
}
}
if (label.Length >= Environment.NewLine.Length)
{
label.Length -= Environment.NewLine.Length;
}
XElement element = Dgml.Node(GetAwaiterId(awaiter), label.ToString());
return(element);
}
private static ICollection <XElement> CreateCollectionContainingTaskLinks(Dictionary <JoinableTask, XElement> tasks, Dictionary <JoinableTaskCollection, XElement> collections)
{
Requires.NotNull(tasks, nameof(tasks));
Requires.NotNull(collections, nameof(collections));
var result = new List <XElement>();
foreach (KeyValuePair <JoinableTask, XElement> task in tasks)
{
foreach (JoinableTaskCollection?collection in task.Key.ContainingCollections)
{
XElement?collectionElement = collections[collection];
result.Add(Dgml.Link(collectionElement, task.Value).WithCategories("Contains"));
}
}
return(result);
}
private static ICollection <XElement> CreatesLinksBetweenNodes(Dictionary <JoinableTask, XElement> pendingTasksElements)
{
Requires.NotNull(pendingTasksElements, nameof(pendingTasksElements));
var links = new List <XElement>();
foreach (KeyValuePair <JoinableTask, XElement> joinableTaskAndElement in pendingTasksElements)
{
foreach (JoinableTask?joinedTask in JoinableTaskDependencyGraph.GetAllDirectlyDependentJoinableTasks(joinableTaskAndElement.Key))
{
if (pendingTasksElements.TryGetValue(joinedTask, out XElement? joinedTaskElement))
{
links.Add(Dgml.Link(joinableTaskAndElement.Value, joinedTaskElement));
}
}
}
return(links);
}
private static Dictionary <JoinableTaskCollection, XElement> CreateNodesForJoinableTaskCollections(IEnumerable <JoinableTask> tasks)
{
Requires.NotNull(tasks, nameof(tasks));
var collectionsSet = new HashSet <JoinableTaskCollection>(tasks.SelectMany(t => t.ContainingCollections));
var result = new Dictionary <JoinableTaskCollection, XElement>(collectionsSet.Count);
int collectionId = 0;
foreach (JoinableTaskCollection?collection in collectionsSet)
{
collectionId++;
var label = string.IsNullOrEmpty(collection.DisplayName) ? "Collection #" + collectionId : collection.DisplayName;
XElement?element = Dgml.Node("Collection#" + collectionId, label, group: "Expanded")
.WithCategories("Collection");
result.Add(collection, element);
}
return(result);
}
private static ICollection <XElement> CreatesLinksBetweenNodes(Dictionary <JoinableTask, XElement> pendingTasksElements)
{
Requires.NotNull(pendingTasksElements, nameof(pendingTasksElements));
var links = new List <XElement>();
foreach (var joinableTaskAndElement in pendingTasksElements)
{
foreach (var joinedTask in joinableTaskAndElement.Key.ChildOrJoinedJobs)
{
if (pendingTasksElements.TryGetValue(joinedTask, out XElement joinedTaskElement))
{
links.Add(Dgml.Link(joinableTaskAndElement.Value, joinedTaskElement));
}
}
}
return(links);
}
private Dictionary <JoinableTask, XElement> CreateNodesForPendingTasks()
{
var pendingTasksElements = new Dictionary <JoinableTask, XElement>();
lock (this.pendingTasks)
{
int taskId = 0;
foreach (JoinableTask?pendingTask in this.pendingTasks)
{
taskId++;
string methodName = string.Empty;
System.Reflection.MethodInfo?entryMethodInfo = pendingTask.EntryMethodInfo;
if (entryMethodInfo is object)
{
methodName = string.Format(
CultureInfo.InvariantCulture,
" ({0}.{1})",
entryMethodInfo.DeclaringType?.FullName,
entryMethodInfo.Name);
}
XElement?node = Dgml.Node("Task#" + taskId, "Task #" + taskId + methodName)
.WithCategories("Task");
if (pendingTask.HasNonEmptyQueue)
{
node.WithCategories("NonEmptyQueue");
}
if (pendingTask.State.HasFlag(JoinableTask.JoinableTaskFlags.SynchronouslyBlockingMainThread))
{
node.WithCategories("MainThreadBlocking");
}
pendingTasksElements.Add(pendingTask, node);
}
}
return(pendingTasksElements);
}
