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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Runtime.CompilerServices;
namespace System.Threading.Tasks
{
//
// This class encapsulates the infrastructure to emit AsyncCausality events and Task-ID tracking for the use of the debugger.
//
internal static partial class DebuggerSupport
{
//==============================================================================================================
// This section of the class tracks adds the ability to retrieve an active Task from its ID. The debugger
// is only component that needs this tracking so we only enable it when the debugger specifically requests it
// by setting Task.s_asyncDebuggingEnabled.
//==============================================================================================================
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void AddToActiveTasks(Task task)
{
if (Task.s_asyncDebuggingEnabled)
AddToActiveTasksNonInlined(task);
}
[MethodImpl(MethodImplOptions.NoInlining)]
private static void AddToActiveTasksNonInlined(Task task)
{
int id = task.Id;
lock (s_activeTasksLock)
{
s_activeTasks[id] = task;
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void RemoveFromActiveTasks(Task task)
{
if (Task.s_asyncDebuggingEnabled)
RemoveFromActiveTasksNonInlined(task);
}
[MethodImpl(MethodImplOptions.NoInlining)]
private static void RemoveFromActiveTasksNonInlined(Task task)
{
int id = task.Id;
lock (s_activeTasksLock)
{
s_activeTasks.Remove(id);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Task GetActiveTaskFromId(int taskId)
{
Task task = null;
s_activeTasks.TryGetValue(taskId, out task);
return task;
}
private static readonly LowLevelDictionary<int, Task> s_activeTasks = new LowLevelDictionary<int, Task>();
private static readonly object s_activeTasksLock = new object();
//==============================================================================================================
// This section of the class wraps calls to get the lazy-created Task object for the purpose of reporting
// async causality events to the debugger.
//==============================================================================================================
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Task GetTaskIfDebuggingEnabled(this AsyncVoidMethodBuilder builder)
{
if (LoggingOn || Task.s_asyncDebuggingEnabled)
return builder.Task;
else
return null;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Task GetTaskIfDebuggingEnabled(this AsyncTaskMethodBuilder builder)
{
if (LoggingOn || Task.s_asyncDebuggingEnabled)
return builder.Task;
else
return null;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Task GetTaskIfDebuggingEnabled<TResult>(this AsyncTaskMethodBuilder<TResult> builder)
{
if (LoggingOn || Task.s_asyncDebuggingEnabled)
return builder.Task;
else
return null;
}
}
}
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