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ProcessThread.cs
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/
ProcessThread.cs
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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.
using System.ComponentModel;
using System.Runtime.Versioning;
namespace System.Diagnostics
{
/// <devdoc>
/// <para>
/// Represents a Win32 thread. This can be used to obtain
/// information about the thread, such as it's performance characteristics. This is
/// returned from the System.Diagnostics.Process.ProcessThread property of the System.Diagnostics.Process component.
/// </para>
/// </devdoc>
[Designer("System.Diagnostics.Design.ProcessThreadDesigner, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public partial class ProcessThread : Component
{
private readonly bool _isRemoteMachine;
private readonly int _processId;
private readonly ThreadInfo _threadInfo;
private bool? _priorityBoostEnabled;
private ThreadPriorityLevel? _priorityLevel;
/// <devdoc>
/// Internal constructor.
/// </devdoc>
/// <internalonly/>
internal ProcessThread(bool isRemoteMachine, int processId, ThreadInfo threadInfo)
{
_isRemoteMachine = isRemoteMachine;
_processId = processId;
_threadInfo = threadInfo;
}
/// <devdoc>
/// Returns the base priority of the thread which is computed by combining the
/// process priority class with the priority level of the associated thread.
/// </devdoc>
public int BasePriority
{
get { return _threadInfo._basePriority; }
}
/// <devdoc>
/// The current priority indicates the actual priority of the associated thread,
/// which may deviate from the base priority based on how the OS is currently
/// scheduling the thread.
/// </devdoc>
public int CurrentPriority
{
get { return _threadInfo._currentPriority; }
}
/// <devdoc>
/// Returns the unique identifier for the associated thread.
/// </devdoc>
public int Id
{
get { return unchecked((int)_threadInfo._threadId); }
}
/// <devdoc>
/// Returns or sets whether this thread would like a priority boost if the user interacts
/// with user interface associated with this thread.
/// </devdoc>
public bool PriorityBoostEnabled
{
get
{
if (!_priorityBoostEnabled.HasValue)
{
_priorityBoostEnabled = PriorityBoostEnabledCore;
}
return _priorityBoostEnabled.Value;
}
set
{
PriorityBoostEnabledCore = value;
_priorityBoostEnabled = value;
}
}
/// <devdoc>
/// Returns or sets the priority level of the associated thread. The priority level is
/// not an absolute level, but instead contributes to the actual thread priority by
/// considering the priority class of the process.
/// </devdoc>
public ThreadPriorityLevel PriorityLevel
{
[SupportedOSPlatform("windows")]
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("freebsd")]
get
{
if (!_priorityLevel.HasValue)
{
_priorityLevel = PriorityLevelCore;
}
return _priorityLevel.Value;
}
[SupportedOSPlatform("windows")]
set
{
PriorityLevelCore = value;
_priorityLevel = value;
}
}
/// <devdoc>
/// Returns the memory address of the function that was called when the associated
/// thread was started.
/// </devdoc>
public unsafe IntPtr StartAddress
{
get { return (IntPtr)_threadInfo._startAddress; }
}
/// <devdoc>
/// Returns the current state of the associated thread, e.g. is it running, waiting, etc.
/// </devdoc>
public ThreadState ThreadState
{
get { return _threadInfo._threadState; }
}
/// <devdoc>
/// Returns the reason the associated thread is waiting, if any.
/// </devdoc>
public ThreadWaitReason WaitReason
{
get
{
if (_threadInfo._threadState != ThreadState.Wait)
{
throw new InvalidOperationException(SR.WaitReasonUnavailable);
}
return _threadInfo._threadWaitReason;
}
}
/// <summary>Returns the time the associated thread was started.</summary>
[SupportedOSPlatform("windows")]
[SupportedOSPlatform("linux")]
public DateTime StartTime
{
get => GetStartTime();
}
/// <devdoc>
/// Helper to check preconditions for property access.
/// </devdoc>
private void EnsureState(State state)
{
if (((state & State.IsLocal) != (State)0) && _isRemoteMachine)
{
throw new NotSupportedException(SR.NotSupportedRemoteThread);
}
}
/// <summary>
/// Preconditions for accessing properties.
/// </summary>
/// <internalonly/>
private enum State
{
IsLocal = 0x2
}
}
}