ThreadState Enum
Definition
Important
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Specifies the execution states of a Thread.
This enumeration supports a bitwise combination of its member values.
public enum class ThreadState[System.Flags]
public enum ThreadState[System.Flags]
[System.Runtime.InteropServices.ComVisible(true)]
public enum ThreadState[System.Flags]
[System.Serializable]
public enum ThreadState[System.Flags]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum ThreadState[<System.Flags>]
type ThreadState = [<System.Flags>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type ThreadState = [<System.Flags>]
[<System.Serializable>]
type ThreadState = [<System.Flags>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Serializable>]
type ThreadState = Public Enum ThreadState- Inheritance
- Attributes
Fields
| Name | Value | Description |
|---|---|---|
| Running | 0 | The thread has been started and not yet stopped. |
| StopRequested | 1 | The thread is being requested to stop. This is for internal use only. |
| SuspendRequested | 2 | The thread is being requested to suspend. |
| Background | 4 | The thread is being executed as a background thread, as opposed to a foreground thread. This state is controlled by setting the IsBackground property. |
| Unstarted | 8 | The Start() method has not been invoked on the thread. |
| Stopped | 16 | The thread has stopped. |
| WaitSleepJoin | 32 | The thread is blocked. This could be the result of calling Sleep(Int32) or Join(), of requesting a lock - for example, by calling Enter(Object) or Wait(Object, Int32, Boolean) - or of waiting on a thread synchronization object such as ManualResetEvent. |
| Suspended | 64 | The thread has been suspended. |
| AbortRequested | 128 | The Abort(Object) method has been invoked on the thread, but the thread has not yet received the pending ThreadAbortException that will attempt to terminate it. |
| Aborted | 256 | The thread state includes AbortRequested and the thread is now dead, but its state has not yet changed to Stopped. |
Remarks
The ThreadState enumeration defines a set of all possible execution states for threads. It's of interest only in a few debugging scenarios. Your code should never use the thread state to synchronize the activities of threads.
Once a thread is created, it's in at least one of the states until it terminates. Threads created within the common language runtime are initially in the Unstarted state, while external, or unmanaged, threads that come into the runtime are already in the Running state. A thread is transitioned from the Unstarted state into the Running state by calling Thread.Start. Once a thread leaves the Unstarted state as the result of a call to Start, it can never return to the Unstarted state.
A thread can be in more than one state at a given time. For example, if a thread is blocked on a call to Monitor.Wait, and another thread calls Thread.Abort on the blocked thread, the blocked thread will be in both the WaitSleepJoin and AbortRequested states at the same time. In this case, as soon as the thread returns from the call to Monitor.Wait or is interrupted, it will receive the ThreadAbortException to begin aborting. Not all combinations of ThreadState values are valid; for example, a thread cannot be in both the Aborted and