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Revised ManualResetEvent remarks #1739

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rpetrusha merged 5 commits into from
Feb 5, 2019
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Revised ManualResetEvent remarks #1739

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Revised ManualResetEvent remarks
pkulikov Jan 30, 2019
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pkulikov committed Jan 30, 2019
commit e387fb42292db98a529a540975841196826990f9
2 changes: 1 addition & 1 deletion xml/System.Threading/ManualResetEvent.xml
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You use `ManualResetEvent`, <xref:System.Threading.AutoResetEvent>, and <xref:System.Threading.EventWaitHandle> for thread interaction (or thread signaling). For more information, see the [Thread interaction, or signaling](~/docs/standard/threading/overview-of-synchronization-primitives.md#thread-interaction-or-signaling) section of the [Overview of synchronization primitives](~/docs/standard/threading/overview-of-synchronization-primitives.md) article.

When a thread begins an activity that must complete before other threads proceed, it calls <xref:System.Threading.EventWaitHandle.Reset%2A> to put `ManualResetEvent` in the non-signaled state. This thread can be thought of as controlling the `ManualResetEvent`. Threads that call <xref:System.Threading.WaitHandle.WaitOne%2A> on the `ManualResetEvent` block, awaiting the signal. When the controlling thread completes the activity, it calls <xref:System.Threading.EventWaitHandle.Set%2A> to signal that the waiting threads can proceed. All waiting threads are released.
When a thread begins an activity that must complete before other threads proceed, it calls [ManualResetEvent.Reset](xref:System.Threading.EventWaitHandle.Reset%2A) to put `ManualResetEvent` in the non-signaled state. This thread can be thought of as controlling the `ManualResetEvent`. Threads that call [ManualResetEvent.WaitOne](xref:System.Threading.WaitHandle.WaitOne%2A) blocks, awaiting the signal. When the controlling thread completes the activity, it calls [ManualResetEvent.Set](xref:System.Threading.EventWaitHandle.Set%2A) to signal that the waiting threads can proceed. All waiting threads are released.

Once it has been signaled, `ManualResetEvent` remains signaled until it is manually reset. That is, calls to <xref:System.Threading.WaitHandle.WaitOne%2A> return immediately.

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