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Imported Upstream version 5.4.0.167

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Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa
This commit is contained in:
Xamarin Public Jenkins (auto-signing)
2017-08-21 15:34:15 +00:00
parent e49d6f06c0
commit 536cd135cc
12856 changed files with 563812 additions and 223249 deletions
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10
mcs/class/referencesource/mscorlib/system/progress.cs
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@ -7,7 +7,7 @@
**
** Class: Progress<T>
**
** <OWNER>[....]</OWNER>
** <OWNER>Microsoft</OWNER>
**
**
** Purpose: Event-based implementation of IProgress<T>.
@ -46,8 +46,8 @@ namespace System
public Progress()
{
// Capture the current synchronization context. "current" is determined by CurrentNoFlow,
// which doesn't consider the [....] ctx flown with an ExecutionContext, avoiding
// [....] ctx reference identity issues where the [....] ctx for one thread could be Current on another.
// which doesn't consider the sync ctx flown with an ExecutionContext, avoiding
// sync ctx reference identity issues where the sync ctx for one thread could be Current on another.
// If there is no current context, we use a default instance targeting the ThreadPool.
m_synchronizationContext = SynchronizationContext.CurrentNoFlow ?? ProgressStatics.DefaultContext;
Contract.Assert(m_synchronizationContext != null);
@ -80,14 +80,14 @@ namespace System
/// <param name="value">The value of the updated progress.</param>
protected virtual void OnReport(T value)
{
// If there's no handler, don't bother going through the [....] context.
// If there's no handler, don't bother going through the sync context.
// Inside the callback, we'll need to check again, in case
// an event handler is removed between now and then.
Action<T> handler = m_handler;
EventHandler<T> changedEvent = ProgressChanged;
if (handler != null || changedEvent != null)
{
// Post the processing to the [....] context.
// Post the processing to the sync context.
// (If T is a value type, it will get boxed here.)
m_synchronizationContext.Post(m_invokeHandlers, value);
}