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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.
/*============================================================
**
**
**
** Purpose: Capture synchronization semantics for asynchronous callbacks
**
**
===========================================================*/
using Internal.Runtime.Augments;
namespace System.Threading
{
[Flags]
internal enum SynchronizationContextProperties
{
None = 0,
RequireWaitNotification = 0x1
};
public partial class SynchronizationContext
{
private SynchronizationContextProperties _props = SynchronizationContextProperties.None;
public SynchronizationContext()
{
}
#if PLATFORM_WINDOWS
// protected so that only the derived sync context class can enable these flags
protected void SetWaitNotificationRequired()
{
_props |= SynchronizationContextProperties.RequireWaitNotification;
}
#endif
public bool IsWaitNotificationRequired()
{
return ((_props & SynchronizationContextProperties.RequireWaitNotification) != 0);
}
public virtual void Send(SendOrPostCallback d, Object state)
{
d(state);
}
public virtual void Post(SendOrPostCallback d, Object state)
{
ThreadPool.QueueUserWorkItem(new WaitCallback(d), state);
}
/// <summary>
/// Optional override for subclasses, for responding to notification that operation is starting.
/// </summary>
public virtual void OperationStarted()
{
}
/// <summary>
/// Optional override for subclasses, for responding to notification that operation has completed.
/// </summary>
public virtual void OperationCompleted()
{
}
#if PLATFORM_WINDOWS
// Method called when the CLR does a wait operation
[CLSCompliant(false)]
public virtual int Wait(IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout)
{
return WaitHelper(waitHandles, waitAll, millisecondsTimeout);
}
// Method that can be called by Wait overrides
[CLSCompliant(false)]
protected static int WaitHelper(IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout)
{
if (waitHandles == null)
{
throw new ArgumentNullException(nameof(waitHandles));
}
return WaitHandle.WaitForMultipleObjectsIgnoringSyncContext(waitHandles, waitHandles.Length, waitAll, millisecondsTimeout);
}
#endif
// Set the SynchronizationContext on the current thread
public static void SetSynchronizationContext(SynchronizationContext syncContext)
{
RuntimeThread.CurrentThread.SynchronizationContext = syncContext;
}
internal static SynchronizationContext CurrentExplicit
{
get
{
return RuntimeThread.CurrentThread.SynchronizationContext;
}
}
// helper to Clone this SynchronizationContext,
public virtual SynchronizationContext CreateCopy()
{
// the CLR dummy has an empty clone function - no member data
return new SynchronizationContext();
}
}
}
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