72 lines
2.2 KiB
Plaintext
72 lines
2.2 KiB
Plaintext
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: TulipEventRelay.sg
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//
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//
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// Note: Right now this interface waits for acks from the receiver.
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// This adds an unnecessary context switch. At some future point
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// we may be able to have something more akin to a one-way single
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// buffer-slot notification system, but for now we ack.
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using Microsoft.SingSharp;
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using Microsoft.Singularity;
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using Microsoft.Singularity.Channels;
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using Microsoft.Singularity.Io;
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using Microsoft.Singularity.Io.Net;
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using Microsoft.Singularity.Directory;
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using Microsoft.Singularity.V1.Services;
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using System;
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using System.Threading;
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namespace Microsoft.Singularity.Drivers.Network.Tulip
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{
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internal struct TulipEvent
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{
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internal const uint NoEvent = (uint) NicEventType.NoEvent;
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internal const uint ReceiveEvent = (uint) NicEventType.ReceiveEvent;
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internal const uint TransmitEvent = (uint) NicEventType.TransmitEvent;
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internal const uint LinkEvent = (uint) NicEventType.LinkEvent;
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}
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internal class TulipEventRelay
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{
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TRef<NicDeviceEventContract.Exp:RUNNING>! channel;
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bool channelClosed;
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internal TulipEventRelay([Claims]
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NicDeviceEventContract.Exp:READY! ep)
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{
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channel = new TRef<NicDeviceEventContract.Exp:RUNNING>(ep);
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channelClosed = false;
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}
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internal void ForwardEvent(uint tulipEvent)
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{
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if (channelClosed)
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{
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return;
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}
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NicDeviceEventContract.Exp! exp = channel.Acquire();
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exp.SendNicDeviceEvent((NicEventType)tulipEvent);
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try
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{
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exp.RecvAckNicDeviceEvent();
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}
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catch (ChannelClosedException)
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{
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channelClosed = true;
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}
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finally
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{
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channel.Release(exp);
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}
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}
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}
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}
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