// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// A helper class for firing ETW events related to the Coordination Data Structure
// sync primitives. This provider is used by CDS sync primitives in both mscorlib.dll
// and system.dll. The purpose of sharing the provider class is to be able to enable
// ETW tracing on all CDS sync types with a single ETW provider GUID, and to minimize
// the number of providers in use.
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.Tracing;
using System.Security;
using System.Text;
 
namespace System.Threading
{
    /// <summary>Provides an event source for tracing CDS synchronization information.</summary>
    [EventSource(
        Name = "System.Threading.SynchronizationEventSource",
        Guid = "EC631D38-466B-4290-9306-834971BA0217"
        )]
    internal sealed class CdsSyncEtwBCLProvider : EventSource
    {
        /// <summary>
        /// Defines the singleton instance for the CDS Sync ETW provider.
        /// The CDS Sync Event provider GUID is {EC631D38-466B-4290-9306-834971BA0217}.
        /// </summary>
        public static readonly CdsSyncEtwBCLProvider Log = new CdsSyncEtwBCLProvider();
        /// <summary>Prevent external instantiation.  All logging should go through the Log instance.</summary>
        private CdsSyncEtwBCLProvider() { }
 
        /// <summary>Enabled for all keywords.</summary>
        private const EventKeywords ALL_KEYWORDS = (EventKeywords)(-1);
 
        //-----------------------------------------------------------------------------------
        //
        // CDS Synchronization Event IDs (must be unique)
        //
 
        private const int BARRIER_PHASEFINISHED_ID = 3;
 
 
        //
        // Events below this point are used by the CDS types in System.dll
        //
 
        /////////////////////////////////////////////////////////////////////////////////////
        //
        // Barrier Events
        //
 
        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
                   Justification = "Parameters to this method are primitive and are trimmer safe")]
        [Event(BARRIER_PHASEFINISHED_ID, Level = EventLevel.Verbose, Version = 1)]
        public void Barrier_PhaseFinished(bool currentSense, long phaseNum)
        {
            if (IsEnabled(EventLevel.Verbose, ALL_KEYWORDS))
            {
                // WriteEvent(BARRIER_PHASEFINISHED_ID, currentSense, phaseNum);
 
                // There is no explicit WriteEvent() overload matching this event's bool+long fields.
                // Therefore calling WriteEvent() would hit the "params" overload, which leads to an
                // object allocation every time this event is fired. To prevent that problem we will
                // call WriteEventCore(), which works with a stack based EventData array populated with
                // the event fields.
                unsafe
                {
                    EventData* eventPayload = stackalloc EventData[2];
 
                    int senseAsInt32 = currentSense ? 1 : 0; // write out Boolean as Int32
                    eventPayload[0] = new EventData
                    {
                        Size = sizeof(int),
                        DataPointer = ((IntPtr)(&senseAsInt32))
                    };
                    eventPayload[1] = new EventData
                    {
                        Size = sizeof(long),
                        DataPointer = ((IntPtr)(&phaseNum))
                    };
 
                    WriteEventCore(BARRIER_PHASEFINISHED_ID, 2, eventPayload);
                }
            }
        }
    }
}