Interlocked.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Threading / Interlocked.cs / 1 / Interlocked.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
namespace System.Threading {
    using System; 
    using System.Security.Permissions; 
    using System.Runtime.CompilerServices;
    using System.Runtime.ConstrainedExecution; 

    // After much discussion, we decided the Interlocked class doesn't need
    // any HPA's for synchronization or external threading.  They hurt C#'s
    // codegen for the yield keyword, and arguably they didn't protect much. 
    // Instead, they penalized people (and compilers) for writing threadsafe
    // code. 
    public static class Interlocked 
    {
        /****************************** 
         * Increment
         *   Implemented: int
         *                        long
         *****************************/ 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        public static extern int Increment(ref int location);
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        public static extern long Increment(ref long location);

        /****************************** 
         * Decrement
         *   Implemented: int 
         *                        long 
         *****************************/
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        public static extern int Decrement(ref int location);
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        public static extern long Decrement(ref long location); 
 
        /******************************
         * Exchange 
         *   Implemented: int
         *                        long
         *                        float
         *                        double 
         *                        Object
         *                        IntPtr 
         *****************************/ 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        public static extern int Exchange(ref int location1, int value);

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        public static extern long Exchange(ref long location1, long value);
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        public static extern float Exchange(ref float location1, float value);
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        public static extern double Exchange(ref double location1, double value);

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        public static extern Object Exchange(ref Object location1, Object value); 
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        public static extern IntPtr Exchange(ref IntPtr location1, IntPtr value);

        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [System.Runtime.InteropServices.ComVisible(false)] 
        public static T Exchange(ref T location1, T value) where T : class
        { 
            _Exchange(__makeref(location1), __makeref(value)); 
            //Since value is a local we use trash its data on return
            //  The Exchange replaces the data with new data 
            //  so after the return "value" contains the original location1
            //See ExchangeGeneric for more details
            return value;
        } 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        private static extern void _Exchange(TypedReference location1, TypedReference value);
 
        /******************************
         * CompareExchange
         *    Implemented: int
         *                         long 
         *                         float
         *                         double 
         *                         Object 
         *                         IntPtr
         *****************************/ 

        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        public static extern int CompareExchange(ref int location1, int value, int comparand); 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        public static extern long CompareExchange(ref long location1, long value, long comparand); 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        public static extern float CompareExchange(ref float location1, float value, float comparand);

        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        public static extern double CompareExchange(ref double location1, double value, double comparand); 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        public static extern Object CompareExchange(ref Object location1, Object value, Object comparand);
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        public static extern IntPtr CompareExchange(ref IntPtr location1, IntPtr value, IntPtr comparand);
 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [System.Runtime.InteropServices.ComVisible(false)] 
        public static T CompareExchange(ref T location1, T value, T comparand) where T : class 
        {
            _CompareExchange(__makeref(location1), __makeref(value), comparand); 
            //Since value is a local we use trash its data on return
            //  The Exchange replaces the data with new data
            //  so after the return "value" contains the original location1
            //See CompareExchangeGeneric for more details 
            return value;
        } 
 
        [MethodImplAttribute(MethodImplOptions.InternalCall)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        private static extern void _CompareExchange(TypedReference location1, TypedReference value, Object comparand);

        /******************************
         * Add 
         *    Implemented: int
         *                         long 
         *****************************/ 

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        internal static extern int ExchangeAdd(ref int location1, int value);

        [MethodImplAttribute(MethodImplOptions.InternalCall)] 
        internal static extern long ExchangeAdd(ref long location1, long value);
 
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        public static int Add(ref int location1, int value)
        { 
            return ExchangeAdd(ref location1, value) + value;
        }

 	 [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
        public static long Add(ref long location1, long value)
        { 
            return ExchangeAdd(ref location1, value) + value; 
        }
	 
        /******************************
         * Read
         *****************************/
 
        public static long Read(ref long location)
        { 
            return Interlocked.CompareExchange(ref location,0,0); 
        }
    } 
}

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