Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Threading / Monitor.cs / 1305376 / Monitor.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // //[....] /*============================================================================== ** ** Class: Monitor ** ** ** Purpose: Synchronizes access to a shared resource or region of code in a multi-threaded ** program. ** ** =============================================================================*/ namespace System.Threading { using System; using System.Security.Permissions; using System.Runtime.Remoting; using System.Threading; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; using System.Runtime.Versioning; using System.Diagnostics.Contracts; [HostProtection(Synchronization=true, ExternalThreading=true)] [System.Runtime.InteropServices.ComVisible(true)] public static class Monitor { /*========================================================================= ** Obtain the monitor lock of obj. Will block if another thread holds the lock ** Will not block if the current thread holds the lock, ** however the caller must ensure that the same number of Exit ** calls are made as there were Enter calls. ** ** Exceptions: ArgumentNullException if object is null. =========================================================================*/ // // Can't obsolete this for CoreCLR yet - Silverlight still uses an old C# compiler would issue a warning for every lock // statement. We can remove this #ifdef once SL picks up the new compiler. This is Dev10 bug 674483. // [System.Security.SecuritySafeCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] public static extern void Enter(Object obj); // Use a ref bool instead of out to ensure that unverifiable code must // initialize this value to something. If we used out, the value // could be uninitialized if we threw an exception in our prolog. [System.Security.SecuritySafeCritical] // auto-generated public static void Enter(Object obj, ref bool lockTaken) { if (lockTaken) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeFalse"), "lockTaken"); ReliableEnter(obj, ref lockTaken); Contract.Assert(lockTaken); } [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void ReliableEnter(Object obj, ref bool lockTaken); /*========================================================================= ** Release the monitor lock. If one or more threads are waiting to acquire the ** lock, and the current thread has executed as many Exits as ** Enters, one of the threads will be unblocked and allowed to proceed. ** ** Exceptions: ArgumentNullException if object is null. ** SynchronizationLockException if the current thread does not ** own the lock. =========================================================================*/ [System.Security.SecuritySafeCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] public static extern void Exit(Object obj); /*========================================================================= ** Similar to Enter, but will never block. That is, if the current thread can ** acquire the monitor lock without blocking, it will do so and TRUE will ** be returned. Otherwise FALSE will be returned. ** ** Exceptions: ArgumentNullException if object is null. =========================================================================*/ public static bool TryEnter(Object obj) { bool lockTaken = false; TryEnter(obj, 0, ref lockTaken); return lockTaken; } [System.Security.SecuritySafeCritical] // auto-generated public static void TryEnter(Object obj, ref bool lockTaken) { if (lockTaken) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeFalse"), "lockTaken"); ReliableEnterTimeout(obj, 0, ref lockTaken); } /*========================================================================== ** Version of TryEnter that will block, but only up to a timeout period ** expressed in milliseconds. If timeout == Timeout.Infinite the method ** becomes equivalent to Enter. ** ** Exceptions: ArgumentNullException if object is null. ** ArgumentException if timeout < 0. =========================================================================*/ public static bool TryEnter(Object obj, int millisecondsTimeout) { bool lockTaken = false; TryEnter(obj, millisecondsTimeout, ref lockTaken); return lockTaken; } private static int MillisecondsTimeoutFromTimeSpan(TimeSpan timeout) { long tm = (long)timeout.TotalMilliseconds; if (tm < -1 || tm > (long)Int32.MaxValue) throw new ArgumentOutOfRangeException("timeout", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegOrNegative1")); return (int)tm; } public static bool TryEnter(Object obj, TimeSpan timeout) { return TryEnter(obj, MillisecondsTimeoutFromTimeSpan(timeout)); } [System.Security.SecuritySafeCritical] // auto-generated public static void TryEnter(Object obj, int millisecondsTimeout, ref bool lockTaken) { if (lockTaken) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeFalse"), "lockTaken"); ReliableEnterTimeout(obj, millisecondsTimeout, ref lockTaken); } [System.Security.SecuritySafeCritical] // auto-generated public static void TryEnter(Object obj, TimeSpan timeout, ref bool lockTaken) { if (lockTaken) throw new ArgumentException(Environment.GetResourceString("Argument_MustBeFalse"), "lockTaken"); ReliableEnterTimeout(obj, MillisecondsTimeoutFromTimeSpan(timeout), ref lockTaken); } [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void ReliableEnterTimeout(Object obj, int timeout, ref bool lockTaken); /*======================================================================= ** Waits for notification from the object (via a Pulse/PulseAll). ** timeout indicates how long to wait before the method returns. ** This method acquires the monitor waithandle for the object ** If this thread holds the monitor lock for the object, it releases it. ** On exit from the method, it obtains the monitor lock back. ** If exitContext is true then the synchronization domain for the context ** (if in a synchronized context) is exited before the wait and reacquired ** ** Exceptions: ArgumentNullException if object is null. ========================================================================*/ [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern bool ObjWait(bool exitContext, int millisecondsTimeout, Object obj); [System.Security.SecuritySafeCritical] // auto-generated public static bool Wait(Object obj, int millisecondsTimeout, bool exitContext) { if (obj == null) throw (new ArgumentNullException("obj")); return ObjWait(exitContext, millisecondsTimeout, obj); } public static bool Wait(Object obj, TimeSpan timeout, bool exitContext) { return Wait(obj, MillisecondsTimeoutFromTimeSpan(timeout), exitContext); } [System.Security.SecuritySafeCritical] // auto-generated public static bool Wait(Object obj, int millisecondsTimeout) { return Wait(obj, millisecondsTimeout, false); } [System.Security.SecuritySafeCritical] // auto-generated public static bool Wait(Object obj, TimeSpan timeout) { return Wait(obj, MillisecondsTimeoutFromTimeSpan(timeout), false); } [System.Security.SecuritySafeCritical] // auto-generated public static bool Wait(Object obj) { return Wait(obj, Timeout.Infinite, false); } /*======================================================================== ** Sends a notification to a single waiting object. * Exceptions: SynchronizationLockException if this method is not called inside * a synchronized block of code. ========================================================================*/ [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void ObjPulse(Object obj); [System.Security.SecuritySafeCritical] // auto-generated public static void Pulse(Object obj) { if (obj == null) { throw new ArgumentNullException("obj"); } Contract.EndContractBlock(); ObjPulse(obj); } /*======================================================================== ** Sends a notification to all waiting objects. ========================================================================*/ [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void ObjPulseAll(Object obj); [System.Security.SecuritySafeCritical] // auto-generated public static void PulseAll(Object obj) { if (obj == null) { throw new ArgumentNullException("obj"); } Contract.EndContractBlock(); ObjPulseAll(obj); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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