Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Threading / Monitor.cs / 1 / 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; [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. =========================================================================*/ [MethodImplAttribute(MethodImplOptions.InternalCall)] public static extern void Enter(Object obj); // This should be made public in a future version. // 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. [MethodImplAttribute(MethodImplOptions.InternalCall)] internal static extern void ReliableEnter(Object obj, ref bool tookLock); /*========================================================================= ** 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. =========================================================================*/ [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) { return TryEnterTimeout(obj, 0); } /*========================================================================== ** 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) { return TryEnterTimeout(obj, millisecondsTimeout); } public static bool TryEnter(Object obj, TimeSpan timeout) { long tm = (long)timeout.TotalMilliseconds; if (tm < -1 || tm > (long) Int32.MaxValue) throw new ArgumentOutOfRangeException("timeout", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegOrNegative1")); return TryEnterTimeout(obj, (int)tm); } [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern bool TryEnterTimeout(Object obj, int timeout); /*======================================================================= ** 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. ========================================================================*/ [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern bool ObjWait(bool exitContext, int millisecondsTimeout,Object obj); 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) { long tm = (long)timeout.TotalMilliseconds; if (tm < -1 || tm > (long) Int32.MaxValue) throw new ArgumentOutOfRangeException("timeout", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegOrNegative1")); return Wait(obj, (int)tm, exitContext); } public static bool Wait(Object obj, int millisecondsTimeout) { return Wait(obj,millisecondsTimeout,false); } public static bool Wait(Object obj, TimeSpan timeout) { long tm = (long)timeout.TotalMilliseconds; if (tm < -1 || tm > (long) Int32.MaxValue) throw new ArgumentOutOfRangeException("timeout", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegOrNegative1")); return Wait(obj,(int)tm,false); } 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. ========================================================================*/ [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void ObjPulse(Object obj); public static void Pulse(Object obj) { if (obj==null) { throw new ArgumentNullException("obj"); } ObjPulse(obj); } /*======================================================================== ** Sends a notification to all waiting objects. ========================================================================*/ [MethodImplAttribute(MethodImplOptions.InternalCall)] private static extern void ObjPulseAll(Object obj); public static void PulseAll(Object obj) { if (obj==null) { throw new ArgumentNullException("obj"); } ObjPulseAll(obj); } } }
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