//
// System.Threading.Monitor.cs
//
// Author:
// Dick Porter (dick@ximian.com)
//
// (C) Ximian, Inc. http://www.ximian.com
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Runtime.CompilerServices;
using System.Runtime.Remoting.Contexts;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
namespace System.Threading{
[ComVisible (true)]
public static class Monitor
{
// Grabs the mutex on object 'obj', with a maximum
// wait time 'ms' but doesn't block - if it can't get
// the lock it returns false, true if it can
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool Monitor_try_enter(object obj, int ms);
// Enter/Exit are implemented directly as icalls for performance reasons
// Acquires the mutex on object 'obj'
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public extern static void Enter(object obj);
// Releases the mutex on object 'obj'
[ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public extern static void Exit(object obj);
// Signals one of potentially many objects waiting on
// object 'obj'
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static void Monitor_pulse(object obj);
// Checks whether object 'obj' is currently synchronised
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool Monitor_test_synchronised(object obj);
public static void Pulse(object obj) {
if(obj==null) {
throw new ArgumentNullException("obj");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronized");
}
Monitor_pulse(obj);
}
// Signals all of potentially many objects waiting on
// object 'obj'
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static void Monitor_pulse_all(object obj);
public static void PulseAll(object obj) {
if(obj==null) {
throw new ArgumentNullException("obj");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronized");
}
Monitor_pulse_all(obj);
}
public static bool TryEnter (object obj)
{
return TryEnter (obj, 0);
}
public static bool TryEnter (object obj, int millisecondsTimeout)
{
if (obj == null)
throw new ArgumentNullException ("obj");
if (millisecondsTimeout == Timeout.Infinite) {
Enter (obj);
return true;
}
if (millisecondsTimeout < 0)
throw new ArgumentException ("negative value for millisecondsTimeout", "millisecondsTimeout");
return Monitor_try_enter (obj, millisecondsTimeout);
}
public static bool TryEnter (object obj, TimeSpan timeout)
{
long ms = (long) timeout.TotalMilliseconds;
if (ms < Timeout.Infinite || ms > Int32.MaxValue)
throw new ArgumentOutOfRangeException ("timeout", "timeout out of range");
return TryEnter (obj, (int) ms);
}
// Waits for a signal on object 'obj' with maximum
// wait time 'ms'. Returns true if the object was
// signalled, false if it timed out
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool Monitor_wait(object obj, int ms);
public static bool Wait (object obj)
{
return Wait (obj, Timeout.Infinite);
}
public static bool Wait (object obj, int millisecondsTimeout)
{
if (obj == null)
throw new ArgumentNullException ("obj");
if (millisecondsTimeout < Timeout.Infinite)
throw new ArgumentOutOfRangeException ("millisecondsTimeout", "timeout out of range");
if (!Monitor_test_synchronised (obj))
throw new SynchronizationLockException ("Object is not synchronized");
return Monitor_wait (obj, millisecondsTimeout);
}
public static bool Wait (object obj, TimeSpan timeout)
{
long ms = (long) timeout.TotalMilliseconds;
if (ms < Timeout.Infinite || ms > Int32.MaxValue)
throw new ArgumentOutOfRangeException ("timeout", "timeout out of range");
return Wait (obj, (int) ms);
}
public static bool Wait(object obj, int millisecondsTimeout, bool exitContext) {
try {
if (exitContext) SynchronizationAttribute.ExitContext ();
return Wait (obj, millisecondsTimeout);
}
finally {
if (exitContext) SynchronizationAttribute.EnterContext ();
}
}
public static bool Wait(object obj, TimeSpan timeout, bool exitContext) {
try {
if (exitContext) SynchronizationAttribute.ExitContext ();
return Wait (obj, timeout);
}
finally {
if (exitContext) SynchronizationAttribute.EnterContext ();
}
}
#if NET_4_0 || MOONLIGHT
public static void Enter (object obj, ref bool lockTaken)
{
if (obj == null)
throw new ArgumentNullException ("obj");
if (lockTaken)
throw new ArgumentException ("lockTaken");
Enter (obj);
// if Enter throws then lockTaken will be false
lockTaken = true;
}
#endif
}
}
|