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//
// System.Threading.Monitor.cs
//
// Author:
// Dick Porter (dick@ximian.com)
//
// (C) Ximian, Inc. http://www.ximian.com
//
using System.Runtime.CompilerServices;
namespace System.Threading
{
public sealed class Monitor
{
private 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);
public static void Enter(object obj) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
//if(obj.GetType().IsValueType==true) {
// throw new ArgumentException("Value type");
//}
Monitor_try_enter(obj, Timeout.Infinite);
}
// Releases the mutex on object 'obj'
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static void Monitor_exit(object obj);
// Checks whether the current thread currently owns
// the lock on object 'obj'
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool Monitor_test_owner(object obj);
public static void Exit(object obj) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
//if(obj.GetType().IsValueType==true) {
// throw new ArgumentException("Value type");
//}
if(Monitor_test_owner(obj)==false) {
throw new SynchronizationLockException("The current thread does not own the lock");
}
Monitor_exit(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("Object is null");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronised");
}
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("Object is null");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronised");
}
Monitor_pulse_all(obj);
}
public static bool TryEnter(object obj) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
//if(obj.GetType().IsValueType==true) {
// throw new ArgumentException("Value type");
//}
return(Monitor_try_enter(obj, 0));
}
public static bool TryEnter(object obj, int millisecondsTimeout) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
//if(obj.GetType().IsValueType==true) {
// throw new ArgumentException("Value type");
//}
// LAMESPEC: should throw an exception when ms<0, but
// Timeout.Infinite is -1
if(millisecondsTimeout == Timeout.Infinite) {
Enter(obj);
return(true);
}
if(millisecondsTimeout<0) {
throw new ArgumentException("millisecondsTimeout negative");
}
return(Monitor_try_enter(obj, millisecondsTimeout));
}
public static bool TryEnter(object obj, TimeSpan timeout) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
//if(obj.GetType().IsValueType==true) {
// throw new ArgumentException("Value type");
//}
// LAMESPEC: should throw an exception when ms<0, but
// Timeout.Infinite is -1
if(timeout.Milliseconds == Timeout.Infinite) {
Enter(obj);
return(true);
}
if(timeout.Milliseconds < 0 ||
timeout.Milliseconds > Int32.MaxValue) {
throw new ArgumentOutOfRangeException("timeout out of range");
}
return(Monitor_try_enter(obj, timeout.Milliseconds));
}
// 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) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronised");
}
return(Monitor_wait(obj, 0));
}
public static bool Wait(object obj, int millisecondsTimeout) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronised");
}
// LAMESPEC: no mention of timeout sanity checking
return(Monitor_wait(obj, millisecondsTimeout));
}
public static bool Wait(object obj, TimeSpan timeout) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
// LAMESPEC: says to throw ArgumentException too
if(timeout.Milliseconds < 0 || timeout.Milliseconds > Int32.MaxValue) {
throw new ArgumentOutOfRangeException("timeout out of range");
}
if(Monitor_test_synchronised(obj)==false) {
throw new SynchronizationLockException("Object is not synchronised");
}
return(Monitor_wait(obj, timeout.Milliseconds));
}
[MonoTODO]
public static bool Wait(object obj, int millisecondsTimeout, bool exitContext) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
// FIXME when I understand what a
// "synchronisation domain" is and does
return(false);
}
[MonoTODO]
public static bool Wait(object obj, TimeSpan timeout, bool exitContext) {
if(obj==null) {
throw new ArgumentNullException("Object is null");
}
// LAMESPEC: says to throw ArgumentException too
if(timeout.Milliseconds < 0 || timeout.Milliseconds > Int32.MaxValue) {
throw new ArgumentOutOfRangeException("timeout out of range");
}
// FIXME when I understand what a
// "synchronisation domain" is and does
return(false);
}
}
}
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