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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if !NO_THREAD
using System;
using System.Collections.Generic;
using System.Reactive.Disposables;
using System.Threading;
namespace System.Reactive.Concurrency
{
//
// WARNING: This code is kept *identically* in two places. One copy is kept in System.Reactive.Core for non-PLIB platforms.
// Another copy is kept in System.Reactive.PlatformServices to enlighten the default lowest common denominator
// behavior of Rx for PLIB when used on a more capable platform.
//
internal class /*Default*/ConcurrencyAbstractionLayerImpl : IConcurrencyAbstractionLayer
{
public IDisposable StartTimer(Action<object> action, object state, TimeSpan dueTime)
{
return new Timer(action, state, Normalize(dueTime));
}
public IDisposable StartPeriodicTimer(Action action, TimeSpan period)
{
//
// MSDN documentation states the following:
//
// "If period is zero (0) or negative one (-1) milliseconds and dueTime is positive, callback is invoked once;
// the periodic behavior of the timer is disabled, but can be re-enabled using the Change method."
//
if (period <= TimeSpan.Zero)
throw new ArgumentOutOfRangeException("period");
return new PeriodicTimer(action, period);
}
public IDisposable QueueUserWorkItem(Action<object> action, object state)
{
System.Threading.ThreadPool.QueueUserWorkItem(_ => action(_), state);
return Disposable.Empty;
}
#if USE_SLEEP_MS
public void Sleep(TimeSpan timeout)
{
System.Threading.Thread.Sleep((int)Normalize(timeout).TotalMilliseconds);
}
#else
public void Sleep(TimeSpan timeout)
{
System.Threading.Thread.Sleep(Normalize(timeout));
}
#endif
public IStopwatch StartStopwatch()
{
#if !NO_STOPWATCH
return new StopwatchImpl();
#else
return new DefaultStopwatch();
#endif
}
public bool SupportsLongRunning
{
get { return true; }
}
public void StartThread(Action<object> action, object state)
{
new Thread(() =>
{
action(state);
}).Start();
}
private static TimeSpan Normalize(TimeSpan dueTime)
{
if (dueTime < TimeSpan.Zero)
return TimeSpan.Zero;
return dueTime;
}
class Timer : IDisposable
{
//
// Note: the dictionary exists to "root" the timers so that they are not garbage collected and finalized while they are running.
//
#if !NO_HASHSET
private static readonly HashSet<System.Threading.Timer> s_timers = new HashSet<System.Threading.Timer>();
#else
private static readonly Dictionary<System.Threading.Timer, object> s_timers = new Dictionary<System.Threading.Timer, object>();
#endif
private Action<object> _action;
private System.Threading.Timer _timer;
private bool _hasAdded;
private bool _hasRemoved;
public Timer(Action<object> action, object state, TimeSpan dueTime)
{
_action = action;
_timer = new System.Threading.Timer(Tick, state, dueTime, TimeSpan.FromMilliseconds(System.Threading.Timeout.Infinite));
lock (s_timers)
{
if (!_hasRemoved)
{
#if !NO_HASHSET
s_timers.Add(_timer);
#else
s_timers.Add(_timer, null);
#endif
_hasAdded = true;
}
}
}
private void Tick(object state)
{
try
{
_action(state);
}
finally
{
Dispose();
}
}
public void Dispose()
{
_action = Stubs<object>.Ignore;
var timer = default(System.Threading.Timer);
lock (s_timers)
{
if (!_hasRemoved)
{
timer = _timer;
_timer = null;
if (_hasAdded && timer != null)
s_timers.Remove(timer);
_hasRemoved = true;
}
}
if (timer != null)
timer.Dispose();
}
}
class PeriodicTimer : IDisposable
{
//
// Note: the dictionary exists to "root" the timers so that they are not garbage collected and finalized while they are running.
//
#if !NO_HASHSET
private static readonly HashSet<System.Threading.Timer> s_timers = new HashSet<System.Threading.Timer>();
#else
private static readonly Dictionary<System.Threading.Timer, object> s_timers = new Dictionary<System.Threading.Timer, object>();
#endif
private Action _action;
private System.Threading.Timer _timer;
public PeriodicTimer(Action action, TimeSpan period)
{
_action = action;
_timer = new System.Threading.Timer(Tick, null, period, period);
lock (s_timers)
{
#if !NO_HASHSET
s_timers.Add(_timer);
#else
s_timers.Add(_timer, null);
#endif
}
}
private void Tick(object state)
{
_action();
}
public void Dispose()
{
var timer = default(System.Threading.Timer);
lock (s_timers)
{
timer = _timer;
_timer = null;
if (timer != null)
s_timers.Remove(timer);
}
if (timer != null)
{
timer.Dispose();
_action = Stubs.Nop;
}
}
}
}
}
#endif
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