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#if NET_4_0
//
// Barrier.cs
//
// Author:
// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
//
// Copyright (c) 2009 Jérémie "Garuma" Laval
//
// 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;
namespace System.Threading
{
public class Barrier
{
readonly Action<Barrier> postPhaseAction;
int participants;
CountdownEvent cntd;
AtomicBoolean cleaned = new AtomicBoolean ();
int phase;
public Barrier (int participants) : this (participants, null)
{
}
public Barrier (int participants, Action<Barrier> postPhaseAction)
{
this.participants = participants;
this.postPhaseAction = postPhaseAction;
InitCountdownEvent ();
}
void InitCountdownEvent ()
{
cleaned = new AtomicBoolean ();
cntd = new CountdownEvent (participants);
}
public int AddParticipant ()
{
return AddParticipants (1);
}
public int AddParticipants (int participantCount)
{
// Basically, we try to add ourselves and return
// the phase. If the call return false, we repeatdly try
// to add ourselves for the next phase
do {
if (cntd.TryAddCount (participantCount)) {
Interlocked.Add (ref participants, participantCount);
return phase;
}
} while (true);
}
public void RemoveParticipant ()
{
RemoveParticipants (1);
}
public void RemoveParticipants (int participantCount)
{
if (cntd.Signal (participantCount))
PostPhaseAction (cleaned);
Interlocked.Add (ref participants, -participantCount);
}
public void SignalAndWait ()
{
SignalAndWait ((c) => { c.Wait (); return true; });
}
public bool SignalAndWait (int millisecondTimeout)
{
return SignalAndWait ((c) => c.Wait (millisecondTimeout));
}
public bool SignalAndWait (TimeSpan ts)
{
return SignalAndWait ((c) => c.Wait (ts));
}
public bool SignalAndWait (int millisecondTimeout, CancellationToken token)
{
return SignalAndWait ((c) => c.Wait (millisecondTimeout, token));
}
public bool SignalAndWait (TimeSpan ts, CancellationToken token)
{
return SignalAndWait ((c) => c.Wait (ts, token));
}
bool SignalAndWait (Func<CountdownEvent, bool> associate)
{
bool result;
AtomicBoolean cl = cleaned;
CountdownEvent temp = cntd;
if (!temp.Signal ()) {
result = Wait (associate, temp, cl);
} else {
result = true;
PostPhaseAction (cl);
}
return result;
}
bool Wait (Func<CountdownEvent, bool> associate, CountdownEvent temp, AtomicBoolean cl)
{
if (!associate (temp))
return false;
SpinWait sw = new SpinWait ();
while (!cl.Value) {
//Console.WriteLine (cleaned);
sw.SpinOnce ();
}
return true;
}
void PostPhaseAction (AtomicBoolean cl)
{
if (postPhaseAction != null)
postPhaseAction (this);
InitCountdownEvent ();
cl.Value = true;
phase++;
}
public int CurrentPhaseNumber {
get {
return phase;
}
}
public int ParticipantCount {
get {
return participants;
}
}
}
}
#endif
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