Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Sys / System / Threading / Barrier.cs / 1305376 / Barrier.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
//
// Barrier.cs
//
// [....]
//
// A barrier allows multiple tasks to cooperatively work on some algorithm in parallel.
// A group of tasks cooperate by moving through a series of phases, where each in the group signals it has arrived at
// the barrier in a given phase and implicitly waits for all others to arrive.
// The same barrier can be used for multiple phases.
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Threading;
using System.Runtime.Serialization;
using System.Security;
namespace System.Threading
{
///
/// The exception that is thrown when the post-phase action of a
[Serializable]
public class BarrierPostPhaseException : Exception
{
///
/// Initializes a new instance of the
public BarrierPostPhaseException():this((string)null)
{
}
///
/// Initializes a new instance of the
/// The exception that is the cause of the current exception.
public BarrierPostPhaseException(Exception innerException): this(null, innerException)
{
}
///
/// Initializes a new instance of the
/// A string that describes the exception.
public BarrierPostPhaseException(string message):this(message, null)
{
}
///
/// Initializes a new instance of the
/// A string that describes the exception.
/// The exception that is the cause of the current exception.
public BarrierPostPhaseException(string message, Exception innerException)
: base(message == null ? SR.GetString(SR.BarrierPostPhaseException) : message, innerException)
{
}
///
/// Initializes a new instance of the
/// The object that holds the serialized object data.
/// An object that describes the source or destination of the serialized data.
[SecurityCritical]
protected BarrierPostPhaseException(SerializationInfo info, StreamingContext context)
: base(info, context)
{
}
}
///
/// Enables multiple tasks to cooperatively work on an algorithm in parallel through multiple phases.
///
///
///
/// A group of tasks cooperate by moving through a series of phases, where each in the group signals it
/// has arrived at the
///
/// All public and protected members of
///
[ComVisible(false)]
[HostProtection(SecurityAction.LinkDemand, Synchronization = true, ExternalThreading = true)]
[DebuggerDisplay("Participant Count={ParticipantCount},Participants Remaining={ParticipantsRemaining}")]
public class Barrier : IDisposable
{
//This variable holds the basic barrier variables:
// 1- The current particiants count
// 2- The total participants count
// 3- The sense flag (true if the cuurrent phase is even, false otherwise)
// The first 15 bits are for the total count which means the maximum participants for the barrier is about 32K
// The 16th bit is dummy
// The next 15th bit for the current
// And the last highest bit is for the sense
volatile int m_currentTotalCount;
// Bitmask to extract the current count
const int CURRENT_MASK = 0x7FFF0000;
// Bitmask to extract the total count
const int TOTAL_MASK = 0x00007FFF;
// Bitmask to extratc the sense flag
const int SENSE_MASK = unchecked((int)0x80000000);
// The maximum participants the barrier can operate = 32767 ( 2 power 15 - 1 )
const int MAX_PARTICIPANTS = TOTAL_MASK;
// The current barrier phase
// We don't need to worry about overflow, the max value is 2^63-1; If it starts from 0 at a
// rate of 4 billion increments per second, it will takes about 64 years to overflow.
long m_currentPhase;
// dispose flag
bool m_disposed;
// Odd phases event
ManualResetEventSlim m_oddEvent;
// Even phases event
ManualResetEventSlim m_evenEvent;
// The execution context of the creator thread
ExecutionContext m_ownerThreadContext;
// Post phase action after each phase
Action m_postPhaseAction;
// In case the post phase action throws an exception, wraps it in BarrierPostPhaseException
Exception m_exception;
// This is the ManagedThreadID of the postPhaseAction caller thread, this is used to determine if the SignalAndWait, Dispose or Add/RemoveParticipant caller thread is
// the same thread as the postPhaseAction thread which means this method was called from the postPhaseAction which is illegal.
// This value is captured before calling the action and reset back to zero after it.
int m_actionCallerID;
#region Properties
///
/// Gets the number of participants in the barrier that haven’t yet signaled
/// in the current phase.
///
///
/// This could be 0 during a post-phase action delegate execution or if the
/// ParticipantCount is 0.
///
public int ParticipantsRemaining
{
get
{
int currentTotal = m_currentTotalCount;
int total = (int)(currentTotal & TOTAL_MASK);
int current = (int)((currentTotal & CURRENT_MASK) >> 16);
return total - current;
}
}
///
/// Gets the total number of participants in the barrier.
///
public int ParticipantCount
{
get { return (int)(m_currentTotalCount & TOTAL_MASK); }
}
///
/// Gets the number of the barrier's current phase.
///
public long CurrentPhaseNumber
{
get { return m_currentPhase; }
}
#endregion
///
/// Initializes a new instance of the
/// The number of participating threads.
///
public Barrier(int participantCount)
: this(participantCount, null)
{
}
///
/// Initializes a new instance of the
/// The number of participating threads.
/// The
///
/// The
public Barrier(int participantCount, Action postPhaseAction)
{
// the count must be non negative value
if (participantCount < 0 || participantCount > MAX_PARTICIPANTS)
{
throw new ArgumentOutOfRangeException("participantCount", participantCount, SR.GetString(SR.Barrier_ctor_ArgumentOutOfRange));
}
m_currentTotalCount = (int)participantCount;
m_postPhaseAction = postPhaseAction;
//Lazily initialize the events
m_oddEvent = new ManualResetEventSlim(true);
m_evenEvent = new ManualResetEventSlim(false);
// Capture the context if the post phase action is not null
if (postPhaseAction != null && !ExecutionContext.IsFlowSuppressed())
{
m_ownerThreadContext = ExecutionContext.Capture();
}
m_actionCallerID = 0;
}
///
/// Extract the three variables current, total and sense from a given big variable
///
/// The integer variable that contains the other three variables
/// The current cparticipant count
/// The total participants count
/// The sense flag
private void GetCurrentTotal(int currentTotal, out int current, out int total, out bool sense)
{
total = (int)(currentTotal & TOTAL_MASK);
current = (int)((currentTotal & CURRENT_MASK) >> 16);
sense = (currentTotal & SENSE_MASK) == 0 ? true : false;
}
///
/// Write the three variables current. total and the sense to the m_currentTotal
///
/// The old current total to compare
/// The current cparticipant count
/// The total participants count
/// The sense flag
/// True if the CAS succeeded, false otherwise
private bool SetCurrentTotal(int currentTotal, int current, int total, bool sense)
{
int newCurrentTotal = (current <<16) | total;
if (!sense)
{
newCurrentTotal |= SENSE_MASK;
}
#pragma warning disable 0420
return Interlocked.CompareExchange(ref m_currentTotalCount, newCurrentTotal, currentTotal) == currentTotal;
#pragma warning restore 0420
}
///
/// Notifies the
/// The phase number of the barrier in which the new participants will first
/// participate.
///
/// Adding a participant would cause the barrier's participant count to
/// exceed
///
/// The method was invoked from within a post-phase action.
///
/// The current instance has already been
/// disposed.
public long AddParticipant()
{
try
{
return AddParticipants(1);
}
catch (ArgumentOutOfRangeException)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_AddParticipants_Overflow_ArgumentOutOfRange));
}
}
///
/// Notifies the
/// The number of additional participants to add to the
/// barrier.
/// The phase number of the barrier in which the new participants will first
/// participate.
/// Adding
///
/// The method was invoked from within a post-phase action.
///
/// The current instance has already been
/// disposed.
public long AddParticipants(int participantCount)
{
// check dispose
ThrowIfDisposed();
if (participantCount < 1 )
{
throw new ArgumentOutOfRangeException("participantCount", participantCount,
SR.GetString(SR.Barrier_AddParticipants_NonPositive_ArgumentOutOfRange));
}
else if (participantCount > MAX_PARTICIPANTS) //overflow
{
throw new ArgumentOutOfRangeException("participantCount",
SR.GetString(SR.Barrier_AddParticipants_Overflow_ArgumentOutOfRange));
}
// in case of this is called from the PHA
if (m_actionCallerID != 0 && Thread.CurrentThread.ManagedThreadId == m_actionCallerID)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_InvalidOperation_CalledFromPHA));
}
SpinWait spinner = new SpinWait();
long newPhase = 0;
while (true)
{
int currentTotal = m_currentTotalCount;
int total;
int current;
bool sense;
GetCurrentTotal(currentTotal, out current, out total, out sense);
if (participantCount + total > MAX_PARTICIPANTS) //overflow
{
throw new ArgumentOutOfRangeException("participantCount",
SR.GetString(SR.Barrier_AddParticipants_Overflow_ArgumentOutOfRange));
}
if (SetCurrentTotal(currentTotal, current, total + participantCount, sense))
{
// Calculating the first phase for that participant, if the current phase already finished return the nextphase else return the current phase
// To know that the current phase is the sense doesn't match the
// phase odd even, so that means it didn't yet change the phase count, so currentPhase +1 is returned, otherwise currentPhase is returned
long currPhase = m_currentPhase;
newPhase = (sense != (currPhase % 2 == 0)) ? currPhase + 1 : currPhase;
// If this participants goona join the next phase, which means the postPhaseAction is being running, this participants must wait until this done
// and its event is reset.
// Without that, if the postPhaseAction takes long time, this means the event ehich the current participant is goint to wait on is still set
// (FinishPPhase didn't reset it yet) so it should wait until it reset
if (newPhase != currPhase)
{
// Wait on the opposite event
if (sense)
{
m_oddEvent.Wait();
}
else
{
m_evenEvent.Wait();
}
}
//This else to fix the racing where the current phase has been finished, m_currentPhase has been updated but the events have not been set/reset yet
// otherwise when this participant calls SignalAndWait it will wait on a set event however all other participants have not arrived yet.
else
{
if (sense && m_evenEvent.IsSet)
m_evenEvent.Reset();
else if (!sense && m_oddEvent.IsSet)
m_oddEvent.Reset();
}
break;
}
spinner.SpinOnce();
}
return newPhase;
}
///
/// Notifies the
/// The barrier already has 0
/// participants.
///
/// The method was invoked from within a post-phase action.
///
/// The current instance has already been
/// disposed.
public void RemoveParticipant()
{
RemoveParticipants(1);
}
///
/// Notifies the
/// The number of additional participants to remove from the barrier.
/// The barrier already has 0 participants.
///
/// The method was invoked from within a post-phase action.
///
/// The current instance has already been
/// disposed.
public void RemoveParticipants(int participantCount)
{
// check dispose
ThrowIfDisposed();
// Validate input
if (participantCount < 1)
{
throw new ArgumentOutOfRangeException("participantCount", participantCount,
SR.GetString(SR.Barrier_RemoveParticipants_NonPositive_ArgumentOutOfRange));
}
// in case of this is called from the PHA
if (m_actionCallerID != 0 && Thread.CurrentThread.ManagedThreadId == m_actionCallerID)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_InvalidOperation_CalledFromPHA));
}
SpinWait spinner = new SpinWait();
while (true)
{
int currentTotal = m_currentTotalCount;
int total;
int current;
bool sense;
GetCurrentTotal(currentTotal, out current, out total, out sense);
if (total < participantCount)
{
throw new ArgumentOutOfRangeException("participantCount",
SR.GetString(SR.Barrier_RemoveParticipants_ArgumentOutOfRange));
}
if (total - participantCount < current)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_RemoveParticipants_InvalidOperation));
}
// If the remaining participats = current participants, then finish the current phase
int remaingParticipants = total - participantCount;
if (remaingParticipants > 0 && current == remaingParticipants )
{
if (SetCurrentTotal(currentTotal, 0, total - participantCount, !sense))
{
FinishPhase(sense);
break;
}
}
else
{
if (SetCurrentTotal(currentTotal, current, total - participantCount, sense))
{
break;
}
}
spinner.SpinOnce();
}
}
///
/// Signals that a participant has reached the
///
/// The method was invoked from within a post-phase action, the barrier currently has 0 participants,
/// or the barrier is being used by more threads than are registered as participants.
///
/// The current instance has already been
/// disposed.
public void SignalAndWait()
{
SignalAndWait(new CancellationToken());
}
///
/// Signals that a participant has reached the
/// The
/// The method was invoked from within a post-phase action, the barrier currently has 0 participants,
/// or the barrier is being used by more threads than are registered as participants.
///
/// The current instance has already been
/// disposed.
public void SignalAndWait(CancellationToken cancellationToken)
{
#if DEBUG
bool result =
#endif
SignalAndWait(Timeout.Infinite, cancellationToken);
#if DEBUG
Debug.Assert(result);
#endif
}
///
/// Signals that a participant has reached the
/// A true if all other participants reached the barrier; otherwise, false.
///
/// The method was invoked from within a post-phase action, the barrier currently has 0 participants,
/// or the barrier is being used by more threads than are registered as participants.
///
/// The current instance has already been
/// disposed.
public Boolean SignalAndWait(TimeSpan timeout)
{
return SignalAndWait(timeout, new CancellationToken());
}
///
/// Signals that a participant has reached the
/// A true if all other participants reached the barrier; otherwise, false.
///
/// The method was invoked from within a post-phase action, the barrier currently has 0 participants,
/// or the barrier is being used by more threads than are registered as participants.
///
/// The current instance has already been
/// disposed.
public Boolean SignalAndWait(TimeSpan timeout, CancellationToken cancellationToken)
{
Int64 totalMilliseconds = (Int64)timeout.TotalMilliseconds;
if (totalMilliseconds < -1 || totalMilliseconds > int.MaxValue)
{
throw new System.ArgumentOutOfRangeException("timeout", timeout,
SR.GetString(SR.Barrier_SignalAndWait_ArgumentOutOfRange));
}
return SignalAndWait((int)timeout.TotalMilliseconds, cancellationToken);
}
///
/// Signals that a participant has reached the
/// The number of milliseconds to wait, or true if all other participants reached the barrier; otherwise, false.
///
/// The method was invoked from within a post-phase action, the barrier currently has 0 participants,
/// or the barrier is being used by more threads than are registered as participants.
///
/// The current instance has already been
/// disposed.
public bool SignalAndWait(int millisecondsTimeout)
{
return SignalAndWait(millisecondsTimeout, new CancellationToken());
}
///
/// Signals that a participant has reached the barrier and waits for all other participants to reach
/// the barrier as well, using a
/// 32-bit signed integer to measure the time interval, while observing a
/// The number of milliseconds to wait, or true if all other participants reached the barrier; otherwise, false.
///
/// The method was invoked from within a post-phase action, the barrier currently has 0 participants,
/// or the barrier is being used by more threads than are registered as participants.
///
/// The current instance has already been
/// disposed.
public bool SignalAndWait(int millisecondsTimeout, CancellationToken cancellationToken)
{
ThrowIfDisposed();
cancellationToken.ThrowIfCancellationRequested();
if (millisecondsTimeout < -1)
{
throw new System.ArgumentOutOfRangeException("millisecondsTimeout", millisecondsTimeout,
SR.GetString(SR.Barrier_SignalAndWait_ArgumentOutOfRange));
}
// in case of this is called from the PHA
if (m_actionCallerID != 0 && Thread.CurrentThread.ManagedThreadId == m_actionCallerID)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_InvalidOperation_CalledFromPHA));
}
// local variables to extract the basic barrier variable and update them
// The are declared here instead of inside the loop body because the will be used outside the loop
bool sense;
int total;
int current;
int currentTotal;
SpinWait spinner = new SpinWait();
while (true)
{
currentTotal = m_currentTotalCount;
GetCurrentTotal(currentTotal, out current, out total, out sense);
// throw if zero participants
if (total == 0)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_SignalAndWait_InvalidOperation_ZeroTotal));
}
// Try to detect if the number of threads for this phase exceeded the total number of participants or not
// This can be detected if the current is zero which means all participants for that phase has arrived and the phase number is not changed yet
if (current == 0 && sense != (m_currentPhase % 2 == 0))
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_SignalAndWait_InvalidOperation_ThreadsExceeded));
}
//This is the last thread, finish the phase
if (current + 1 == total)
{
if (SetCurrentTotal(currentTotal, 0, total, !sense))
{
#if !FEATURE_PAL // PAL doesn't support eventing
if (CdsSyncEtwBCLProvider.Log.IsEnabled())
{
CdsSyncEtwBCLProvider.Log.Barrier_PhaseFinished(sense, m_currentPhase);
}
#endif
FinishPhase(sense);
return true;
}
}
else if (SetCurrentTotal(currentTotal, current + 1, total, sense))
{
break;
}
spinner.SpinOnce();
}
// save the phase locally
long phase = m_currentPhase;
// ** Perform the real wait **
// select the correct event to wait on, based on the current sense.
ManualResetEventSlim eventToWaitOn = (sense) ? m_evenEvent : m_oddEvent;
bool waitWasCanceled = false;
bool waitResult = false;
try
{
waitResult = eventToWaitOn.Wait(millisecondsTimeout, cancellationToken);
}
catch (OperationCanceledException )
{
waitWasCanceled = true;
}
if (!waitResult)
{
//reset the spinLock to prepare it for the next loop
spinner.Reset();
//If the wait timeout expired and all other thread didn't reach the barrier yet, update the current count back
while (true)
{
bool newSense;
currentTotal = m_currentTotalCount;
GetCurrentTotal(currentTotal, out current, out total, out newSense);
// If the timeout expired and the phase has just finished, return true and this is considered as succeeded SignalAndWait
//otherwise the timeout expired and the current phase has not been finished yet, return false
//The phase is finished if the phase member variable is changed (incremented) or the sense has been changed
if (phase != m_currentPhase || sense != newSense)
{
// The current phase has been finished, but we shouldn't return before the events are set/reset otherwise this thread could start
// next phase and the appropriate event has not reset yet which could make it return immediately from the next phase SignalAndWait
// before waiting other threads
eventToWaitOn.Wait();
Debug.Assert(phase < m_currentPhase); // assert that the phase has been completely finished
//if here, then all the other participants had reached the barrier and moved to the
//next phase. Hence we cannot (and should not) backout the signal and can return true.
break;
}
//The phase has not been finished yet, try to update the current count.
if (SetCurrentTotal(currentTotal, current - 1, total, sense))
{
//if here, then the attempt to backout was successful.
//throw (a fresh) oce if cancellation woke the wait
//or return false if it was the timeout that woke the wait.
//
if (waitWasCanceled)
throw new OperationCanceledException(SR.GetString(SR.Common_OperationCanceled), cancellationToken);
else
return false;
}
spinner.SpinOnce();
}
}
if (m_exception != null)
throw new BarrierPostPhaseException(m_exception);
return true;
}
///
/// Finish the phase by invoking the post phase action, and setting the event, this must be called by the
/// last arrival thread
///
/// The current phase sense
private void FinishPhase(bool observedSense)
{
// Execute the PHA in try/finally block to reset the variables back in case of it threw an exception
if (m_postPhaseAction != null)
{
try
{
// Capture the caller thread ID to check if the Add/RemoveParticipant(s) is called from the PHA
m_actionCallerID = Thread.CurrentThread.ManagedThreadId;
if (m_ownerThreadContext != null)
{
ExecutionContext.Run(m_ownerThreadContext.CreateCopy(), i => m_postPhaseAction(this), null);
}
else
{
m_postPhaseAction(this);
}
m_exception = null; // reset the exception if it was set previously
}
catch (Exception ex)
{
m_exception = ex;
}
finally
{
m_actionCallerID = 0;
SetResetEvents(observedSense);
if(m_exception != null)
throw new BarrierPostPhaseException(m_exception);
}
}
else
{
SetResetEvents(observedSense);
}
}
///
/// Sets the current phase event and reset the next phase event
///
/// The current phase sense
private void SetResetEvents(bool observedSense)
{
// Increment the phase count
m_currentPhase++;
if (observedSense)
{
m_oddEvent.Reset();
m_evenEvent.Set();
}
else
{
m_evenEvent.Reset();
m_oddEvent.Set();
}
}
///
/// Releases all resources used by the current instance of
///
/// The method was invoked from within a post-phase action.
///
///
/// Unlike most of the members of
public void Dispose()
{
// in case of this is called from the PHA
if (m_actionCallerID != 0 && Thread.CurrentThread.ManagedThreadId == m_actionCallerID)
{
throw new InvalidOperationException(SR.GetString(SR.Barrier_InvalidOperation_CalledFromPHA));
}
Dispose(true);
GC.SuppressFinalize(this);
}
///
/// When overridden in a derived class, releases the unmanaged resources used by the
///
/// true to release both managed and unmanaged resources; false to release
/// only unmanaged resources.
///
/// Unlike most of the members of
protected virtual void Dispose(bool disposing)
{
if (!m_disposed)
{
if (disposing)
{
m_oddEvent.Dispose();
m_evenEvent.Dispose();
}
m_disposed = true;
}
}
///
/// Throw ObjectDisposedException if the barrier is disposed
///
private void ThrowIfDisposed()
{
if (m_disposed)
{
throw new ObjectDisposedException("Barrier", SR.GetString(SR.Barrier_Dispose));
}
}
}
}
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