public void Write <T>(T[] instances, Action <T> write)
{
RMonitor.Enter(_writersMutex);
try
{
var index = RInterlocked.Read(ref _index);
var nextIndex = Toggle(index);
if (WaitOnFirstWrite)
{
WaitWhileOccupied(_readIndicator[nextIndex]); // Now we're subject to starvation by (new) readers.
} // And mutual exclusion may still be violated.
_snoop.BeginWrite(nextIndex);
write(instances[nextIndex]);
_snoop.EndWrite(nextIndex);
// Move subsequent readers to 'next' instance
RInterlocked.Exchange(ref _index, nextIndex);
// Wait for all readers to finish reading the instance we want to write next
WaitWhileOccupied(_readIndicator[index]);
// At this point there may be readers, but they must be on nextReadIndex, we can
// safely write.
_snoop.BeginWrite(index);
write(instances[index]);
_snoop.EndWrite(index);
}
finally
{
RMonitor.Exit(_writersMutex);
}
}
private void PulsingThread(int numPulses)
{
for (int i = 0; i < numPulses; ++i)
{
RMonitor.Enter(_lockObject);
RMonitor.Pulse(_lockObject);
RMonitor.Exit(_lockObject);
}
}
private void LockingThread(int idx)
{
var myLock = ActiveConfig.LockObjects[idx];
var nextLock = ActiveConfig.LockObjects[(idx + 1) % ActiveConfig.NumThreads];
RMonitor.Enter(myLock);
RMonitor.Enter(nextLock);
RMonitor.Exit(nextLock);
RMonitor.Exit(myLock);
}
internal void EnterWriteLock()
{
RMonitor.Enter(_lockObj);
RUnordered.Write(ref _writerActive, 1);
RInterlocked.MemoryBarrierProcessWide();
while (ReadInProgress())
{
RE.Yield();
}
_snoop.BeginWrite();
return;
}
private void EnterSlow()
{
RMonitor.Enter(_lockObj);
RUnordered.Write(ref _holdingThreadId, Environment.CurrentManagedThreadId);
RInterlocked.MemoryBarrierProcessWide();
while (RUnordered.Read(ref _isHeld) == 1)
{
RE.Yield();
}
RUnordered.Write(ref _isHeld, 1);
RMonitor.Exit(_lockObj);
return;
}
internal void EnterReadLock()
{
var idx = GetReaderIndex();
RUnordered.Write(ref _readIndicator[idx], 1);
if (RUnordered.Read(ref _writerActive) == 1)
{
RUnordered.Write(ref _readIndicator[idx], 0);
RMonitor.Enter(_lockObj);
RUnordered.Write(ref _readIndicator[idx], 1);
RMonitor.Exit(_lockObj);
}
_snoop.BeginRead();
}
private LockCookie EnterSlow()
{
RMonitor.Enter(_lockObj);
var oldEntry = RUnordered.Read(ref _current);
RUnordered.Write(ref _current, new LockCookie(Environment.CurrentManagedThreadId));
RInterlocked.MemoryBarrierProcessWide();
while (oldEntry != null && RUnordered.Read(ref oldEntry.Taken) == 1)
{
RE.Yield();
}
var current = RUnordered.Read(ref _current);
RUnordered.Write(ref current.Taken, 1);
RMonitor.Exit(_lockObj);
return(current);
}
public void Write <T>(T[] instances, Action <T> write)
{
RMonitor.Enter(_writersMutex);
try
{
// var readIndex = RUnordered.Read(ref _readIndex);
var readIndex = RInterlocked.Read(ref _readIndex);
var nextReadIndex = Toggle(readIndex);
_snoop.BeginWrite(nextReadIndex);
write(instances[nextReadIndex]);
_snoop.EndWrite(nextReadIndex);
// Move subsequent readers to 'next' instance
RInterlocked.Exchange(ref _readIndex, nextReadIndex);
// Wait for all readers marked in the 'next' read indicator,
// these readers could be reading the 'readIndex' instance
// we want to write next
var versionIndex = RInterlocked.Read(ref _versionIndex);
//var versionIndex = RUnordered.Read(ref _versionIndex);
var nextVersionIndex = Toggle(versionIndex);
WaitWhileOccupied(_readIndicator[nextVersionIndex]);
// Move subsequent readers to the 'next' read indicator
RInterlocked.Exchange(ref _versionIndex, nextVersionIndex);
// RUnordered.Write(ref _versionIndex, nextVersionIndex);
// At this point all subsequent readers will read the 'next' instance
// and mark the 'nextVersionIndex' read indicator, so the only remaining potential
// readers are the ones on the 'versionIndex' read indicator, so wait for them to finish
WaitWhileOccupied(_readIndicator[versionIndex]);
// At this point there may be readers, but they must be on nextReadIndex, we can
// safely write.
_snoop.BeginWrite(readIndex);
write(instances[readIndex]);
_snoop.EndWrite(readIndex);
}
finally
{
RMonitor.Exit(_writersMutex);
}
}
public void Write <T>(T[] instances, Action <T> write)
{
RMonitor.Enter(_writersMutex);
try
{
var readIndex = RInterlocked.Read(ref _readIndex);
var nextReadIndex = Toggle(readIndex);
_snoop.BeginWrite(nextReadIndex);
write(instances[nextReadIndex]);
_snoop.EndWrite(nextReadIndex);
RInterlocked.Exchange(ref _readIndex, nextReadIndex);
WaitWhileOccupied(_readIndicator);
_snoop.BeginWrite(readIndex);
write(instances[readIndex]);
_snoop.EndWrite(readIndex);
}
finally
{
RMonitor.Exit(_writersMutex);
}
}
internal void ExitWriteLock()
{
RUnordered.Write(ref _writerActive, 0);
_snoop.EndWrite();
RMonitor.Exit(_lockObj);
}
public void WaitingThread()
{
RMonitor.Enter(_lockObject);
RMonitor.Wait(_lockObject);
RMonitor.Exit(_lockObject);
}