protected RetainableMemory(AtomicCounter counter)
{
if (counter.IsValid)
{
if (counter.Count != 0)
{
ThrowHelper.ThrowArgumentException("counter.Count != 0");
}
}
Counter = counter;
}
protected override void Dispose(bool disposing)
{
if (ExternallyOwned)
{
ThrowHelper.ThrowNotSupportedException();
}
if (disposing)
{
var pool = Pool;
if (pool != null)
{
pool.ReturnInternal(this, clearMemory: !TypeHelper <T> .IsPinnable);
// pool calls Dispose(false) if a bucket is full
return;
}
// not pooled, doing finalization work now
GC.SuppressFinalize(this);
}
// Finalization
AtomicCounter.Dispose(ref CounterRef);
Debug.Assert(!_isPooled);
_poolIdx = default;
// we still could add this to the pool of free pinned slices that are backed by an existing slab
var pooledToFreeSlicesPool = _slicesPool.Return(this);
if (pooledToFreeSlicesPool)
{
return;
}
var array = Interlocked.Exchange(ref _array, null);
if (array != null)
{
ClearAfterDispose();
Debug.Assert(_handle.IsAllocated);
#pragma warning disable 618
_slab.Decrement();
_handle.Free();
#pragma warning restore 618
}
else
{
ThrowDisposed <ArrayMemorySlice <T> >();
}
Debug.Assert(!_handle.IsAllocated);
}
internal void Return(RetainableMemory <T> memory)
{
// Check to see if the buffer is the correct size for this bucket
if (memory.LengthPow2 != _bufferLength)
{
ThrowNotFromPool <RetainableMemory <T> >();
}
// While holding the spin lock, if there's room available in the bucket,
// put the buffer into the next available slot. Otherwise, we just drop it.
// The try/finally is necessary to properly handle thread aborts on platforms
// which have them.
int disposed = 0;
#if !NETCOREAPP
try
#endif
{
var spinner = new SpinWait();
while (0 != Interlocked.CompareExchange(ref _locker, 1, 0))
{
spinner.SpinOnce();
}
var pooled = _index != 0;
if (pooled)
{
if ((disposed = AtomicCounter.TryDispose(ref memory.CounterRef)) == 0)
{
_buffers[--_index] = memory;
Debug.Assert(AtomicCounter.GetIsDisposed(ref memory.CounterRef));
memory._isPooled = true;
}
}
else
{
memory.DisposeFinalize();
}
}
#if !NETCOREAPP
finally
#endif
{
Volatile.Write(ref _locker, 0);
}
// after unlock
if (disposed != 0)
{
AtomicCounter.ThrowNonZeroTryDispose(disposed);
}
}
private static ObjectPool <PrivateMemory <T> > CreateObjectPool()
{
var op = new ObjectPool <PrivateMemory <T> >(() =>
{
var pm = new PrivateMemory <T>();
AtomicCounter.Dispose(ref pm.CounterRef);
return(pm);
}, Settings.PrivateMemoryPerCorePoolSize ?? PerCorePoolSize);
// Need to touch these fields very early in a common not hot place for JIT static
// readonly optimization even if tiered compilation is off.
// Note single & to avoid short circuit.
if (AdditionalCorrectnessChecks.Enabled & TypeHelper <T> .IsReferenceOrContainsReferences)
{
ThrowHelper.Assert(!op.IsDisposed);
}
return(op);
}
public RetainableMemoryPool(Func <RetainableMemoryPool <T>, int, RetainableMemory <T> > factory,
int minLength = DefaultMinBufferLength,
int maxLength = DefaultMaxBufferLength,
int maxBuffersPerBucketPerCore = DefaultMaxNumberOfBuffersPerBucketPerCore,
int maxBucketsToTry = 2,
bool rentAlwaysClean = false)
{
if (factory == null)
{
throw new ArgumentNullException(nameof(factory));
}
lock (KnownPools)
{
// Start from 2, other code depends on the first 2 items being null.
// pool idx == 0 is always null which means a buffer is not from pool
// pool idx == 1 means a buffer is from default pool, e.g. static array pool
for (int i = 2; i < KnownPools.Length; i++)
{
if (KnownPools[i] == null)
{
PoolIdx = checked ((byte)i);
KnownPools[i] = this;
break;
}
}
if (PoolIdx == 0)
{
ThrowHelper.ThrowInvalidOperationException("KnownPools slots exhausted. 64 pools ought to be enough for anybody.");
}
}
IsRentAlwaysClean = rentAlwaysClean;
Factory = (length) =>
{
var memory = factory(this, length);
if (IsRentAlwaysClean)
{
memory.GetSpan().Clear();
}
AtomicCounter.Dispose(ref memory.CounterRef);
ThrowHelper.DebugAssert(memory.IsPooled);
return(memory);
};
if (minLength <= 16)
{
minLength = 16;
}
_minBufferLengthPow2 = 32 - BitUtil.NumberOfLeadingZeros(minLength - 1);
MinBufferLength = 1 << _minBufferLengthPow2;
if (maxBucketsToTry < 0)
{
maxBucketsToTry = 0;
}
MaxBucketsToTry = maxBucketsToTry;
if (maxLength <= 0)
{
throw new ArgumentOutOfRangeException(nameof(maxLength));
}
if (maxBuffersPerBucketPerCore < 0)
{
throw new ArgumentOutOfRangeException(nameof(maxBuffersPerBucketPerCore));
}
// Our bucketing algorithm has a min length of 2^4 and a max length of 2^30.
// Constrain the actual max used to those values.
const int maximumBufferLength = 0x40000000;
if (maxLength > maximumBufferLength)
{
maxLength = maximumBufferLength;
}
else if (maxLength < minLength)
{
maxLength = minLength;
}
MaxBufferLength = maxLength;
// Create the buckets.
int maxBuckets = SelectBucketIndex(maxLength);
var buckets = new MemoryBucket[maxBuckets + 1];
for (int i = 0; i < buckets.Length; i++)
{
buckets[i] = new MemoryBucket(this, GetMaxSizeForBucket(i), maxBuffersPerBucketPerCore);
}
_buckets = buckets;
}