internal object Allocate()
{
#if ENABLE
// Check to see whether or not the cache is disabled.
if (m_CacheName == null)
{
return(m_factory());
}
#endif
// Fast path, get it from our Gen2 aged m_FreeList.
object returnBuffer;
if (!m_FreeList.TryPop(out returnBuffer))
{
Restock(out returnBuffer);
}
// Computing free count is expensive enough that we don't want to compute it unless logging is on.
if (PinnableBufferCacheEventSource.Log.IsEnabled())
{
int numAllocCalls = Interlocked.Increment(ref m_numAllocCalls);
if (numAllocCalls >= 1024)
{
lock (this)
{
int previousNumAllocCalls = Interlocked.Exchange(ref m_numAllocCalls, 0);
if (previousNumAllocCalls >= 1024)
{
int nonGen2Count = 0;
foreach (object o in m_FreeList)
{
if (GC.GetGeneration(o) < GC.MaxGeneration)
{
nonGen2Count++;
}
}
PinnableBufferCacheEventSource.Log.WalkFreeListResult(m_CacheName, m_FreeList.Count, nonGen2Count);
}
}
}
PinnableBufferCacheEventSource.Log.AllocateBuffer(m_CacheName, PinnableBufferCacheEventSource.AddressOf(returnBuffer), returnBuffer.GetHashCode(), GC.GetGeneration(returnBuffer), m_FreeList.Count);
}
return(returnBuffer);
}
internal void Free(object buffer)
{
#if ENABLE
// Check to see whether or not the cache is disabled.
if (m_CacheName == null)
{
return;
}
#endif
if (PinnableBufferCacheEventSource.Log.IsEnabled())
{
PinnableBufferCacheEventSource.Log.FreeBuffer(m_CacheName, PinnableBufferCacheEventSource.AddressOf(buffer), buffer.GetHashCode(), m_FreeList.Count);
}
if (buffer == null)
{
if (PinnableBufferCacheEventSource.Log.IsEnabled())
{
PinnableBufferCacheEventSource.Log.FreeBufferNull(m_CacheName, m_FreeList.Count);
}
return;
}
// After we've done 3 gen1 GCs, assume that all buffers have aged into gen2 on the free path.
if ((m_gen1CountAtLastRestock + 3) > GC.CollectionCount(GC.MaxGeneration - 1))
{
lock (this)
{
if (GC.GetGeneration(buffer) < GC.MaxGeneration)
{
// The buffer is not aged, so put it in the non-aged free list.
m_moreThanFreeListNeeded = true;
PinnableBufferCacheEventSource.Log.FreeBufferStillTooYoung(m_CacheName, m_NotGen2.Count);
m_NotGen2.Add(buffer);
m_gen1CountAtLastRestock = GC.CollectionCount(GC.MaxGeneration - 1);
return;
}
}
}
// If we discovered that it is indeed Gen2, great, put it in the Gen2 list.
m_FreeList.Push(buffer);
}
