private void InternalInitializeToNewCapacity(int newCapacity, BufferInitializer initializer, bool initializeSequentially)
{
Resize(newCapacity / m_entriesPerBuffer);
Action <int> initBuffer =
bufferNumber =>
{
m_entryBuffers[bufferNumber] = initializer != null
? initializer(bufferNumber *m_entriesPerBuffer, m_entriesPerBuffer)
: new TEntry[m_entriesPerBuffer];
};
var start = m_capacity / m_entriesPerBuffer;
var end = newCapacity / m_entriesPerBuffer;
var count = end - start;
if ((count > 16 || (count > 1 && initializer != null)) && !initializeSequentially)
{
// parallelization initialization of buffers brings significant improvement during deserialization where big buffer sizes are known beforehand
// (seen initialization of directed graph edges speed up from 300ms to 90ms)
Parallel.For(start, end, initBuffer);
}
else
{
for (int bufferNumber = start; bufferNumber < end; bufferNumber++)
{
initBuffer(bufferNumber);
}
}
m_capacity = newCapacity;
}
/// <summary>
/// Ensures that the buffer has the given capacity
/// NOTE: This method must be called prior to getting or setting entries in the buffer
/// </summary>
/// <param name="minimumCapacity">Minimum capacity</param>
/// <param name="initializer">Optional initializer for new buffers</param>
/// <param name="initializeSequentially">Whether the initializer needs to run sequentially</param>
/// <returns>Actual new capacity</returns>
public int Initialize(int minimumCapacity, BufferInitializer initializer = null, bool initializeSequentially = false)
{
if (m_capacity < minimumCapacity)
{
lock (m_syncRoot)
{
var currentCapacity = m_capacity;
var newCapacity = checked (minimumCapacity + m_entriesPerBuffer - 1) & ~m_entriesPerBufferMask;
if (currentCapacity < newCapacity)
{
// No more entry buffers. We need to allocate more.
// At least twice as many, but maybe more depending on requested capacity
newCapacity = Math.Max(m_entryBuffers.Length * m_entriesPerBuffer * 2, newCapacity);
InternalInitializeToNewCapacity(newCapacity, initializer, initializeSequentially);
}
}
}
return(m_capacity);
}
