/// <summary>
/// Resizes a table to a certain length (or larger).
/// </summary>
private void GrowTable(ref LinkedSlotVolatile[] table, int minLength)
{
Contract.Assert(table.Length < minLength);
// Determine the size of the new table and allocate it.
int newLen = GetNewTableSize(minLength);
LinkedSlotVolatile[] newTable = new LinkedSlotVolatile[newLen];
//
// The lock is necessary to avoid a race with ThreadLocal.Dispose. GrowTable has to point all
// LinkedSlot instances referenced in the old table to reference the new table. Without locking,
// Dispose could use a stale SlotArray reference and clear out a slot in the old array only, while
// the value continues to be referenced from the new (larger) array.
//
lock (s_idManager)
{
for (int i = 0; i < table.Length; i++)
{
LinkedSlot linkedSlot = table[i].Value;
if (linkedSlot != null && linkedSlot.SlotArray != null)
{
linkedSlot.SlotArray = newTable;
newTable[i] = table[i];
}
}
}
table = newTable;
}
private void SetValueSlow(T value, LinkedSlotVolatile[] slotArray)
{
int id = ~m_idComplement;
// If the object has been disposed, id will be -1.
if (id < 0)
{
throw new ObjectDisposedException(Environment.GetResourceString("ThreadLocal_Disposed"));
}
// If a slot array has not been created on this thread yet, create it.
if (slotArray == null)
{
slotArray = new LinkedSlotVolatile[GetNewTableSize(id + 1)];
ts_finalizationHelper = new FinalizationHelper(slotArray, m_trackAllValues);
ts_slotArray = slotArray;
}
// If the slot array is not big enough to hold this ID, increase the table size.
if (id >= slotArray.Length)
{
GrowTable(ref slotArray, id + 1);
ts_finalizationHelper.SlotArray = slotArray;
ts_slotArray = slotArray;
}
// If we are using the slot in this table for the first time, create a new LinkedSlot and add it into
// the linked list for this ThreadLocal instance.
if (slotArray[id].Value == null)
{
CreateLinkedSlot(slotArray, id, value);
}
else
{
// Volatile read of the LinkedSlotVolatile.Value property ensures that the m_initialized read
// that follows will not be reordered before the read of slotArray[id].
LinkedSlot slot = slotArray[id].Value;
// It is important to verify that the ThreadLocal instance has not been disposed. The check must come
// after capturing slotArray[id], but before assigning the value into the slot. This ensures that
// if this ThreadLocal instance was disposed on another thread and another ThreadLocal instance was
// created, we definitely won't assign the value into the wrong instance.
if (!m_initialized)
{
throw new ObjectDisposedException(Environment.GetResourceString("ThreadLocal_Disposed"));
}
slot.Value = value;
}
}
