internal override void CollectStoppable(int currentThreadIndex,
int generation)
{
int foundIndex =
Interlocked.CompareExchange(ref StopTheWorldGCData.collectorThreadIndex,
currentThreadIndex, -1);
if (foundIndex < 0)
{
// We are the designated collector thread
PerformCollection(currentThreadIndex, generation);
}
else
{
Transitions.TakeDormantControlNoGC(currentThreadIndex);
if (Transitions.TakeGCControl(currentThreadIndex))
{
// The 'foundIndex' thread may have completed its
// collection and another thread may have started
// another collection after we read
// 'collectorThreadIndex'. The collector thread may
// have decided to wait for us before we entered
// DormantState, so we have to read
// 'collectorThreadIndex' again.
foundIndex = collectorThreadIndex;
if (foundIndex >= 0)
{
Thread.SignalGCEvent(foundIndex);
}
}
Transitions.TakeMutatorControlNoGC(currentThreadIndex);
}
}
internal static void AllThreadRendezvous(int currentThreadIndex)
{
Transitions.MakeGCRequests(currentThreadIndex);
for (int i = 0; i < Thread.threadTable.Length; i++)
{
if (Thread.threadTable[i] == null ||
i == currentThreadIndex)
{
continue;
}
CollectorStatistics.Event(GCEvent.StopThread, i);
while (!Transitions.TakeGCControl(i) &&
!Transitions.UnderGCControl(i) &&
Transitions.HasGCRequest(i) &&
Thread.threadTable[i] != null)
{
// NOTE: there is no code in this loop that could
// cause a signal on an event to be consumed.
Thread.WaitForGCEvent(currentThreadIndex);
}
}
}