internal static void AllThreadRelease(int currentThreadIndex)
{
for (int i = 0; i < Thread.threadTable.Length; i++)
{
#if SINGULARITY_KERNEL
if (Scheduler.IsIdleThread(i))
{
continue;
}
#endif
if (i == currentThreadIndex)
{
if (Transitions.HasGCRequest(i))
{
Transitions.ClearGCRequest(i);
}
}
else if (Transitions.UnderGCControl(i))
{
Transitions.ReleaseGCControl(i);
}
// Signal all threads to ensure that the GC process didn't
// accidentally "gobble" an event signal that was meant for
// something else.
if (Thread.threadTable[i] != null)
{
Thread.SignalGCEvent(i);
}
}
}
private static void VerifyAllThreadsGCControlled(Thread thread)
{
int limit = Thread.threadTable.Length;
for (int i = 0; i < limit; i++)
{
Thread t = Thread.threadTable[i];
if (t != null && t != thread)
{
#if !SINGULARITY
VTable.Assert(Transitions.UnderGCControl(t.threadIndex));
#endif
}
}
}
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);
}
}
}
internal static void EnsureAllocationAllowed()
{
// Verify that we're not in an interrupt or non-preemptible region where allocations are prohibited
Microsoft.Singularity.Processor currentProcessor = Microsoft.Singularity.Processor.CurrentProcessor;
if (currentProcessor != null) // The Processor object itself may still need to be allocated
{
if (currentProcessor.InInterruptContext)
{
Tracing.Log(Tracing.Fatal, "Attempt to allocate memory from interrupt context!");
VTable.DebugPrint("Attempt to allocate memory from interrupt context!\n");
VTable.DebugBreak();
}
#if false // Currently too many allocations with preemption disabled to debug right now
if (currentProcessor.PreemptionDisabled)
{
VTable.DebugPrint("Attempt to allocate memory with preemption disabled!\n");
VTable.DebugBreak();
}
#endif
}
VTable.Deny(Thread.CurrentThread != null &&
Transitions.fInitializedRuntime &&
Transitions.UnderGCControl(Thread.GetCurrentThreadIndex()));
}