//
// Executes the unpark callback.
//
private void UnparkCallback(int ws)
{
Debug.Assert(ws == StParkStatus.Success || ws == StParkStatus.Timeout ||
ws == StParkStatus.WaitCancelled);
//
// If the registered wait was cancelled, cancel the acquire
// attempt and return immediately.
//
if (ws == StParkStatus.WaitCancelled)
{
waitable._CancelAcquire(waitBlock, hint);
return;
}
//
// Set state to *our busy* grabing the current state, and execute
// the unpark callback processing.
//
StParker myBusy = new SentinelParker();
StParker oldState = Interlocked.Exchange <StParker>(ref state, myBusy);
do
{
//
// If the acquire operation was cancelled, cancel the acquire
// attempt on the waitable.
//
if (ws != StParkStatus.Success)
{
waitable._CancelAcquire(waitBlock, hint);
}
//
// Execute the user callback routine.
//
cbtid = Thread.CurrentThread.ManagedThreadId;
callback(cbState, ws == StParkStatus.Timeout);
cbtid = 0;
//
// If the registered wait was configured to execute once or
// there is an unregister in progress, set the state to INACTIVE.
// If a thread is waiting to unregister, unpark it.
//
if (executeOnce || !(oldState is SentinelParker))
{
if (!(oldState is SentinelParker))
{
oldState.Unpark(StParkStatus.Success);
}
else
{
state = INACTIVE;
}
return;
}
//
// We must re-register with the Waitable.
// So, initialize the parker and execute the WaitAny prologue.
//
cbparker.Reset(1);
int ignored = 0;
waitBlock = waitable._WaitAnyPrologue(cbparker, StParkStatus.Success, ref hint,
ref ignored);
//
// Enable the unpark callback.
//
ws = cbparker.EnableCallback(timeout, toTimer);
if (ws == StParkStatus.Pending)
{
//
// If the *state* field constains still *my busy* set it to ACTIVE.
//
if (state == myBusy)
{
Interlocked.CompareExchange <StParker>(ref state, ACTIVE, myBusy);
}
return;
}
//
// The waitable was already signalled. So, execute the unpark
// callback inline.
//
} while (true);
}
//
// Executes the unpark callback.
//
private void UnparkCallback(int ws)
{
Debug.Assert(ws == StParkStatus.Success || ws == StParkStatus.Timeout ||
ws == StParkStatus.TakeCancelled);
//
// If the registered take was cancelled, cancel the take attempt
// and return immediately.
//
if (ws == StParkStatus.TakeCancelled)
{
queue.CancelTakeAttempt(waitNode, hint);
return;
}
//
// Set state to *our busy*, grabing the current state.
//
StParker myBusy = new SentinelParker();
StParker oldState = Interlocked.Exchange <StParker>(ref state, myBusy);
do
{
//
// If the take operation succeeded, execute the take epilogue;
// otherwise, cancel the take attempt.
//
if (ws == StParkStatus.Success)
{
queue.TakeEpilogue();
}
else
{
queue.CancelTakeAttempt(waitNode, hint);
}
//
// Execute the user callback routine.
//
cbtid = Thread.CurrentThread.ManagedThreadId;
callback(cbState, waitNode == null ? dataItem : waitNode.channel,
ws == StParkStatus.Timeout);
cbtid = 0;
//
// If the registered take was configured to execute once or
// there is an unregister in progress, set the state to INACTIVE.
// If a thread is waiting to unregister, unpark it.
//
if (executeOnce || !(oldState is SentinelParker))
{
if (!(oldState is SentinelParker))
{
oldState.Unpark(StParkStatus.Success);
}
else
{
state = INACTIVE;
}
return;
}
//
// We must re-register with the queue.
// So, initialize the parker and execute the TakeAny prologue.
//
cbparker.Reset();
waitNode = queue.TryTakePrologue(cbparker, StParkStatus.Success, out dataItem,
ref hint);
//
// Enable the unpark callback.
//
if ((ws = cbparker.EnableCallback(timeout, toTimer)) == StParkStatus.Pending)
{
//
// If the *state* field is still *my busy* set it to ACTIVE;
// anyway, return.
//
if (state == myBusy)
{
Interlocked.CompareExchange <StParker>(ref state, ACTIVE, myBusy);
}
return;
}
//
// The take was already accomplished; so, to prevent uncontrolled
// reentrancy execute the unpark callback inline.
//
} while (true);
}
//
// Executes the timer callback
//
internal void TimerCallback(int ws)
{
Debug.Assert(ws == StParkStatus.Timeout || ws == StParkStatus.TimerCancelled);
//
// If the timer was cancelled, return immediately.
//
if (ws == StParkStatus.TimerCancelled)
{
return;
}
//
// Set timer state to *our busy* state, grabing the current state and
// execute the timer callback processing.
//
SentinelParker myBusy = new SentinelParker();
StParker oldState = Interlocked.Exchange <StParker>(ref state, myBusy);
do
{
//
// Signals the timer's event.
//
tmrEvent.Signal();
//
// Call the user-defined callback, if specified.
//
if (callback != null)
{
cbtid = Thread.CurrentThread.ManagedThreadId;
callback(cbState, true);
cbtid = 0;
}
//
// If the timer isn't periodic or if someone is trying to
// cancel it, process cancellation.
//
if (period == 0 || !(oldState is SentinelParker))
{
if (!(oldState is SentinelParker))
{
oldState.Unpark(StParkStatus.Success);
}
else
{
state = INACTIVE;
}
return;
}
//
// Initialize the timer's parker.
//
cbparker.Reset();
//
// Compute the timer delay and enable the unpark callback.
//
int timeout;
if (useDueTime)
{
timeout = dueTime;
useDueTime = false;
}
else
{
timeout = period | (1 << 31);
}
if ((ws = cbparker.EnableCallback(timeout, timer)) == StParkStatus.Pending)
{
if (state == myBusy)
{
Interlocked.CompareExchange <StParker>(ref state, ACTIVE, myBusy);
}
return;
}
//
// The timer already expired. So, execute the timer
// callback inline.
//
} while (true);
}
