public StParker(IParkSpot parkSpot) : this(1, parkSpot) { }
public StParker(int releasers, IParkSpot parkSpot) : this(releasers) {
this.parkSpot = parkSpot;
}
public int Park(int spinCount, StCancelArgs cargs) {
do {
if (state == 0) {
return waitStatus;
}
if (cargs.Alerter != null && cargs.Alerter.IsSet && TryCancel()) {
return StParkStatus.Alerted;
}
if (spinCount-- <= 0) {
break;
}
Platform.SpinWait(1);
} while (true);
if (parkSpot == null) {
parkSpot = ThreadExtensions.ForCurrentThread.ParkSpotFactory.Create();
}
//
// Try to clear the wait-in-progress bit. If the bit was already
// cleared, the thread is unparked.
//
if (!TestAndClearInProgress()) {
return waitStatus;
}
//
// If an alerter was specified, we register the parker with
// the alerter before blocking the thread on the park spot.
//
bool unregister = false;
if (cargs.Alerter != null) {
if (!(unregister = cargs.Alerter.RegisterParker(this))) {
//
// The alerter is already set. So, we try to cancel the parker.
//
if (TryCancel()) {
return StParkStatus.Alerted;
}
//
// We can't cancel the parker because someone else acquired
// the count down lock. We must wait unconditionally until
// the park spot is set.
//
cargs = StCancelArgs.None;
}
}
parkSpot.Wait(this, cargs);
if (unregister) {
cargs.Alerter.DeregisterParker(this);
}
return waitStatus;
}
public StParker(IParkSpot parkSpot) : this(1, parkSpot)
{
}
public StParker(int releasers, IParkSpot parkSpot) : this(releasers) {
this.parkSpot = parkSpot;
}
public int Park(int spinCount, StCancelArgs cargs)
{
do
{
if (state == 0)
{
return(waitStatus);
}
if (cargs.Alerter != null && cargs.Alerter.IsSet && TryCancel())
{
return(StParkStatus.Alerted);
}
if (spinCount-- <= 0)
{
break;
}
Platform.SpinWait(1);
} while (true);
if (parkSpot == null)
{
parkSpot = ThreadExtensions.ForCurrentThread.ParkSpotFactory.Create();
}
//
// Try to clear the wait-in-progress bit. If the bit was already
// cleared, the thread is unparked.
//
if (!TestAndClearInProgress())
{
return(waitStatus);
}
//
// If an alerter was specified, we register the parker with
// the alerter before blocking the thread on the park spot.
//
bool unregister = false;
if (cargs.Alerter != null)
{
if (!(unregister = cargs.Alerter.RegisterParker(this)))
{
//
// The alerter is already set. So, we try to cancel the parker.
//
if (TryCancel())
{
return(StParkStatus.Alerted);
}
//
// We can't cancel the parker because someone else acquired
// the count down lock. We must wait unconditionally until
// the park spot is set.
//
cargs = StCancelArgs.None;
}
}
parkSpot.Wait(this, cargs);
if (unregister)
{
cargs.Alerter.DeregisterParker(this);
}
return(waitStatus);
}
