SoDelayQueueSensor(3)

NAME
SoDelayQueueSensor - The SoDelayQueueSensor class is the abstract base class for priority scheduled sensors.

Delay queue sensors are invoked upon various events not related to time occurrences. See documentation of subclasses to see which types of events can be surveilled by the builtin sensor types.

SYNOPSIS

#include <Inventor/sensors/SoDelayQueueSensor.h>

Inherits SoSensor.

Inherited by SoDataSensor, SoIdleSensor, and SoOneShotSensor.

  Public Member Functions
SoDelayQueueSensor (void)
SoDelayQueueSensor (SoSensorCB *func, void *data)
virtual ~SoDelayQueueSensor (void)
void setPriority (uint32_t pri)
uint32_t getPriority (void) const
virtual void schedule (void)
virtual void unschedule (void)
virtual SbBool isScheduled (void) const
virtual SbBool isIdleOnly (void) const
virtual void trigger (void)

  Static Public Member Functions
static uint32_t getDefaultPriority (void)

  Protected Attributes
SbBool scheduled

Detailed Description

The SoDelayQueueSensor class is the abstract base class for priority scheduled sensors.

Delay queue sensors are invoked upon various events not related to time occurrences. See documentation of subclasses to see which types of events can be surveilled by the builtin sensor types. The priority values can be used to queue events by their importance, so the sensors are triggered in the sequence you want.

The queue of delay sensors (i.e. instances of subclasses of SoDelayQueueSensor) will be processed as soon as either the run-time system is idle, or if it is continually busy they will be processed within a fixed amount of time.

This time interval is by default 1/12th of a second, but can be controlled with the SoSensorManager::setDelaySensorTimeout() interface.

Constructor & Destructor Documentation

  SoDelayQueueSensor::SoDelayQueueSensor (void)
Default constructor.

  SoDelayQueueSensor::SoDelayQueueSensor (SoSensorCB * func, void * data)
Constructor taking as arguments the sensor callback function and the userdata which will be passed the callback.

See also:
    setFunction(), setData()

  SoDelayQueueSensor::~SoDelayQueueSensor (void) [virtual]
Destructor.

Member Function Documentation

  void SoDelayQueueSensor::setPriority (uint32_t pri)
Set this sensor's priority in the scheduling queue. When sensors are processed, high priority sensors will trigger before low priority sensors.

Please note that a low number means a high priority. A sensor with priority 5 will trigger before a sensor with priority 6.

Sensors with priority 0 have a special meaning in Coin/Inventor. They are called immediate sensors, and will trigger immediately after the current notification chain has finished. Priority 0 sensors should be used with care, since they might lead to bad performance if you do some processing in the sensor callback.

This setting does not affect SoDataSensor delete-callback invocations, which always are immediate.

See also:
    getPriority(), getDefaultPriority()

  uint32_t SoDelayQueueSensor::getPriority (void) const
Returns sensor scheduling priority.

See also:
    setPriority(), getDefaultPriority()

  uint32_t SoDelayQueueSensor::getDefaultPriority (void) [static]
Returns the default scheduling priority value. The default sensor priority is 100.

See also:
    getPriority()

  void SoDelayQueueSensor::schedule (void) [virtual]
Put the sensor in the global delay queue. This means it will be triggered either when the CPU is idle, or when the specified delay queue time-out is reached.

See also:
    SoDB::setDelaySensorTimeout(), unschedule(), isScheduled()

Implements SoSensor.

  void SoDelayQueueSensor::unschedule (void) [virtual]
Remove sensor from the delay queue, without triggering it first.

See also:
    schedule(), isScheduled()

Implements SoSensor.

  SbBool SoDelayQueueSensor::isScheduled (void) const [virtual]
Check if this sensor is scheduled for triggering.

See also:
    schedule(), unschedule()

Implements SoSensor.

  SbBool SoDelayQueueSensor::isIdleOnly (void) const [virtual]
Returns a flag indicating whether or not the sensor should only be triggered if the application is truly idle, and not when the delay queue is processed because of the delay queue timeout.

See also:
    SoDB::setDelaySensorTimeout()

  void SoDelayQueueSensor::trigger (void) [virtual]
Trigger the sensor's callback function.

Reimplemented from SoSensor.

Reimplemented in SoDataSensor, and SoFieldSensor.

Member Data Documentation

  SbBool SoDelayQueueSensor::scheduled [protected]
TRUE if the sensor is currently scheduled.

Author

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