DDS_EventQosPolicy Struct Reference

Settings for event. More...

Data Fields
struct DDS_ThreadSettings_t	thread
	Event thread QoS.
DDS_Long	initial_count
	The initial number of events.
DDS_Long	max_count
	The maximum number of events.

Detailed Description

Settings for event.

In a DDS_DomainParticipant, a thread is dedicated to handle all timed events, including checking for timeouts and deadlines and executing internal and user-defined timeout or exception handling routines/callbacks.

This QoS policy allows you to configure thread properties such as priority level and stack size. You can also configure the maximum number of events that can be posted to the event thread. By default, a DDS_DomainParticipant will dynamically allocate memory as needed for events posted to the event thread. However, by setting a maximum value or setting the initial and maximum value to be the same, you can either bound the amount of memory allocated for the event thread or prevent a DDS_DomainParticipant from dynamically allocating memory for the event thread after initialization.

This QoS policy is an extension to the DDS standard.

Entity:

DDS_DomainParticipant

Properties:

RxO = N/A
Changeable = NO

Field Documentation

struct DDS_ThreadSettings_t DDS_EventQosPolicy::thread

Event thread QoS.

There is only one event thread.

Priority:
[default] The actual value depends on your architecture:
For Windows: -2
For Solaris: OS default priority
For Linux: OS default priority
For LynxOS: 13
For INTEGRITY: 80
For VxWorks: 110
For all others: OS default priority.

Stack Size:
[default] The actual value depends on your architecture:
For Windows: OS default stack size
For Solaris: OS default stack size
For Linux: OS default stack size
For LynxOS: 4*16*1024
For INTEGRITY: 4*20*1024
For VxWorks: 4*16*1024
For all others: OS default stack size.

Mask:
[default] mask = DDS_THREAD_SETTINGS_FLOATING_POINT | DDS_THREAD_SETTINGS_STDIO

DDS_Long DDS_EventQosPolicy::initial_count

The initial number of events.

[default] 256

[range] [1, 1 million], <= max_count

DDS_Long DDS_EventQosPolicy::max_count

The maximum number of events.

The maximum number of events. If the limit is reached, no new event can be added.

[default] DDS_LENGTH_UNLIMITED

[range] [1, 1 million] or DDS_LENGTH_UNLIMITED, >= initial_count