RTI Connext C API
Version 5.3.1
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Provides a hint as to the maximum acceptable delay from the time the data is written to the time it is received by the subscribing applications. More...
Data Fields | |
struct DDS_Duration_t | duration |
Duration of the maximum acceptable delay. | |
Provides a hint as to the maximum acceptable delay from the time the data is written to the time it is received by the subscribing applications.
This policy is a hint to a DDS implementation; it can be used to change how it processes and sends data that has low latency requirements. The DDS specification does not mandate whether or how this policy is used.
This policy provides a means for the application to indicate to the middleware the urgency of the data communication. By having a non-zero duration
, RTI Connext can optimize its internal operation.
RTI Connext uses it in conjunction with DDS_ASYNCHRONOUS_PUBLISH_MODE_QOS DDS_DataWriter instances associated with a DDS_EDF_FLOW_CONTROLLER_SCHED_POLICY DDS_FlowController only. Together with the time of write, DDS_LatencyBudgetQosPolicy::duration determines the deadline of each individual sample. RTI Connext uses this information to prioritize the sending of asynchronously published data; see DDS_AsynchronousPublisherQosPolicy.
The value offered is considered compatible with the value requested if and only if the inequality offered duration <= requested duration evaluates to 'TRUE'.
struct DDS_Duration_t DDS_LatencyBudgetQosPolicy::duration |
Duration of the maximum acceptable delay.
[default] 0 (meaning minimize the delay)