Relation API binds two named instances, for example, tasks, with a reasonable relation attribute. Relations can be added before or after the actual instances are created and persist independently of the instances.
To logically group a bunch of tasks, you can use different types of relations:
void ITTAPI __itt_relation_add(const __itt_domain *domain, __itt_id head, __itt_relation relation, __itt_id tail) void ITTAPI __itt_relation_add_ex(const __itt_domain *domain, __itt_clock_domain* clock_domain, unsigned long long timestamp, __itt_id head, __itt_relation relation, __itt_id tail)
The following table defines the parameters used in the Relation API primitives.
Type
|
Parameter
|
Description
|
|---|---|---|
[in] | __itt_domain* domain |
Relation domain
|
[in] | __itt_relation relation |
User-defined logical relation between two named instances
|
[in] |
__itt_id head
|
Metadata name
|
[in] |
__itt_id tail
|
IDs of two named related instances
|
size_t count | ||
[in] | __itt_clock_domain* clock_domain |
User-defined clock domain
|
[in] |
unsigned long long timestamp
|
User-defined timestamp for the corresponding clock domain
|