Metadata is extra information, generic data which can be attached to a task, a thread, a process, etc. Metadata has a type, name, and value. The value encoding depends on a metadata type. It may contain either string data or a number of integer or floating point values.
To create metadata, use the following primitives:
void __itt_metadata_add(const __itt_domain *domain, __itt_id id, __itt_string_handle *key, __itt_metadata_type type, size_t count, void *data) void __itt_metadata_str_addA(const __itt_domain *domain, __itt_id id, __itt_string_handle *key, const char *data, size_t length) void __itt_metadata_str_addW(const __itt_domain *domain, __itt_id id, __itt_string_handle *key, const wchar_t *data, size_t length) void __itt_metadata_add_with_scope(const __itt_domain *domain, __itt_scope scope, __itt_string_handle *key, __itt_metadata_type type, size_t count, void *data) void __itt_metadata_str_add_with_scopeA(const __itt_domain *domain, __itt_scope scope, __itt_string_handle *key, const char *data, size_t length) void __itt_metadata_str_add_with_scopeW(const __itt_domain *domain, __itt_scope scope, __itt_string_handle *key, const wchar_t *data, size_t length)
The following table defines the parameters used in the Metadata API primitives.
Type
|
Parameter
|
Description
|
|---|---|---|
[in] | __itt_domain* domain |
Metadata domain
|
[in] | __itt_scope scope |
Metadata scope: task, thread, process, and global. If a scope is undefined, metadata belongs to the last task in the thread.
|
[in] | __itt_string_handle* name |
Metadata name
|
[in] | __itt_metadata_type type |
Metadata type; used only for numeric metadata
|
[in] | size_t count |
Number of numeric metadata items
|
[in] | size_t length |
Number of symbols a metadata string
|
[in] | void *data |
Actual metadata (array of numerics or string)
|
const char *data | ||
const wchar_t *data |