pm_start_mygroup and pm_tstart_mygroup Subroutine
Purpose
Starts Performance Monitor counting for the group to which the calling thread belongs.
Library
Performance Monitor APIs Library (libpmapi.a)
Syntax
#include <pmapi.h>
int_pm_start_mygroup()
int pm_tstart_mygroup (*time)
timebasestruct_t *timeDescription
The pm_start_mygroup subroutine starts the Performance Monitor counting for the calling kernel thread and the counting group to which it belongs. Counting is effective immediately for the calling thread. For all the other threads members of the counting group, the counting starts after their next redispatch, but only if their current counting state is already set to On. The counting state of a thread in a group is obtained by ANDing the thread counting state with the group state. If their counting state is currently set to Off, no counting starts until they call either the pm_start_mythread subroutine or the pm_start_mygroup subroutine themselves, or until a debugger process calls the pm_start_thread subroutine or the pm_start_group subroutine on their behalf.
The pm_tstart_mygroup subroutine starts the Performance Monitor counting for the calling kernel thread and the counting group to which it belongs, and returns a timestamp indicating when the counting was started.
Parameters
| Item | Description |
|---|---|
| *time | Pointer to a structure containing the timebase value when the counting was started. This can be converted to time using the time_base_to_time subroutine. |
Return Values
| Item | Description |
|---|---|
| 0 | Operation completed successfully. |
| Positive error code | Refer to the pm_error Subroutine to decode the error code. |
Error Codes
Refer to the pm_error Subroutine.
Files
| Item | Description |
|---|---|
| /usr/include/pmapi.h | Defines standard macros, data types, and subroutines. |