Starts Performance Monitor counting for the counting group to which a target thread belongs.
Performance Monitor APIs Library (libpmapi.a)
This subroutine supports only the 1:1 threading model. It has been superseded by the pm_start_pgroup subroutine, which supports both the 1:1 and the M:N threading models. A call to this subroutine is equivalent to a call to the pm_start_pgroup subroutine with a ptid parameter equal to 0.
The pm_start_group subroutine starts the Performance Monitor counting for a target kernel thread and the counting group to which it belongs. This counting is effective immediately for the target thread. For all the other thread members of the counting group, the counting will start 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 themselves, or until a debugger process calls the pm_start_thread subroutine or the pm_start_group subroutine on their behalf.
The pm_tstart_group subroutine starts the Performance Monitor counting for a target kernel thread and the counting group to which it belongs, and returns a timestamp indicating when the counting was started.
| Item | Description |
|---|---|
| pid | Process ID of target thread. Target process must be a debuggee of the caller process. |
| tid | Thread ID of target thread. |
| *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. |
| Item | Description |
|---|---|
| 0 | Operation completed successfully. |
| Positive error code | Refer to the pm_error Subroutine to decode the error code. |
Refer to the pm_error Subroutine.
| Item | Description |
|---|---|
| /usr/include/pmapi.h | Defines standard macros, data types, and subroutines. |