pm_start_pgroup and pm_tstart_pgroup Subroutine

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Purpose

Starts Performance Monitor counting for the counting group to which a target pthread belongs.

Library

Performance Monitor APIs Library (libpmapi.a)

Syntax

#include <pmapi.h>

int pm_start_pgroup ( pid,  tid,  ptid)
pid_t pid;
tid_t tid;
ptid_t ptid;

int pm_tstart_pgroup ( pid,  tid, ptid, *time)
pid_t pid;
tid_t tid;
ptid_t ptid;
timebasestruct_t *time

Description

The pm_start_pgroup subroutine starts the Performance Monitor counting for a target pthread and the counting group to which it belongs. This counting is effective immediately for the target pthread. 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 pthread in a group is obtained by ANDing the pthread 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_pthread subroutine or the pm_start_pgroup subroutine on their behalf.

The pm_tstart_pgroup subroutine starts the Performance Monitor counting for a target pthread and the counting group to which it belongs, and returns a timestamp indicating when the counting was started.

If the pthread is running in 1:1 mode, only the tid parameter must be specified. If the pthread is running in m:n mode, only the ptid parameter must be specified. If both the ptid and tid parameters are specified, they must be referring to a single pthread with the ptid parameter specified and currently running on a kernel thread with specified tid parameter.

Parameters

Item Description
pid Process ID of target pthread. Target process must be a debuggee of the caller process.
tid Thread ID of target pthread. To ignore this parameter, set it to 0.
ptid Pthread ID of the target pthread. To ignore this parameter, set it to 0.
*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.