TD_TA_ENABLE_STATS(3C_DB)TD_TA_ENABLE_STATS(3C_DB)NAME
td_ta_enable_stats, td_ta_reset_stats, td_ta_get_stats - collect target
process statistics for libc_db
SYNOPSIS
cc [ flag... ] file... -lc_db [ library... ]
#include <proc_service.h>
#include <thread_db.h>
td_err_e td_ta_enable_stats(const td_thragent_t *ta_p, int on_off);
td_err_e_stats td_ta_reset(const td_thragent_t *ta_p);
td_err_e td_ta_get_stats(const td_thragent_t *ta_p, td_ta_stats_t *tstats);
DESCRIPTION
The controlling process can request the collection of certain statis‐
tics about a target process. Statistics gathering is disabled by
default. Each target process has a td_ta_stats_t structure that con‐
tains current values when statistic gathering is enabled.
The td_ta_enable_stats() function turns statistics gathering on or off
for the process identified by ta_p, depending on whether or not on_off
is non-zero. When statistics gathering is turned on, all statistics are
implicitly reset as though td_ta_reset_stats() had been called. Sta‐
tistics are not reset when statistics gathering is turned off. Except
for nthreads and r_concurrency, the values do not change further, but
they remain available for inspection by way of td_ta_get_stats().
The td_ta_reset_stats() function resets all counters in the
td_ta_stats_t structure to zero for the target process.
The td_ta_get_stats() function returns the structure for the process in
tstats.
The td_ta_stats_t structure is defined in <thread_db.h> and contains
the following members:
typedef struct {
int nthreads; /* total number of threads in use */
int r_concurrency; /* requested concurrency level */
int nrunnable_num; /* numerator of avg runnable threads */
int nrunnable_den; /* denominator of avg runnable threads */
int a_concurrency_num; /* numerator, avg achieved concurrency */
int a_concurrency_den; /* denominator, avg achieved concurrency */
int nlwps_num; /* numerator, avg number of LWPs in use */
int nlwps_den; /* denominator, avg number of LWPs in use */
int nidle_num; /* numerator, avg number of idling LWPs */
int nidle_den; /* denominator, avg number of idling LWPs */
} td_ta_stats_t;
The nthreads member is the number of threads that are currently part of
the target process. The r_concurrency member is the current requested
concurrency level, such as would be returned by thr_setconcurrency(3C).
The remaining members are averages over time, each expressed as a
fraction with an integral numerator and denominator. The nrunnable_num
and nrunnable_den members represent the average number of runnable
threads. The a_concurrency_num and a_concurrency_den members represent
the average achieved concurrency, the number of actually running
threads. The a_concurrency_num and a_concurrency_den members are less
than or equal to nrunnable_num and nrunnable_den, respectively. The
nlwps_num and nlwps_den members represent the average number of light‐
weight processes (LWPs) participating in this process. They must be
greater than or equal to a_concurrency_num and a_concurrency_den,
respectively, since every running thread is assigned to an LWP, but
there can at times be additional idling LWPs with no thread assigned to
them. The nidle_num and nidle_den members represent the average number
of idle LWPs.
RETURN VALUES
TD_OK
The call completed successfully.
TD_BADTA
An invalid internal process handle was passed in.
TD_DBERR
A call to one of the imported interface routines failed.
TD_ERR
Something else went wrong.
ATTRIBUTES
See attributes(5) for description of the following attributes:
┌───────────────┬─────────────────┐
│ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├───────────────┼─────────────────┤
│MT Level │ Safe │
└───────────────┴─────────────────┘
SEE ALSOlibc_db(3LIB), thr_getconcurrency(3C), attributes(5)
Oct 20, 1998 TD_TA_ENABLE_STATS(3C_DB)
