NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO
cc [ flag... ] file... -lthread_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);
The controlling process can request the collection of certain statistics about a target process. Statistics gathering is disabled by default. Each target process has a td_ta_stats_t structure that contains 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. Statistics 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(3THR). 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 lightweight 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.
The call completed successfully.
An invalid internal process handle was passed in.
A call to one of the imported interface routines failed.
Something else went wrong.
See attributes(5) for description of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
---|---|
MT Level | Safe |
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ATTRIBUTES | SEE ALSO