Common Utilities

These are some convience functions used throughout libqb.

Author:

Angus Salkeld <asalkeld@redhat.com>

Locking

• qb_thread_lock_create()
• qb_thread_lock()
• qb_thread_trylock()
• qb_thread_unlock()
• qb_thread_lock_destroy()

Time functions

• qb_timespec_add_ms()
• qb_util_nano_current_get()
• qb_util_nano_monotonic_hz()
• qb_util_nano_from_epoch_get()
• qb_util_timespec_from_epoch_get()

Basic Stopwatch

 uint64_t elapsed1;
 uint64_t elapsed2;
 qb_util_stopwatch_t *sw = qb_util_stopwatch_create();

 qb_util_stopwatch_start(sw);

 usleep(sometime);
 qb_util_stopwatch_stop(sw);
 elapsed1 = qb_util_stopwatch_us_elapsed_get(sw);

 usleep(somemoretime);
 qb_util_stopwatch_stop(sw);
 elapsed2 = qb_util_stopwatch_us_elapsed_get(sw);

 qb_util_stopwatch_free(sw);

Stopwatch with splits

Setup a stopwatch with space for 3 splits.

 uint64_t split;
 qb_util_stopwatch_t *sw = qb_util_stopwatch_create();

 qb_util_stopwatch_split_ctl(sw, 3, 0);
 qb_util_stopwatch_start(sw);

 usleep(sometime);
 qb_util_stopwatch_split(sw);

 usleep(somemoretime);
 qb_util_stopwatch_split(sw);

 usleep(somemoretime);
 qb_util_stopwatch_split(sw);

 idx = qb_util_stopwatch_split_last(sw);
 do {
      split = qb_util_stopwatch_time_split_get(sw, idx, idx);
      qb_log(LOG_INFO, "split %d is %"PRIu64"", last, split);
      idx--;
 } while (split > 0);

 split = qb_util_stopwatch_time_split_get(sw, 2, 1);
 qb_log(LOG_INFO, "time between second and third split is %"PRIu64"", split);

 qb_util_stopwatch_free(sw);

See also:

qbutil.h