Common Utilities

Author

Angus Salkeld asalk.nosp@m.eld@.nosp@m.redha.nosp@m.t.co.nosp@m.m

These are some convience functions used throughout libqb.

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