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QBUTIL.H(3) libqb Programmer's Manual QBUTIL.H(3)

NAME

qbutil.h - These are some convience functions used throughout libqb.

SYNOPSIS

#include <qb/qbutil.h>

DESCRIPTION

Locking

Time functions

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

qb_util_nano_current_get(3), qb_util_stopwatch_stop(3), qb_util_stopwatch_split(3), qb_util_stopwatch_split_ctl(3), qb_thread_unlock(3), qb_strerror_r(3), qb_util_stopwatch_time_split_get(3), qb_util_set_log_function(3), qb_util_timespec_from_epoch_get(3), qb_thread_lock_destroy(3), qb_thread_trylock(3), qb_util_nano_monotonic_hz(3), qb_util_nano_from_epoch_get(3), qb_util_stopwatch_create(3), qb_util_stopwatch_split_last(3), qb_thread_lock(3), qb_util_stopwatch_free(3), qb_thread_lock_create(3), qb_timespec_add_ms(3), qb_util_stopwatch_start(3), qb_util_stopwatch_us_elapsed_get(3), qb_util_stopwatch_sec_elapsed_get(3)

COPYRIGHT

Copyright (C) 2010-2020 Red Hat, Inc.
2020-12-03 LIBQB