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qbutil.h(3) | libqb | qbutil.h(3) |
NAME¶
qbutil.h -SYNOPSIS¶
#include <pthread.h>Defines¶
#define QB_UTIL_SW_OVERWRITE 0x01
Typedefs¶
typedef struct qb_thread_lock_s qb_thread_lock_t
Enumerations¶
enum qb_thread_lock_type_t { QB_THREAD_LOCK_SHORT, QB_THREAD_LOCK_LONG }
Functions¶
qb_thread_lock_t * qb_thread_lock_create (qb_thread_lock_type_t type)
Detailed Description¶
Author:Angus Salkeld <asalkeld@redhat.com>
These are some convience functions used throughout libqb.
Locking
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- qb_thread_lock_create()
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- qb_thread_lock()
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- qb_thread_trylock()
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- qb_thread_unlock()
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- qb_thread_lock_destroy()
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- qb_timespec_add_ms()
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- qb_util_nano_current_get()
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- qb_util_nano_monotonic_hz()
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- qb_util_nano_from_epoch_get()
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- qb_util_timespec_from_epoch_get()
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);
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);
Define Documentation¶
#define QB_UTIL_SW_OVERWRITE 0x01¶
Typedef Documentation¶
typedef struct qb_thread_lock_s qb_thread_lock_t¶
typedef void(* qb_util_log_fn_t)(const char *file_name, int32_t file_line, int32_t severity, const char *msg)¶
typedef struct qb_util_stopwatch qb_util_stopwatch_t¶
Enumeration Type Documentation¶
enum qb_thread_lock_type_t¶
QB_THREAD_LOCK_SHORT is a short term lock (spinlock if available on your system) QB_THREAD_LOCK_LONG is a mutex. Enumerator:- QB_THREAD_LOCK_SHORT
- QB_THREAD_LOCK_LONG
Function Documentation¶
char* qb_strerror_r (interrnum, char *buf, size_tbuflen)¶
strerror_r replacement.int32_t qb_thread_lock (qb_thread_lock_t *tl)¶
Calls either pthread_mutex_lock() or pthread_spin_lock().qb_thread_lock_t* qb_thread_lock_create (qb_thread_lock_type_ttype)¶
Create a new lock of the given type. Parameters:type QB_THREAD_LOCK_SHORT == spinlock (where
available, else mutex) QB_THREAD_LOCK_LONG == mutex
Returns:
pointer to qb_thread_lock_type_t or NULL on error.
int32_t qb_thread_lock_destroy (qb_thread_lock_t *tl)¶
Calls either pthread_mutex_destro() or pthread_spin_destroy().int32_t qb_thread_trylock (qb_thread_lock_t *tl)¶
Calls either pthread_mutex_trylock() or pthread_spin_trylock().int32_t qb_thread_unlock (qb_thread_lock_t *tl)¶
Calls either pthread_mutex_unlock() or pthread_spin_unlock.void qb_timespec_add_ms (struct timespec *ts, int32_tms)¶
Add milliseconds onto the timespec. Parameters:ts the ts to add to
ms the amount of milliseconds to increment ts
uint64_t qb_util_nano_current_get (void)¶
Get the current number of nano secounds produced by the systems incrementing clock (CLOCK_MONOTOMIC if available).uint64_t qb_util_nano_from_epoch_get (void)¶
Get the time in nano seconds since epoch.uint64_t qb_util_nano_monotonic_hz (void)¶
Get the frequence of the clock used in qb_util_nano_current_get().void qb_util_set_log_function (qb_util_log_fn_tfn)¶
Use this function to output libqb internal log message as you wish.qb_util_stopwatch_t* qb_util_stopwatch_create (void)¶
Create a Stopwatch (to time operations)void qb_util_stopwatch_free (qb_util_stopwatch_t *sw)¶
Free the stopwatch.float qb_util_stopwatch_sec_elapsed_get (qb_util_stopwatch_t *sw)¶
Get the elapsed time in seconds. (it must have been started and stopped).uint64_t qb_util_stopwatch_split (qb_util_stopwatch_t *sw)¶
Create a new time split (or lap time) Parameters:sw the stopwatch
Return values:
the relative split time in micro seconds
0 if no more splits available
int32_t qb_util_stopwatch_split_ctl (qb_util_stopwatch_t *sw, uint32_tmax_splits, uint32_toptions) Parameters:¶
sw the stopwatch
max_splits maximum number of time splits
options (0 or QB_UTIL_SW_OVERWRITE )
Return values:
0 on success
-errno on failure
uint32_t qb_util_stopwatch_split_last (qb_util_stopwatch_t *sw)¶
Get the last split index to be used by qb_util_stopwatch_time_split_get() Note:this is zero based
Parameters:
sw the stopwatch
Returns:
the last entry index
void qb_util_stopwatch_start (qb_util_stopwatch_t *sw)¶
Start the stopwatch. This also acts as a reset. Essentially it sets the starting time and clears the splits.void qb_util_stopwatch_stop (qb_util_stopwatch_t *sw)¶
Stop the stopwatch. This just allows you to get the elapsed time. So you can call this multiple times. Do not call qb_util_stopwatch_start() unless you want to reset the stopwatch.uint64_t qb_util_stopwatch_time_split_get (qb_util_stopwatch_t *sw, uint32_treceint, uint32_tolder)¶
Read the time split (in us) from 'receint' to 'older'. If older == receint then the cumulated split will be returned (from the stopwatch start). Parameters:sw the stopwatch
receint split
older split
Return values:
the split time in micro seconds
0 if not a valid split
uint64_t qb_util_stopwatch_us_elapsed_get (qb_util_stopwatch_t *sw)¶
Get the elapsed time in micro seconds. (it must have been started and stopped).void qb_util_timespec_from_epoch_get (struct timespec *ts)¶
Get the time in timespec since epoch. Parameters:ts (out) the timespec
Returns:
status (0 == ok, -errno on error)
Author¶
Generated automatically by Doxygen for libqb from the source code.Tue Apr 3 2012 | Version 0.11.1 |