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evlog - reduce overhead of getting time a little by pre-checking clock 

this checks for clock_gettime + CLOCK_MONOTONIC or CLOCK_REALTIME at
evlog init to avoid a cmp+brang and l1 instr cache hit every get.
slightly less overhead when this is on.
This commit is contained in:
Carsten Haitzler 2016-11-10 14:36:10 +09:00
parent 42ebfa863f
commit ce3685f001
1 changed files with 10 additions and 8 deletions
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18
src/lib/eina/eina_evlog.c
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@ -60,14 +60,6 @@ get_time(void)
#if defined (HAVE_CLOCK_GETTIME) || defined (EXOTIC_PROVIDE_CLOCK_GETTIME)
struct timespec t;
if (EINA_UNLIKELY(_eina_evlog_time_clock_id < 0))
{
if (!clock_gettime(CLOCK_MONOTONIC, &t))
_eina_evlog_time_clock_id = CLOCK_MONOTONIC;
else
_eina_evlog_time_clock_id = CLOCK_REALTIME;
}
if (EINA_UNLIKELY(clock_gettime(_eina_evlog_time_clock_id, &t)))
{
struct timeval timev;
@ -226,6 +218,16 @@ eina_evlog_init(void)
{
eina_spinlock_new(&_evlog_lock);
buf = &(buffers[0]);
#if defined (HAVE_CLOCK_GETTIME) || defined (EXOTIC_PROVIDE_CLOCK_GETTIME)
{
struct timespec t;
if (!clock_gettime(CLOCK_MONOTONIC, &t))
_eina_evlog_time_clock_id = CLOCK_MONOTONIC;
else
_eina_evlog_time_clock_id = CLOCK_REALTIME;
}
#endif
eina_evlog("+eina_init", NULL, 0.0, NULL);
return EINA_TRUE;
}