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improvement to timer_res, allows multiple calls

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This was SVN commit r595.
This commit is contained in:
janwas
2004-06-24 00:41:29 +00:00
parent cc02e9ea97
commit 2b7491d159
1 changed files with 16 additions and 7 deletions
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source/lib/timer.cpp
+16 -7
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@@ -74,22 +74,31 @@ double get_time()
double timer_res()
{
// may take a while to determine, so cache it
static double cached_res;
if(cached_res != 0.0)
return cached_res;
double res;
#ifdef HAVE_CLOCK_GETTIME
struct timespec res;
clock_getres(CLOCK_REALTIME, &res);
return res.tv_nsec * 1e-9;
struct timespec ts;
clock_getres(CLOCK_REALTIME, &ts);
res = ts.tv_nsec * 1e-9;
#else
double t0, t1, t2;
t0 = get_time();
const double t0 = get_time();
double t1, t2;
do t1 = get_time(); while(t1 == t0);
do t2 = get_time(); while(t2 == t1);
return t2-t1;
res = t2-t1;
#endif
cached_res = res;
return res;
}