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/* Copyright (c) 2007-2014 Massachusetts Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "nlopt-util.h"
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if defined(_WIN32) || defined(__WIN32__)
# include <windows.h>
#endif
/* return time in seconds since some arbitrary point in the past */
double nlopt_seconds(void)
{
static THREADLOCAL int start_inited = 0; /* whether start time has been initialized */
#if defined(HAVE_GETTIMEOFDAY)
static THREADLOCAL struct timeval start;
struct timeval tv;
if (!start_inited) {
start_inited = 1;
gettimeofday(&start, NULL);
}
gettimeofday(&tv, NULL);
return (tv.tv_sec - start.tv_sec) + 1.e-6 * (tv.tv_usec - start.tv_usec);
#elif defined(HAVE_TIME)
return time(NULL);
#elif defined(_WIN32) || defined(__WIN32__)
static THREADLOCAL ULONGLONG start;
FILETIME ft;
if (!start_inited) {
start_inited = 1;
GetSystemTimeAsFileTime(&ft);
start = (((ULONGLONG) ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
}
GetSystemTimeAsFileTime(&ft);
return 100e-9 * (((((ULONGLONG) ft.dwHighDateTime) << 32) + ft.dwLowDateTime) - start);
#else
/* use clock() as a fallback... this is somewhat annoying
because clock() may wrap around with a fairly short period */
static THREADLOCAL clock_t start;
if (!start_inited) {
start_inited = 1;
start = clock();
}
return (clock() - start) * 1.0 / CLOCKS_PER_SEC;
#endif
}
/* number based on time for use as random seed */
unsigned long nlopt_time_seed(void)
{
#if defined(HAVE_GETTIMEOFDAY)
struct timeval tv;
gettimeofday(&tv, NULL);
return (tv.tv_sec ^ tv.tv_usec);
#elif defined(HAVE_TIME)
return time(NULL);
#elif defined(_WIN32) || defined(__WIN32__)
FILETIME ft;
GetSystemTimeAsFileTime(&ft);
return ft.dwHighDateTime ^ ft.dwLowDateTime;
#else
return clock();
#endif
}
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