times.h

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/*
    This file is part of Ansel,
    Copyright (C) 2026 Aurélien PIERRE.
 
    Ansel is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    Ansel is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with Ansel.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DT_COMMON_TIMES_H
#define DT_COMMON_TIMES_H
 
/* Wall-clock / CPU-time measurement helpers. The dt_show_times* implementations
 * live in darktable.c (they honor the runtime perf-debug flag), but the
 * declarations are application-free: low-level code includes this instead of
 * darktable.h. */
 
#ifdef _WIN32
#include "win/getrusage.h"
#else
#include <sys/resource.h>
#endif
#include <sys/time.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct
{
  double clock;
  double user;
} dt_times_t;
 
static inline double dt_get_wtime(void)
{
  struct timeval time;
  gettimeofday(&time, NULL);
  return time.tv_sec - 1290608000 + (1.0 / 1000000.0) * time.tv_usec;
}
 
static inline void dt_get_times(dt_times_t *t)
{
  struct rusage ru;
 
  getrusage(RUSAGE_SELF, &ru);
  t->clock = dt_get_wtime();
  t->user = ru.ru_utime.tv_sec + ru.ru_utime.tv_usec * (1.0 / 1000000.0);
}
 
/* Wall-clock time (dt_get_wtime() domain) at which the application started.
 * Written once at startup, never mutated; implemented in darktable.c. */
double dt_get_start_wtime(void);
 
void dt_show_times(const dt_times_t *start, const char *prefix);
 
void dt_show_times_f(const dt_times_t *start, const char *prefix, const char *suffix, ...) __attribute__((format(printf, 3, 4)));
 
#ifdef __cplusplus
}
#endif
 
#endif // DT_COMMON_TIMES_H
 
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