stopwatch.h

/* MLPACK 0.2
 *
 * Copyright (c) 2008, 2009 Alexander Gray,
 *                          Garry Boyer,
 *                          Ryan Riegel,
 *                          Nikolaos Vasiloglou,
 *                          Dongryeol Lee,
 *                          Chip Mappus, 
 *                          Nishant Mehta,
 *                          Hua Ouyang,
 *                          Parikshit Ram,
 *                          Long Tran,
 *                          Wee Chin Wong
 *
 * Copyright (c) 2008, 2009 Georgia Institute of Technology
 *
 * This program 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 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */
#ifndef FX_TIMER_H
#define FX_TIMER_H

#include "fastlib/base/common.h"

#include <sys/times.h>

EXTERN_C_BEGIN

typedef uint64 tsc_t;
#define LTSC L64
/* #define LT L64 */

/* TODO: Check x86_64 and other architectures */

#if defined(__i386__)

#define RDTSC(tscv) __asm__ volatile (".byte 0x0f, 0x31" : "=A" (tscv))
#define HAVE_RDTSC
#endif

struct timestamp {
  tsc_t micros;
#ifdef HAVE_RDTSC

  tsc_t cycles;
#endif

  struct tms cpu;
};

struct stopwatch {
  struct timestamp total;
  struct timestamp start;
};

void timestamp_init(struct timestamp *snapshot);
void timestamp_add(struct timestamp *dest, const struct timestamp *src);
void timestamp_sub(struct timestamp *dest, const struct timestamp *src);
void timestamp_now(struct timestamp *dest);
void timestamp_now_rev(struct timestamp *dest);

void stopwatch_init(struct stopwatch *timer);
void stopwatch_start(struct stopwatch *timer);
void stopwatch_stop(struct stopwatch *timer, const struct timestamp *now);

#define STOPWATCH_ACTIVE(timer) ((timer)->start.micros != 0)

EXTERN_C_END

#endif