/*
   Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301  USA
*/

/*
 * hrt_stopwatch.c
 *
 */

#include <stdlib.h>
#include <assert.h>

#include "hrt_stopwatch.h"

/*
 * High-Resolution Time Stopwatch Utility -- Implementation
 */

extern void
hrt_sw_init(hrt_stopwatch* sw, int cap)
{
    sw->cap = cap;
    sw->top = 0;
    sw->tstamps = malloc(sizeof(hrt_tstamp) * cap);
}

extern void
hrt_sw_close(hrt_stopwatch* sw)
{
    free(sw->tstamps);
    sw->cap = 0;
    sw->top = 0;
}

extern int
hrt_sw_top(const hrt_stopwatch* sw)
{
    return sw->top - 1;
}

extern int
hrt_sw_capacity(const hrt_stopwatch* sw)
{
    return sw->cap;
}

extern int
hrt_sw_pushmark(hrt_stopwatch* sw)
{
    assert (sw->top < sw->cap);
    int r = hrt_tnow(sw->tstamps + sw->top);
    assert (r == 0);
    (void)r;
    return sw->top++;
}

extern void
hrt_sw_popmark(hrt_stopwatch* sw)
{
    assert (sw->top > 0);
    sw->top--;
}

extern double
hrt_sw_rtmicros(const hrt_stopwatch* sw, int y, int x)
{
    assert (0 <= y && y < sw->top);
    assert (0 <= x && x < sw->top);
    return hrt_rtmicros(&sw->tstamps[y].rtstamp, &sw->tstamps[x].rtstamp);
}

extern double
hrt_sw_ctmicros(const hrt_stopwatch* sw, int y, int x)
{
    assert (0 <= y && y < sw->top);
    assert (0 <= x && x < sw->top);
    return hrt_ctmicros(&sw->tstamps[y].ctstamp, &sw->tstamps[x].ctstamp);
}

extern void
hrt_sw_clear(hrt_stopwatch* sw)
{
    sw->top = 0;
}

