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/*
* Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TIME_INTERNAL_H_INCLUDED_
#define TIME_INTERNAL_H_INCLUDED_

#include "event2/event-config.h"
#include "evconfig-private.h"

#ifdef EVENT__HAVE_MACH_MACH_TIME_H
/* For mach_timebase_info */
#include <mach/mach_time.h>
#endif

#include <time.h>

#include "event2/util.h"

#ifdef __cplusplus
extern "C" {
#endif

#if defined(EVENT__HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
#define HAVE_POSIX_MONOTONIC
#elif defined(EVENT__HAVE_MACH_ABSOLUTE_TIME)
#define HAVE_MACH_MONOTONIC
#elif defined(_WIN32)
#define HAVE_WIN32_MONOTONIC
#else
#define HAVE_FALLBACK_MONOTONIC
#endif

long evutil_tv_to_msec_(const struct timeval *tv);
void evutil_usleep_(const struct timeval *tv);

#ifdef _WIN32
typedef ULONGLONG (WINAPI *ev_GetTickCount_func)(void);
#endif

struct evutil_monotonic_timer {

#ifdef HAVE_MACH_MONOTONIC
struct mach_timebase_info mach_timebase_units;
#endif

#ifdef HAVE_POSIX_MONOTONIC
int monotonic_clock;
#endif

#ifdef HAVE_WIN32_MONOTONIC
ev_GetTickCount_func GetTickCount64_fn;
ev_GetTickCount_func GetTickCount_fn;
ev_uint64_t last_tick_count;
ev_uint64_t adjust_tick_count;

ev_uint64_t first_tick;
ev_uint64_t first_counter;
double usec_per_count;
int use_performance_counter;
#endif

struct timeval adjust_monotonic_clock;
struct timeval last_time;
};

#define EV_MONOT_PRECISE 1
#define EV_MONOT_FALLBACK 2

int evutil_configure_monotonic_time_(struct evutil_monotonic_timer *mt,
    int flags);
int evutil_gettime_monotonic_(struct evutil_monotonic_timer *mt, struct timeval *tv);


#ifdef __cplusplus
}
#endif

#endif /* EVENT_INTERNAL_H_INCLUDED_ */
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