/* sysprof-clock.h
 *
 * Copyright 2016-2019 Christian Hergert <chergert@redhat.com>
 *
 * 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.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * and contributor hereby grants to those receiving rights under this license
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 * irrevocable (except for failure to satisfy the conditions of this license)
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#pragma once

#include <stdint.h>
#include <time.h>

#include "sysprof-macros.h"
#include "sysprof-version-macros.h"

SYSPROF_BEGIN_DECLS

typedef int SysprofClock;
typedef int64_t SysprofTimeStamp;
typedef int32_t SysprofTimeSysprofan;

#define SYSPROF_NSEC_PER_SEC SYSPROF_INT64_CONSTANT(1000000000)

SYSPROF_AVAILABLE_IN_ALL
SysprofClock sysprof_clock;

static inline SysprofTimeStamp
sysprof_clock_get_current_time (void)
{
  struct timespec ts;
  SysprofClock clock = sysprof_clock;

  if SYSPROF_UNLIKELY (clock == -1)
#ifdef __APPLE__
    clock = _CLOCK_MONOTONIC;
#else
    clock = CLOCK_MONOTONIC;
#endif
  clock_gettime (clock, &ts);

  return (ts.tv_sec * SYSPROF_NSEC_PER_SEC) + ts.tv_nsec;
}

static inline SysprofTimeSysprofan
sysprof_clock_get_relative_time (SysprofTimeStamp epoch)
{
  return sysprof_clock_get_current_time () - epoch;
}

SYSPROF_AVAILABLE_IN_ALL
void sysprof_clock_init (void);

SYSPROF_END_DECLS