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name : sysprof-clock.h
 /* 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.
 *
 * 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.
 *
 * Subject to the terms and conditions of this license, each copyright holder
 * and contributor hereby grants to those receiving rights under this license
 * a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
 * irrevocable (except for failure to satisfy the conditions of this license)
 * patent license to make, have made, use, offer to sell, sell, import, and
 * otherwise transfer this software, where such license applies only to those
 * patent claims, already acquired or hereafter acquired, licensable by such
 * copyright holder or contributor that are necessarily infringed by:
 *
 * (a) their Contribution(s) (the licensed copyrights of copyright holders
 *     and non-copyrightable additions of contributors, in source or binary
 *     form) alone; or
 *
 * (b) combination of their Contribution(s) with the work of authorship to
 *     which such Contribution(s) was added by such copyright holder or
 *     contributor, if, at the time the Contribution is added, such addition
 *     causes such combination to be necessarily infringed. The patent license
 *     shall not apply to any other combinations which include the
 *     Contribution.
 *
 * Except as expressly stated above, no rights or licenses from any copyright
 * holder or contributor is granted under this license, whether expressly, by
 * implication, estoppel or otherwise.
 *
 * DISCLAIMER
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDERS OR
 * CONTRIBUTORS 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.
 *
 * SPDX-License-Identifier: BSD-2-Clause-Patent
 */

#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
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