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/* sysprof-clock.c
*
* 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
*/
#include "config.h"
#include <assert.h>
#include <stdbool.h>
#include "sysprof-clock.h"
#include "sysprof-macros-internal.h"
int sysprof_clock = -1;
void
sysprof_clock_init (void)
{
static const int clock_ids[] = {
#ifdef __APPLE__
_CLOCK_MONOTONIC,
#else
CLOCK_MONOTONIC,
#endif
#ifdef __linux__
CLOCK_MONOTONIC_RAW,
CLOCK_MONOTONIC_COARSE,
CLOCK_REALTIME_COARSE,
#endif
CLOCK_REALTIME,
};
if (sysprof_clock != -1)
return;
for (unsigned int i = 0; i < SYSPROF_N_ELEMENTS (clock_ids); i++)
{
struct timespec ts;
int clock_id = clock_ids [i];
if (0 == clock_gettime (clock_id, &ts))
{
sysprof_clock = clock_id;
return;
}
}
sysprof_assert_not_reached ();
}
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