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/* User/system CPU time clocks that follow the std::chrono interface.
Copyright (C) 2016-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
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 for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef COMMON_RUN_TIME_CLOCK_H
#define COMMON_RUN_TIME_CLOCK_H
#include <chrono>
/* Count the total amount of time spent executing in user mode. */
struct user_cpu_time_clock
{
using duration = std::chrono::microseconds;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<user_cpu_time_clock>;
static constexpr bool is_steady = true;
/* Use run_time_clock::now instead. */
static time_point now () noexcept = delete;
};
/* Count the total amount of time spent executing in kernel mode. */
struct system_cpu_time_clock
{
using duration = std::chrono::microseconds;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<system_cpu_time_clock>;
static constexpr bool is_steady = true;
/* Use run_time_clock::now instead. */
static time_point now () noexcept = delete;
};
/* Count the total amount of time spent executing in userspace+kernel
mode. */
struct run_time_clock
{
using duration = std::chrono::microseconds;
using rep = duration::rep;
using period = duration::period;
using time_point = std::chrono::time_point<run_time_clock>;
static constexpr bool is_steady = true;
static time_point now () noexcept;
/* Return the user/system time as separate time points, if
supported. If not supported, then the combined user+kernel time
is returned in USER and SYSTEM is set to zero. */
static void now (user_cpu_time_clock::time_point &user,
system_cpu_time_clock::time_point &system) noexcept;
};
#endif /* COMMON_RUN_TIME_CLOCK_H */
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