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![Tom](/assets/img/avatar_default.png)
This implements a number of changes related to time: * If a HPET is present, it is now used only as a system timer, unless the Local APIC timer is used (in which case the HPET timer will not trigger any interrupts at all). * If a HPET is present, the current time can now be as accurate as the chip can be, independently from the system timer. We now query the HPET main counter for the current time in CPU #0's system timer interrupt, and use that as a base line. If a high precision time is queried, that base line is used in combination with quering the HPET timer directly, which should give a much more accurate time stamp at the expense of more overhead. For faster time stamps, the more coarse value based on the last interrupt will be returned. This also means that any missed interrupts should not cause the time to drift. * The default system interrupt rate is reduced to about 250 per second. * Fix calculation of Thread CPU usage by using the amount of ticks they used rather than the number of times a context switch happened. * Implement CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE and use it for most cases where precise timestamps are not needed.
173 lines
5.7 KiB
C++
173 lines
5.7 KiB
C++
/*
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* Copyright (c) 2020, Sahan Fernando <sahan.h.fernando@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/Time.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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static int opt_interval = 2;
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static bool flag_noheader = false;
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static bool flag_beep_on_fail = false;
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static volatile int exit_code = 0;
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static volatile pid_t child_pid = -1;
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static String build_header_string(const Vector<const char*>& command, const struct timeval& interval)
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{
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StringBuilder builder;
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builder.appendf("Every %d", interval.tv_sec);
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builder.appendf(".%ds: \x1b[1m", interval.tv_usec / 100000);
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builder.join(' ', command);
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builder.append("\x1b[0m");
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return builder.build();
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}
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static struct timeval get_current_time()
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{
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struct timespec ts;
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struct timeval tv;
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clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
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timespec_to_timeval(ts, tv);
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return tv;
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}
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static int64_t usecs_from(const struct timeval& start, const struct timeval& end)
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{
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struct timeval diff;
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timeval_sub(end, start, diff);
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return 1000000 * diff.tv_sec + diff.tv_usec;
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}
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static void handle_signal(int signal)
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{
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if (child_pid > 0) {
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if (kill(child_pid, signal) < 0) {
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perror("kill");
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}
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int status;
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if (waitpid(child_pid, &status, 0) < 0) {
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perror("waitpid");
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} else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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exit_code = 1;
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}
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}
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exit(exit_code);
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}
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static int run_command(const Vector<const char*>& command)
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{
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if ((errno = posix_spawnp(const_cast<pid_t*>(&child_pid), command[0], nullptr, nullptr, const_cast<char**>(command.data()), environ))) {
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exit_code = 1;
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perror("posix_spawn");
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return errno;
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}
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// Wait for the child to terminate, then return its exit code.
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int status;
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pid_t exited_pid;
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do {
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exited_pid = waitpid(child_pid, &status, 0);
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} while (exited_pid < 0 && errno == EINTR);
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ASSERT(exited_pid == child_pid);
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child_pid = -1;
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if (exited_pid < 0) {
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perror("waitpid");
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return 1;
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}
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if (WIFEXITED(status)) {
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return WEXITSTATUS(status);
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} else {
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return 1;
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}
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}
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int main(int argc, char** argv)
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{
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signal(SIGINT, handle_signal);
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if (pledge("stdio proc exec", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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Vector<const char*> command;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Execute a command repeatedly, and watch its output over time.");
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args_parser.add_option(opt_interval, "Amount of time between updates", "interval", 'n', "seconds");
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args_parser.add_option(flag_noheader, "Turn off the header describing the command and interval", "no-title", 't');
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args_parser.add_option(flag_beep_on_fail, "Beep if the command has a non-zero exit code", "beep", 'b');
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args_parser.add_positional_argument(command, "Command to run", "command");
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args_parser.parse(argc, argv);
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struct timeval interval;
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if (opt_interval <= 0) {
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interval = { 0, 100000 };
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} else {
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interval = { opt_interval, 0 };
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}
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auto header = build_header_string(command, interval);
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command.append(nullptr);
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auto now = get_current_time();
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auto next_run_time = now;
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while (true) {
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int usecs_to_sleep = usecs_from(now, next_run_time);
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while (usecs_to_sleep > 0) {
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usleep(usecs_to_sleep);
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now = get_current_time();
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usecs_to_sleep = usecs_from(now, next_run_time);
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}
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// Clear the screen, then reset the cursor position to the top left.
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fprintf(stderr, "\033[H\033[2J");
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// Print the header.
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if (!flag_noheader) {
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fprintf(stderr, "%s\n\n", header.characters());
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} else {
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fflush(stderr);
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}
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if (run_command(command) != 0) {
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exit_code = 1;
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if (flag_beep_on_fail) {
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fprintf(stderr, "\a");
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fflush(stderr);
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}
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}
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now = get_current_time();
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timeval_add(next_run_time, interval, next_run_time);
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if (usecs_from(now, next_run_time) < 0) {
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// The next execution is overdue, so we set next_run_time to now to prevent drift.
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next_run_time = now;
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}
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}
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}
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