99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/// \file timing.cpp
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/// Utilities for handling time and timestamps.
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#include "timing.h"
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#include <sys/time.h>//for gettimeofday
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#include <time.h>//for time and nanosleep
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//emulate clock_gettime() for OSX compatibility
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#if defined(__APPLE__) || defined(__MACH__)
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#include <mach/clock.h>
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#include <mach/mach.h>
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#define CLOCK_REALTIME CALENDAR_CLOCK
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#define CLOCK_MONOTONIC SYSTEM_CLOCK
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void clock_gettime(int ign, struct timespec * ts) {
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clock_serv_t cclock;
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mach_timespec_t mts;
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host_get_clock_service(mach_host_self(), ign, &cclock);
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clock_get_time(cclock, &mts);
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mach_port_deallocate(mach_task_self(), cclock);
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ts->tv_sec = mts.tv_sec;
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ts->tv_nsec = mts.tv_nsec;
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}
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#endif
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/// Sleeps for the indicated amount of milliseconds or longer.
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/// Will not sleep if ms is negative.
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/// Will not sleep for longer than 10 minutes (600000ms).
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/// If interrupted by signal, resumes sleep until at least ms milliseconds have passed.
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/// Can be slightly off (in positive direction only) depending on OS accuracy.
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void Util::wait(int ms){
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if (ms < 0) {
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return;
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}
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if (ms > 600000) {
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ms = 600000;
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}
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long long int start = getMS();
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long long int now = start;
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while (now < start+ms){
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sleep(start+ms-now);
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now = getMS();
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}
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}
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/// Sleeps for roughly the indicated amount of milliseconds.
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/// Will not sleep if ms is negative.
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/// Will not sleep for longer than 100 seconds (100000ms).
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/// Can be interrupted early by a signal, no guarantee of minimum sleep time.
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/// Can be slightly off depending on OS accuracy.
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void Util::sleep(int ms) {
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if (ms < 0) {
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return;
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}
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if (ms > 100000) {
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ms = 100000;
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}
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struct timespec T;
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T.tv_sec = ms / 1000;
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T.tv_nsec = 1000000 * (ms % 1000);
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nanosleep(&T, 0);
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}
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long long Util::getNTP() {
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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return ((((long long int)t.tv_sec) + 2208988800) << 32) + (t.tv_nsec * 4.2949);
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}
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/// Gets the current time in milliseconds.
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long long int Util::getMS() {
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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return ((long long int)t.tv_sec) * 1000 + t.tv_nsec / 1000000;
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}
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long long int Util::bootSecs() {
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struct timespec t;
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clock_gettime(CLOCK_MONOTONIC, &t);
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return t.tv_sec;
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}
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/// Gets the current time in microseconds.
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long long unsigned int Util::getMicros() {
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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return ((long long unsigned int)t.tv_sec) * 1000000 + t.tv_nsec / 1000;
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}
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/// Gets the time difference in microseconds.
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long long unsigned int Util::getMicros(long long unsigned int previous) {
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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return ((long long unsigned int)t.tv_sec) * 1000000 + t.tv_nsec / 1000 - previous;
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}
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/// Gets the amount of seconds since 01/01/1970.
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long long int Util::epoch() {
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return time(0);
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}
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