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timer.cpp
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149 lines (123 loc) · 3.22 KB
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/**
* Copyright (C) 2016 Turi
* All rights reserved.
*
* This software may be modified and distributed under the terms
* of the BSD license. See the LICENSE file for details.
*/
/**
* Copyright (c) 2009 Carnegie Mellon University.
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an "AS
* IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*
* For more about this software visit:
*
* http://www.graphlab.ml.cmu.edu
*
*/
#include <iostream>
#include <signal.h>
#include <sys/time.h>
#include <boost/bind.hpp>
#include <parallel/pthread_tools.hpp>
#include <timer/timer.hpp>
std::ostream& operator<<(std::ostream& out, const graphlab::timer& t) {
return out << t.current_time();
}
namespace graphlab {
class hundredms_timer {
thread timer_thread;
public:
hundredms_timer() {
stop = false;
ti.start();
timer_thread.launch(boost::bind(&hundredms_timer::alarm_thread, this));
}
size_t ctr;
timer ti;
mutex lock;
conditional cond;
bool stop;
void alarm_thread() {
lock.lock();
while(!stop) {
cond.timedwait_ms(lock, 50);
double realtime = ti.current_time() ;
ctr = (size_t)(realtime * 10);
}
lock.unlock();
}
void stop_timer() {
if (stop == false) {
lock.lock();
stop = true;
cond.signal();
lock.unlock();
timer_thread.join();
}
}
~hundredms_timer() {
stop_timer();
}
};
static hundredms_timer& get_hms_timer() {
static hundredms_timer hmstimer;
return hmstimer;
}
/**
* Precision of deciseconds
*/
float timer::approx_time_seconds() {
return float(get_hms_timer().ctr) / 10;
}
/**
* Precision of deciseconds
*/
size_t timer::approx_time_millis() {
return get_hms_timer().ctr * 100;
}
void timer::stop_approx_timer() {
get_hms_timer().stop_timer();
}
void timer::sleep(size_t sleeplen) {
struct timespec timeout;
timeout.tv_sec = sleeplen;
timeout.tv_nsec = 0;
while (nanosleep(&timeout, &timeout) == -1);
}
/**
Sleeps for sleeplen milliseconds.
*/
void timer::sleep_ms(size_t sleeplen) {
struct timespec timeout;
timeout.tv_sec = sleeplen / 1000;
timeout.tv_nsec = (sleeplen % 1000) * 1000000;
while (nanosleep(&timeout, &timeout) == -1);
}
static unsigned long long rtdsc_ticks_per_sec = 0;
static mutex rtdsc_ticks_per_sec_mutex;
unsigned long long estimate_ticks_per_second() {
if (rtdsc_ticks_per_sec == 0) {
rtdsc_ticks_per_sec_mutex.lock();
if (rtdsc_ticks_per_sec == 0) {
unsigned long long tstart = rdtsc();
graphlab::timer::sleep(1);
unsigned long long tend = rdtsc();
rtdsc_ticks_per_sec = tend - tstart;
}
rtdsc_ticks_per_sec_mutex.unlock();
}
return rtdsc_ticks_per_sec;
}
}