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64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
// (C) 2016 University of Bristol. See License.txt
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#ifndef _timer
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#define _timer
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#include <sys/wait.h> /* Wait for Process Termination */
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#include <sys/time.h>
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#include <time.h>
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#include "Exceptions/Exceptions.h"
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long long timeval_diff(struct timeval *start_time, struct timeval *end_time);
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double timeval_diff_in_seconds(struct timeval *start_time, struct timeval *end_time);
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long long timespec_diff(struct timespec *start_time, struct timespec *end_time);
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class Timer
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{
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public:
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Timer(clockid_t clock_id = CLOCK_MONOTONIC) : running(false), elapsed_time(0), clock_id(clock_id)
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{ clock_gettime(clock_id, &startv); }
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Timer& start();
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void stop();
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double elapsed();
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double idle();
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private:
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timespec startv;
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bool running;
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long long elapsed_time;
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clockid_t clock_id;
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long long elapsed_since_last_start();
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};
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inline Timer& Timer::start()
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{
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if (running)
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throw Processor_Error("Timer already running.");
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// clock() is not suitable in threaded programs so time using something else
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clock_gettime(clock_id, &startv);
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running = true;
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return *this;
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}
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inline void Timer::stop()
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{
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if (!running)
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throw Processor_Error("Time not running.");
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elapsed_time += elapsed_since_last_start();
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running = false;
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clock_gettime(clock_id, &startv);
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}
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inline long long Timer::elapsed_since_last_start()
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{
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timespec endv;
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clock_gettime(clock_id, &endv);
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return timespec_diff(&startv, &endv);
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}
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#endif
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