63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
#include <stdio.h>
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#include <time.h>
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#define NANOSEC 1000000000.0
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#define MILLISEC 1000
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static struct timespec start;
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void start_timer()
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{
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printf("timer started...\n");
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clock_gettime(CLOCK_MONOTONIC, &start);
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# ifdef DEBUG_TIMER
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printf("sec=%d nsec=%d\n", start.tv_sec, start.tv_nsec);
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# endif
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}
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void set_timer(timer)
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struct timespec *timer;
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{
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clock_gettime(CLOCK_MONOTONIC, timer);
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# ifdef DEBUG_TIMER
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printf("timer: sec=%d nsec=%d orig: sec=%d nsec=%d\n",
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timer->tv_sec, timer->tv_nsec, start.tv_sec, start.tv_nsec);
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# endif
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}
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double get_timer(timer)
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struct timespec timer;
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{
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double diff;
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diff=(timer.tv_sec - start.tv_sec) + (timer.tv_nsec - start.tv_nsec) / NANOSEC;
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# ifdef DEBUG_TIMER
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printf("timer sec: %.5f\n", diff);
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# endif
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return diff;
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}
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#ifdef STANDALONE
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main(ac, av)
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int ac;
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char **av;
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{
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int delay;
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struct timespec end, tsdelay;
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if (ac != 2) {
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fprintf(stderr, "usage: %s msecs\n", *av);
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exit (1);
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}
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delay=atoi(*(av+1));
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start_timer();
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tsdelay.tv_sec=delay/MILLISEC;
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tsdelay.tv_nsec=delay%MILLISEC;
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printf("delay %d=%d:%d\n", delay, tsdelay.tv_sec, tsdelay.tv_nsec);
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nanosleep(&tsdelay, NULL);
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set_timer(&end);
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printf("Time elapsed: %.5f seconds\n", get_timer(end));
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return 0;
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}
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#endif
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