C sleep milliseconds

C fractional sleep

#define _DEFAULT_SOURCE
#include "newSleep.h"

void fracSleep(float sec) {
    struct timespec ts;
    ts.tv_sec = (int) sec;
    ts.tv_nsec = (sec - ((int) sec)) * 1000000000;
    nanosleep(&ts,NULL);
}

fracSleep(0.5); //Half second delay

C sleep milliseconds

#include <time.h>
#include <errno.h>    

/* msleep(): Sleep for the requested number of milliseconds. */
int msleep(long msec)
{
    struct timespec ts;
    int res;

    if (msec < 0)
    {
        errno = EINVAL;
        return -1;
    }

    ts.tv_sec = msec / 1000;
    ts.tv_nsec = (msec % 1000) * 1000000;

    do {
        res = nanosleep(&ts, &ts);
    } while (res && errno == EINTR);

    return res;
}

Source: stackoverflow.com

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