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$ nice -n -10 ./my_program

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#include <stdio.h>
#include <sched.h>

int main() {
    struct sched_param param;
    param.sched_priority = 10; // ÉèÖÃÀú³ÌµÄÓÅÏȼ¶Îª10

    if(sched_setscheduler(0, SCHED_FIFO, &param) < 0) {
        perror("sched_setscheduler");
        return -1;
    }

    while(1) {
        // Àú³ÌÖ´ÐеĴúÂë
    }

    return 0;
}

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Linux man pages

Linux Advanced Programming by Mark Mitchell, Jeffrey Oldham, and Alex Samuel

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