linux c设置线程优先级

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

void* thread_func(void* arg) {
    printf("Thread is running with priority %d\n", sched_getscheduler(0));
    return NULL;
}

int main() {
    pthread_t thread;
    struct sched_param param;

    // 创建线程
    if (pthread_create(&thread, NULL, thread_func, NULL) != 0) {
        perror("pthread_create");
        return 1;
    }

    // 设置线程优先级为最高（99）
    param.sched_priority = 99;
    if (pthread_setschedparam(thread, SCHED_FIFO, &param) != 0) {
        perror("pthread_setschedparam");
        return 1;
    }

    // 等待线程结束
    pthread_join(thread, NULL);

    return 0;
}

if (pthread_setschedparam(thread, SCHED_FIFO, &param) != 0) {
    perror("pthread_setschedparam");
    // 检查错误码
    int err = errno;
    if (err == EPERM) {
        printf("Permission denied. Try running as root.\n");
    } else if (err == EINVAL) {
        printf("Invalid priority or scheduling policy.\n");
    }
    return 1;
}