linux 优先级继承

#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>

sem_t sem;

void* low_priority_task(void* arg) {
    sem_wait(&sem); // 获取信号量
    printf("Low priority task acquired semaphore\n");
    sleep(5); // 模拟长时间占用资源
    printf("Low priority task releasing semaphore\n");
    sem_post(&sem); // 释放信号量
    return NULL;
}

void* high_priority_task(void* arg) {
    printf("High priority task trying to acquire semaphore\n");
    sem_wait(&sem); // 获取信号量
    printf("High priority task acquired semaphore\n");
    sleep(1); // 模拟短暂使用资源
    printf("High priority task releasing semaphore\n");
    sem_post(&sem); // 释放信号量
    return NULL;
}

int main() {
    sem_init(&sem, 0, 1); // 初始化信号量

    pthread_t low_pid, high_pid;

    pthread_create(&low_pid, NULL, low_priority_task, NULL);
    sleep(1); // 确保低优先级任务先启动
    pthread_create(&high_pid, NULL, high_priority_task, NULL);

    pthread_join(low_pid, NULL);
    pthread_join(high_pid, NULL);

    sem_destroy(&sem); // 销毁信号量
    return 0;
}