front_linux/LFtid1056/main_thread.cpp

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>

/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
#define THREAD_CONNECTIONS 10        // <20><><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD><DFB3><EFBFBD>
#define MONITOR_INTERVAL 1           // <20><><EFBFBD>ؼ<EFBFBD><D8BC><EFBFBD>(<28><>)

/* <20>߳<EFBFBD>״̬ö<CCAC><C3B6> */
typedef enum {
    THREAD_RUNNING,     // 0:<3A><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    THREAD_STOPPED,     // 1:<3A><><EFBFBD><EFBFBD>ֹͣ  
    THREAD_RESTARTING,  // 2:<3A><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    THREAD_CRASHED      // 3:<3A>쳣<EFBFBD><ECB3A3><EFBFBD><EFBFBD>
} thread_state_t;

/* <20>߳̿<DFB3><CCBF>ƽṹ<C6BD><E1B9B9> */
typedef struct {
    pthread_t tid;          // <20>߳<EFBFBD>ID
    int index;              // <20>̱߳<DFB3><CCB1><EFBFBD>(0~CONNECTIONS-1)
    thread_state_t state;   // <20><>ǰ״̬
    pthread_mutex_t lock;   // <20>߳<EFBFBD>ר<EFBFBD>û<EFBFBD><C3BB><EFBFBD><EFBFBD><EFBFBD>
} thread_info_t;

/* ȫ<>ֱ<EFBFBD><D6B1><EFBFBD> */
thread_info_t thread_info[THREAD_CONNECTIONS];  // <20>߳<EFBFBD><DFB3><EFBFBD>Ϣ<EFBFBD><CFA2><EFBFBD><EFBFBD>
pthread_mutex_t global_lock = PTHREAD_MUTEX_INITIALIZER;  // ȫ<>ֻ<EFBFBD><D6BB><EFBFBD><EFBFBD><EFBFBD>

/* <20>̹߳<DFB3><CCB9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳߳<DFB3>*/
void* work_thread(void* arg) {
    int index = *(int*)arg;  // <20><>ȡ<EFBFBD>߳<EFBFBD><DFB3><EFBFBD><EFBFBD><EFBFBD>
    free(arg);  // <20>ͷŶ<CDB7>̬<EFBFBD><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>

    // <20><><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>״̬Ϊ<CCAC><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    pthread_mutex_lock(&thread_info[index].lock);
    printf("Thread %d started\n", index);
    thread_info[index].state = THREAD_RUNNING;
    pthread_mutex_unlock(&thread_info[index].lock);

    // ģ<>⹤<EFBFBD><E2B9A4>ѭ<EFBFBD><D1AD>(5<><35><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
    while (1) {
        sleep(5);

        // 10%<25><><EFBFBD><EFBFBD>ģ<EFBFBD><C4A3><EFBFBD>̹߳<DFB3><CCB9><EFBFBD>
        if (rand() % 10 == 0) {
            pthread_mutex_lock(&thread_info[index].lock);
            printf("Thread %d simulated failure\n", index);
            pthread_mutex_unlock(&thread_info[index].lock);
            break;
        }
    }

    // <20>߳<EFBFBD><DFB3><EFBFBD>ֹ<EFBFBD><D6B9><EFBFBD><EFBFBD>
    pthread_mutex_lock(&thread_info[index].lock);
    thread_info[index].state = THREAD_STOPPED;
    printf("Thread %d stopped\n", index);
    pthread_mutex_unlock(&thread_info[index].lock);
    return NULL;
}
/* <20>̹߳<DFB3><CCB9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1<><31><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>*/
void* work_thread_1(void* arg) {
    int index = *(int*)arg;  // <20><>ȡ<EFBFBD>߳<EFBFBD><DFB3><EFBFBD><EFBFBD><EFBFBD>
    free(arg);  // <20>ͷŶ<CDB7>̬<EFBFBD><CCAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>

    // <20><><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>״̬Ϊ<CCAC><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    pthread_mutex_lock(&thread_info[index].lock);
    printf("work_thread_1 %d started\n", index);
    thread_info[index].state = THREAD_RUNNING;
    pthread_mutex_unlock(&thread_info[index].lock);

    // 1<><31><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD><DFB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD>
    while (1) {
        sleep(5);

        // 10%<25><><EFBFBD><EFBFBD>ģ<EFBFBD><C4A3><EFBFBD>̹߳<DFB3><CCB9><EFBFBD>
        if (rand() % 10 == 0) {
            pthread_mutex_lock(&thread_info[index].lock);
            printf("Thread %d simulated failure\n", index);
            pthread_mutex_unlock(&thread_info[index].lock);
            break;
        }
    }

    // <20>߳<EFBFBD><DFB3><EFBFBD>ֹ<EFBFBD><D6B9><EFBFBD><EFBFBD>
    pthread_mutex_lock(&thread_info[index].lock);
    thread_info[index].state = THREAD_STOPPED;
    printf("work_thread_1 %d stopped\n", index);
    pthread_mutex_unlock(&thread_info[index].lock);
    return NULL;
}
/* <20>߳<EFBFBD><DFB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
void restart_thread(int index) {
    pthread_mutex_lock(&global_lock);
    if (thread_info[index].state == THREAD_RESTARTING) {
        pthread_mutex_unlock(&global_lock);
        return;  // <20><><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><D8B8><EFBFBD><EFBFBD><EFBFBD>
    }

    thread_info[index].state = THREAD_RESTARTING;
    printf("Restarting thread %d\n", index);
    pthread_mutex_unlock(&global_lock);

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>
    int* new_index = (int*)malloc(sizeof(int));
    *new_index = index;

    if (index == 0) {
        //<2F><><EFBFBD>߳<EFBFBD>1<EFBFBD><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        if (pthread_create(&thread_info[index].tid, NULL, work_thread_1, new_index) != 0) {
            pthread_mutex_lock(&global_lock);
            printf("Failed to restart work_thread_1 %d\n", index);
            thread_info[index].state = THREAD_CRASHED;
            pthread_mutex_unlock(&global_lock);
            free(new_index);
        }
    }
    else {
        //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳߳<DFB3><CCB3><EFBFBD><EFBFBD><EFBFBD>
        if (pthread_create(&thread_info[index].tid, NULL, work_thread, new_index) != 0) {
            pthread_mutex_lock(&global_lock);
            printf("Failed to restart thread %d\n", index);
            thread_info[index].state = THREAD_CRASHED;
            pthread_mutex_unlock(&global_lock);
            free(new_index);
        }
    }
    
}

/* <20>̴߳<DFB3><CCB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
int is_thread_alive(pthread_t tid) {
    return pthread_tryjoin_np(tid, NULL) == EBUSY;  // EBUSY<53><59>ʾ<EFBFBD>߳<EFBFBD><DFB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
}

/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
int main1() {
    srand(time(NULL));  // <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>

    // <20><>ʼ<EFBFBD><CABC><EFBFBD>߳<EFBFBD><DFB3><EFBFBD><EFBFBD><EFBFBD>
    for (int i = 0; i < THREAD_CONNECTIONS; i++) {
        thread_info[i].index = i;
        thread_info[i].state = THREAD_STOPPED;
        pthread_mutex_init(&thread_info[i].lock, NULL);  // <20><>ʼ<EFBFBD><CABC>ÿ<EFBFBD><C3BF><EFBFBD>̵߳<DFB3><CCB5><EFBFBD>
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD>߳<EFBFBD><DFB3><EFBFBD>
    for (int i = 0; i < THREAD_CONNECTIONS; i++) {
        int* index = (int*)malloc(sizeof(int));
        *index = i;

        if (i == 0) {
            //<2F><><EFBFBD>߳<EFBFBD><DFB3>߳<EFBFBD>1<EFBFBD><31>
            if (pthread_create(&thread_info[i].tid, NULL, work_thread_1, index) != 0) {
                printf("Failed to create work_thread_1 %d\n", i);
                free(index);
            }
        }
        else {
            //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳߳<DFB3>
            if (pthread_create(&thread_info[i].tid, NULL, work_thread, index) != 0) {
                printf("Failed to create thread %d\n", i);
                free(index);
            }
        }
    }

    printf("Thread monitoring system started with %d workers\n", THREAD_CONNECTIONS);

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD>
    while (1) {
        sleep(MONITOR_INTERVAL);

        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>״̬
        for (int i = 0; i < THREAD_CONNECTIONS; i++) {
            pthread_mutex_lock(&thread_info[i].lock);

            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD><DFB3>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD>
            if (thread_info[i].state == THREAD_RUNNING && !is_thread_alive(thread_info[i].tid)) {
                printf("Thread %d crashed unexpectedly\n", i);
                thread_info[i].state = THREAD_CRASHED;
            }

            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>
            if (thread_info[i].state == THREAD_STOPPED || thread_info[i].state == THREAD_CRASHED) {
                pthread_mutex_unlock(&thread_info[i].lock);
                restart_thread(i);  // <20>첽<EFBFBD><ECB2BD><EFBFBD><EFBFBD>
            }
            else {
                pthread_mutex_unlock(&thread_info[i].lock);
            }
        }
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դ(<28><><EFBFBD><EFBFBD><EFBFBD>ϲ<EFBFBD><CFB2><EFBFBD>ִ<EFBFBD>е<EFBFBD><D0B5><EFBFBD><EFBFBD><EFBFBD>)
    for (int i = 0; i < THREAD_CONNECTIONS; i++) {
        pthread_mutex_destroy(&thread_info[i].lock);
    }
    return 0;
}