linux多线程课程设计报告

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

int shared_data = 0;
pthread_mutex_t mutex;

void* thread_func(void* arg) {
    pthread_mutex_lock(&mutex);
    shared_data++;
    pthread_mutex_unlock(&mutex);
    return NULL;
}

int main() {
    pthread_t threads[10];
    pthread_mutex_init(&mutex, NULL);
    for (int i = 0; i < 10; ++i) {
        pthread_create(&threads[i], NULL, thread_func, NULL);
    }
    for (int i = 0; i < 10; ++i) {
        pthread_join(threads[i], NULL);
    }
    printf("Shared data: %d\n", shared_data);
    pthread_mutex_destroy(&mutex);
    return 0;
}

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

pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;

void* thread1_func(void* arg) {
    pthread_mutex_lock(&mutex1);
    pthread_mutex_lock(&mutex2);
    // Do work
    pthread_mutex_unlock(&mutex2);
    pthread_mutex_unlock(&mutex1);
    return NULL;
}

void* thread2_func(void* arg) {
    pthread_mutex_lock(&mutex1); // 修改为先锁mutex1
    pthread_mutex_lock(&mutex2);
    // Do work
    pthread_mutex_unlock(&mutex2);
    pthread_mutex_unlock(&mutex1);
    return NULL;
}

int main() {
    pthread_t threads[2];
    pthread_create(&threads[0], NULL, thread1_func, NULL);
    pthread_create(&threads[1], NULL, thread2_func, NULL);
    for (int i = 0; i < 2; ++i) {
        pthread_join(threads[i], NULL);
    }
    return 0;
}