linux进程线程的区别与联系

#include <stdio.h>
#include <unistd.h>

int main() {
    pid_t pid = fork();
    if (pid == 0) {
        printf("I am the child process\n");
    } else if (pid > 0) {
        printf("I am the parent process\n");
    } else {
        perror("fork");
    }
    return 0;
}

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

void* thread_function(void* arg) {
    printf("I am a thread\n");
    return NULL;
}

int main() {
    pthread_t thread;
    if (pthread_create(&thread, NULL, thread_function, NULL) != 0) {
        perror("pthread_create");
        return 1;
    }
    pthread_join(thread, NULL);
    printf("Thread finished\n");
    return 0;
}

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

int shared_data = 0;
pthread_mutex_t mutex;

void* thread_function(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_function, 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;
}