QNX实现多线程通信的示例与技术解析

在QNX操作系统中，实现多线程通信是关键的，通过消息传递实现线程之间的通信和同步。使用消息队列（Message Queue）可以实现线程间的数据传输和同步操作。这种通信方式可以保证线程间的安全性和可靠性，适用于实时嵌入式系统等场景。

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

#define MAX_MESSAGES 10
#define MAX_MSG_SIZE 256
#define QUEUE_NAME "/my_queue"

void *thread_function(void *arg) {
    mqd_t mq;
    char buffer[MAX_MSG_SIZE];

    struct mq_attr attr;
    attr.mq_flags = 0;
    attr.mq_maxmsg = MAX_MESSAGES;
    attr.mq_msgsize = MAX_MSG_SIZE;
    attr.mq_curmsgs = 0;

    mq = mq_open(QUEUE_NAME, O_RDONLY | O_CREAT, 0644, &attr);
    if (mq == -1) {
        perror("mq_open");
        exit(1);
    }

    printf("Waiting for messages...\n");
    while (1) {
        if (mq_receive(mq, buffer, MAX_MSG_SIZE, NULL) == -1) {
            perror("mq_receive");
            exit(1);
        }
        printf("Received: %s\n", buffer);
    }

    mq_close(mq);
    return NULL;
}

int main() {
    pthread_t thread_id;
    pthread_create(&thread_id, NULL, thread_function, NULL);

    mqd_t mq;
    char buffer[MAX_MSG_SIZE];

    mq = mq_open(QUEUE_NAME, O_WRONLY);
    if (mq == -1) {
        perror("mq_open");
        exit(1);
    }

    printf("Enter message to send: ");
    while (fgets(buffer, MAX_MSG_SIZE, stdin) != NULL) {
        mq_send(mq, buffer, strlen(buffer) + 1, 0);
        printf("Enter message to send: ");
    }

    mq_close(mq);
    pthread_join(thread_id, NULL);

    return 0;
}

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