IPC进程间通信作业

#include <gsj.h>

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

int count = 0;

void *print_abc(void *arg)
{
    char id = *((char *)arg);
    for (int i = 0;; ++i)
    {
        pthread_mutex_lock(&mutex);
        while (id - 'A' != count % 3)
        {
            pthread_cond_wait(&cond, &mutex);
        }
        printf("%c\n", id);
        count++;
        pthread_cond_broadcast(&cond);
        pthread_mutex_unlock(&mutex);
    }
    pthread_exit(NULL);
}

int main()
{

    pthread_t thread_a, thread_b, thread_c;
    char id_a = 'A', id_b = 'B', id_c = 'C';

    pthread_create(&thread_a, NULL, print_abc, (void *)&id_a);
    pthread_create(&thread_b, NULL, print_abc, (void *)&id_b);
    pthread_create(&thread_c, NULL, print_abc, (void *)&id_c);

    pthread_join(thread_a, NULL);
    pthread_join(thread_b, NULL);
    pthread_join(thread_c, NULL);

    pthread_mutex_destroy(&mutex);
    pthread_cond_destroy(&cond);

    return 0;
}

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#include <gsj.h>
int main()
{
    umask(0);
    if (mkfifo("fifo1", 0664) < 0)
    {
        if (errno != 17)
        {
            perror("mkfifo");
            return -1;
        }
    }
    printf("mkfifo success\n");
    if (mkfifo("fifo2", 0664) < 0)
    {
        if (errno != 17)
        {
            perror("mkfifo");
            return -1;
        }
    }
    printf("mkfifo success\n");

    pid_t pid = fork();
	while(1){

    if (pid > 0)
    {
        int fd = open("./fifo1", O_RDONLY);
        if (fd < 0)
        {
            perror("open");
            return -1;
        }
       // printf("open rdonly fd=%d\n", fd);
        char buf[128] = "";
        ssize_t res = 0;
        while (1)
        {
            bzero(buf, sizeof(buf));
            res = read(fd, buf, sizeof(buf));
				if (res < 0)
            {
                perror("read");
                return -1;
            }
            else if (res == 0)
            {
                printf("对方进程结束\n");
                break;
            }
            printf("wr说:%s\n", buf);
            if (strcmp(buf, "quit") == 0)
                break;
        }
		close(fd);
    }
    else if (pid == 0)
    {
        int fd1 = open("./fifo2", O_WRONLY);
        if (fd1 < 0)
        {
            perror("open");
            return -1;
        }
       // printf("open rdonly fd1=%d\n", fd1);
        char buf[128] = "";
        ssize_t res = 0;
        while (1)
        {
            fgets(buf, sizeof(buf), stdin);
            buf[strlen(buf) - 1] = '\0';
            if (write(fd1, buf, sizeof(buf)) < 0)
            {
                perror("write");
                return -1;
            }
            else if (res == 0)
            {
                printf("发送成功\n");
                break;
            }

            if (strcmp(buf, "quit") == 0)
                break;
        }
		close(fd1);
    }
	}
    return 0;
}

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#include <gsj.h>
int main()
{
    umask(0);
    if (mkfifo("fifo1", 0664) < 0)
    {
        if (errno != 17)
        {
            perror("mkfifo");
            return -1;
        }
    }
    printf("mkfifo success\n");
    if (mkfifo("fifo2", 0664) < 0)
    {
        if (errno != 17)
        {
            perror("mkfifo");
            return -1;
        }
    }
    printf("mkfifo success\n");
    pid_t pid = fork();
	while(1){

    if (pid > 0)
    {
        int fd = open("./fifo1", O_WRONLY);
        if (fd < 0)
        {
            perror("open");
            return -1;
        }
       // printf("open rdonly fd=%d\n", fd);
        char buf[128] = "";
        ssize_t res = 0;
        while (1)
        {
            fgets(buf, sizeof(buf), stdin);
            buf[strlen(buf) - 1] = '\0';
            if (write(fd, buf, sizeof(buf)) < 0)
            {
                perror("write");
                return -1;
            }
            else if (res == 0)
            {
                printf("发送成功\n");
                break;
            }

            if (strcmp(buf, "quit") == 0)
                break;
        }
		close(fd);
    }
    else if (pid == 0)
    {
        int fd1 = open("./fifo2", O_RDONLY);
        if (fd1 < 0)
        {
            perror("open");
            return -1;
        }
     //   printf("open rdonly fd1=%d\n", fd1);
        char buf[128] = "";
        ssize_t res = 0;
        while (1)
        {
            bzero(buf, sizeof(buf));
            res = read(fd1, buf, sizeof(buf));
				if (res < 0)
            {
                perror("read");
                return -1;
            }
            else if (res == 0)
            {
                printf("对方进程结束\n");
                break;
            }
            printf("wr说:%s\n", buf);
            if (strcmp(buf, "quit") == 0)
                break;
        }
		close(fd1);
    }
	}
    return 0;
}

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