消息队列java代码 java消息队列应用场景( 三 )


{
fprintf(stderr, "msgrcv failed with errno: %d\n", errno);
exit(EXIT_FAILURE);
}
printf("You wrote: %s\n",data.text);
//遇到end结束
if(strncmp(data.text, "end", 3) == 0)
running = 0;
}
//删除消息队列
if(msgctl(msgid, IPC_RMID, 0) == -1)
{
fprintf(stderr, "msgctl(IPC_RMID) failed\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
发送信息的程序的源文件msgsend.c的源代码为:
#include unistd.h
#include stdlib.h
#include stdio.h
#include string.h
#include sys/msg.h
#include errno.h
#define MAX_TEXT 512
struct msg_st
{
long int msg_type;
char text[MAX_TEXT];
};
int main()
{
int running = 1;
struct msg_st data;
char buffer[BUFSIZ];
int msgid = -1;
//建立消息队列
msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
if(msgid == -1)
{
fprintf(stderr, "msgget failed with error: %d\n", errno);
exit(EXIT_FAILURE);
}
//向消息队列中写消息,直到写入end
while(running)
{
//输入数据
printf("Enter some text: ");
fgets(buffer, BUFSIZ, stdin);
data.msg_type = 1;//注意2
strcpy(data.text, buffer);
//向队列发送数据
if(msgsnd(msgid, (void*)data, MAX_TEXT, 0) == -1)
{
fprintf(stderr, "msgsnd failed\n");
exit(EXIT_FAILURE);
}
//输入end结束输入
if(strncmp(buffer, "end", 3) == 0)
running = 0;
sleep(1);
}
exit(EXIT_SUCCESS);
}
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