两个简单的消息队列发送和接受的例子：

send.c:

#include 
     
       #include 
      
        #include 
       
         #include 
        
          int main() {
        mqd_t mqd; struct mq_attr attr; int flags;     flags = O_RDWR | O_CREAT;     mqd = mq_open("/temp.1234",flags,S_IRUSR|S_IWUSR|S_IROTH|S_IWOTH,NULL);     mq_getattr(mqd,&attr);     mq_send(mqd,"abc",3,0);     mq_close(mqd);     exit(0); }
        
       
      
     

recv.c

#include 
     
       #include 
      
        #include 
       
         #include 
        
          int main() {
        mqd_t mqd; struct mq_attr attr; char*buff;     unsigned prio;     ssize_t n; int flags;     flags = O_RDWR | O_CREAT;     mqd = mq_open("/temp.1234",flags,S_IRUSR|S_IWUSR|S_IROTH|S_IWOTH,NULL);     mq_getattr(mqd,&attr);     buff = malloc(attr.mq_msgsize);     n = mq_receive(mqd,buff,attr.mq_msgsize,&prio);     printf("%ld b, %s ,pri = %u\n",(long)n,buff,prio);     mq_close(mqd);     exit(0); }
        
       
      
     

linux下编译运行：

gcc -o send send.c -lrt

gcc -o recv recv.c -lrt

./send

./recv

输出：

3 b, abc ,pri = 0