请问在qnx6下可不可以使用unix的系统V信号灯？如果可以为什么我在编译的时候出错，提示没有定义
int semop(int semid, struct sembuf *sops, unsigned nsops)
int semget(key_t key, int nsems, int semflg)
int semctl(int semid，int semnum，int cmd，union semun arg)
的参数？好像在头文件sys/sem.h中有函数原型定义啊！是不是与内核有关呢？
盼解答。谢谢！ 
自己顶一下 
These functions are not yet implemented. You should look at the functions in <semaphore.h> instead as they are currently implemented.
You may have to switch over to the use of POSIX semaphores.
Thank you I will have a try.
谢谢你的解答liug！用POSIX标准的semaphore同样方便。