多项选择题
A.send B.sendto C.recv D.recvfrom
A.pthread_init B.pthread_attr_create C.pthread_attr_destroy D.pthread_attr_init
A.pthread_self B.pthread_pause C.pthread_join D.pthread_exit
A.exit B.pthread_quit C.pthread_exit D.return
A.shminit B.seminit C.semget D.shmget
A.msgget B.msginit C.msgcreate D.msg