q_receive
__q_receive
syncobj_wait_grant
monitor_wait_grant
threadobj_cond_wait
pthread_cond_wait,消息队列阻塞在此
q_send
__q_send_inner
list_append,将节点加入队列链表中
syncobj_grant_to
monitor_grant
threadobj_cond_signal,向条件变量发送信号