man pthread_mutex_lock，man pthread_cond_wait没文档的解决办法

wigewige@ubuntu:~/share/develop/kandao/hisi/yak/KD-Hisi3519v101-SRC/mpp_big-little/sample/kdhi_camera$ sudo apt-get install manpages-posix-dev

参考

http://blog.youkuaiyun.com/a_ran/article/details/38795117