In linux, how can synchronize between 2 thread (using pthreads on linux)?
I would like, under some conditions, a thread will block itself and then later on, it will be resume by another thread. In Java, there is wait(), notify() functions. I am looking for something the same on pthreads:

I have read this, but it only has mutex, which is kind of like Java's synchronized keyword. That is not what I am looking for.
<https://computing.llnl.gov/tutorials/pthreads/#Mutexes>

Thank you.