sem_wait()/post() Vs. pthread_cond_wait()/broadcast()
 

What are advantages/disadvantages of using

sem_wait() and sem_post() instead of
pthread_cond_wait() and pthread_cond_broadcast()

for sincronizing pthreads?

I guess but please correct me:

Advantages:
(1) sem_wait()/post() are more flexible and do not need to be surrounded by mutex lock/unlock
(2) as a consequence sem_wait() can be used inside signal handlers or async call backs (pthread_cond need pthread_mutex which is not signal handler safe)

Disadvantages:
(1) sem_wait()/post() are slower? How much slower?