Hello, I'm looking for a way to use pthread rwlock structure with conditions routines in C++.

I have two questions:

First: How is it possible and if we can't, why ?

Second: Why current POSIX pthread have not implemented this behaviour ?

To understand my purpose, I explain what will be my use: I've a producer-consumer model dealing with one shared array. The consumer will cond_wait when the array is empty, but rdlock when reading some elems. The producer will wrlock when adding(+signal) or removing elems from the array.

The benefit of using rdlock instead of mutex_lock is to improve performance: when using mutex_lock, several readers would block, whereas using rdlock several readers would not block.