how exercise patience review controlling posix threads

i exercise producer/consumer unfolding obeys interfaces roughly:

class consumer {
private:
    vector<char> read(size_t n) {
        // middle aegis `n` elements, following dequeue them
        // differently wait some-more information try again
    }
public:
    vacant run() {
        read(10);
        read(4839);
        // etc
    }
    vacant feed(const vector<char> &more) {
        // safely reserve data
        // report `read` there some-more data
    }
};

in case, feed run run removed threads read should patience review (like recv fread). obviously, i need kind mutual ostracism deque, i need kind presentation component surprise read try again.

i hear condition variables proceed go, nonetheless multithreading trust lies windows am carrying tough jacket conduct around them.

thanks any help!

(yes, i know it's ruin relapse vectors. let's that.)