SharedObject::someMethodThatWaits() {
    lock.acquire();

// Read and/or write shared state here.

    while (!testOnSharedState()) {
        cv.wait(&lock);
    }
    assert(testOnSharedState());

// Read and/or write shared state here.

    lock.release();
}

SharedObject::someMethodThatSignals() {
    lock.acquire();

// Read and/or write shared state here.
    
// If state has changed in a way that 
// could allow another thread to make 
// progress, signal (or broadcast).

    cv.signal();

    lock.release();
}