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However, because the overhead is so great for a driver to attempt to figure out whether any mapped buffer might be used by a particular draw, it wasn't guaranteed that you'd actually see that error, and most drivers didn't do the check at all. In prior versions of OpenGL, it was an error to attempt to render from a buffer while that buffer was mapped.
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Possibly the most interesting of the new features introduced since OpenGL 4.3 is persistent mapped buffers, which were included with the GL_ARB_buffer_storage extension and are now part of OpenGL 4.4 and 4.5. However, these features represent the cutting edge of graphics technology at this point in 2015, OpenGL is the only way to get them. Because these extensions have become more ubiquitous, I decided to showcase them. This marks a departure from the previous edition, in which I stayed away from extensions in order to ensure the widest possible user base for the code. The book contains examples of the use of all of these features, some of which are available only on very recent hardware with up-to-date drivers that expose specific extensions.
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Over the last few months in 2015, we have heard a lot of talk about new APIs and how they enable new rendering effects and unprecedented performance. OpenGL Superbible: Comprehensive Tutorial and Reference, 7th Edition