I'm seeing many replies, so I'll try to write an all-in-one answer to
satisfy the curiosity.

First, more important, the incompatibility is *only* technique and not
personal. You can notice it through the following lines.

Yesterday. I have a REPL and I start to write a kind of `scsynth' in
Common Lisp. It is only to start something from scratch.

I optimize some simple dsp for sbcl, with macro and type-declarations.
Super fast.

PortAudio library and a separate thread for RT.

FIFO lock-free for the communications between NRT and RT
(only `compare-and-swap' in sbcl for the time being).

Memory pool in lisp for the nodes of the graph. Memory alloc/deallc for
the buffers only in NRT with CFFI (so the malloc of C). The original gc
only for the rest of NRT stuff. No memory (de)alloc in the RT-thread.
In general, no locks in the RT thread.

It is only the first stage, a way to start.

I use a scheduler (Earliest deadline first algo) written in C some
years ago (but not used). Integer-hash for the number of the nodes.

After 4 hours (!!) I hear oscillators and noises in RT (low latency)
and the cpu thinks that the computer is in standby.

Some lines of code and rendering off-line thanks to libsndfile
(but event-scheduling NRT is todo).

Of course, all this is raw and to rewrite.

Provisional target:

  - synthesize sounds rt and nrt
  - live coding and dsp on the fly
  - dsp library in CL

I hope months and not years.

tito

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