DOC: muxes: add a diagram of the exchanges between muxes and outer world
Since the muxes API is far from being obvious, let's show a stream being
forwarded between two sides through muxes with their buffers and the
transport layers. The diagram is provided in .fig, .svg, .png, and .pdf.
diff --git a/doc/internals/muxes.fig b/doc/internals/muxes.fig
new file mode 100644
index 0000000..23f82e5
--- /dev/null
+++ b/doc/internals/muxes.fig
@@ -0,0 +1,402 @@
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+4 1 0 49 -1 4 14 1.5708 4 225 1365 450 825 application\001
+4 1 0 49 -1 4 14 1.5708 4 180 2820 450 9450 connection = cs->conn\001
+4 1 38 48 -1 4 12 0.0000 4 180 1230 8409 657 si_cs_io_cb\001
+4 0 0 49 -1 4 12 1.5708 4 180 2820 2850 3225 mux->subscribe(SUB_RECV)\001
+4 1 0 46 -1 4 16 1.5708 4 210 750 3600 4200 rxbuf\001
+4 1 0 46 -1 4 16 1.5708 4 210 645 4575 9375 dbuf\001
+4 1 0 49 -1 4 12 1.5708 4 195 1185 900 825 (eg: checks,\001
+4 1 0 49 -1 4 12 1.5708 4 180 1200 1125 750 stream-int)\001
+4 1 0 49 -1 4 16 0.0000 4 195 600 12300 7125 MUX\001
+4 1 0 44 -1 4 16 0.0000 4 195 960 4500 8175 DEMUX\001
+4 2 0 49 -1 4 12 0.0000 4 150 1080 3600 8100 Stream ID\001
+4 0 0 49 -1 4 12 0.0000 4 150 1080 12825 7125 Stream ID\001
+4 2 0 49 -1 4 12 0.0000 4 195 1845 3300 10125 tasklet_wakeup()\001
+4 2 0 49 -1 4 12 0.0000 4 195 1845 12150 10125 tasklet_wakeup()\001
+4 2 0 49 -1 4 12 0.0000 4 180 1590 11175 3150 mux->snd_buf()\001
+4 0 0 49 -1 4 12 0.0000 4 180 1605 3675 3225 mux->rcv_buf()\001
+4 0 0 49 -1 4 12 0.0000 4 195 2130 13425 10575 xprt->snd_buf(mbuf)\001
+4 0 0 49 -1 4 12 0.0000 4 195 2070 4725 10500 xprt->rcv_buf(dbuf)\001
+4 1 0 49 -1 4 12 0.0000 4 165 3465 8400 2100 HTX contents when mode==HTTP\001
+4 0 0 49 -1 4 12 0.0000 4 180 2430 13125 675 snd_buf() will move the\001
+4 0 0 49 -1 4 12 0.0000 4 195 2490 13125 975 buffer (zero-copy) when\001
+4 0 0 49 -1 4 12 0.0000 4 195 2595 13125 1275 the destination is empty.\001
+4 2 0 49 -1 4 12 0.0000 4 195 1845 7500 450 tasklet_wakeup()\001
+4 0 0 49 -1 4 12 0.0000 4 195 1845 9300 450 tasklet_wakeup()\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 9534 4200 encode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 11325 4200 encode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 13134 4200 encode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 15009 4200 encode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 1725 5250 decode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 3525 5250 decode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 5325 5250 decode\001
+4 1 38 48 -1 4 12 0.0000 4 165 735 7200 5250 decode\001
+4 1 38 48 -1 4 12 0.0000 4 180 1155 12375 9300 mux_io_cb\001
+4 0 0 49 -1 4 12 1.5708 4 180 2835 12075 3225 mux->subscribe(SUB_SEND)\001
+4 1 0 49 -1 4 14 1.5708 4 165 1605 450 4500 mux streams\001
+4 1 0 49 -1 4 14 1.5708 4 150 2145 450 6750 mux=conn->mux\001
+4 1 0 49 -1 4 14 1.5708 4 180 1590 450 2550 conn_stream\001
+4 0 0 49 -1 4 12 0.0000 4 150 660 12900 75 Notes:\001
+4 0 0 49 -1 4 12 0.0000 4 180 2175 12975 375 - mux->rcv_buf() and\001
+4 0 0 49 -1 4 12 0.0000 4 195 2475 12975 1650 - the application is also\001
+4 0 0 49 -1 4 12 0.0000 4 195 2655 13125 1950 called the data layer and\001
+4 0 0 49 -1 4 12 0.0000 4 180 2925 13125 2250 is cs->data and cs->data_cb\001
+4 0 0 49 -1 4 12 0.0000 4 195 2940 12975 2550 - transport layers (xprt) are\001
+4 0 0 49 -1 4 12 0.0000 4 195 2520 13125 2775 stackable. conn->xprt is\001
+4 0 0 49 -1 4 12 0.0000 4 195 1770 13125 3000 the topmost one.\001
+4 1 0 49 -1 4 18 0.0000 4 270 1410 4500 11175 Transport\001
+4 1 0 46 -1 4 16 0.0000 4 210 735 14625 8175 mbuf\001
+4 1 38 48 -1 4 12 0.0000 4 180 1155 3159 9300 mux_io_cb\001
+4 0 0 49 -1 4 12 0.0000 4 195 2910 2250 12000 encoding/decoding function\001
+4 0 0 49 -1 4 12 0.0000 4 195 1635 2250 12525 transport layer\001
+4 0 0 49 -1 4 12 0.0000 4 195 2730 7050 12525 multiplexer (MUX/DEMUX)\001
+4 0 0 49 -1 4 12 0.0000 4 195 2895 7050 12000 general processing function\001
+4 0 0 49 -1 4 12 0.0000 4 195 3255 11775 12525 stream buffer (byte-level FIFO)\001
+4 2 0 49 -1 4 12 0.0000 4 195 2835 3675 10725 xprt->subscribe(SUB_RECV)\001
+4 2 0 49 -1 4 12 0.0000 4 195 2850 12225 10725 xprt->subscribe(SUB_SEND)\001
diff --git a/doc/internals/muxes.pdf b/doc/internals/muxes.pdf
new file mode 100644
index 0000000..d0c6432
--- /dev/null
+++ b/doc/internals/muxes.pdf
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