A Guide To The Erlang Source
A guide to the erlang source.
Most of the interesting code is in: erts/emulator/beam
The atoms used in erlang are listed in erts/emulator/beam/atom.names and are referenced in the code as am_foo. So the 'EXIT' atom is am_EXIT in the code.
Most used types are: Sint, Uint, Eterm, ... Conversion is done in erts/emulator/beam/big.c. For example uint_to_big(Uint x, Eterm *y). term_to_Uint(Eterm term, Uint *up)
The process struct is defined in erts/emulator/beam/process.h. The important function is Process *schedule(Process *p, int calls) in process.c . The next process is picked in "pick_next_process" of that method.
Process statuses are:
- define P_FREE 0
- define P_RUNABLE 1
- define P_WAITING 2
- define P_RUNNING 3
- define P_EXITING 4
- define P_GARBING 5
- define P_SUSPENDED 6
See erl_monitor.c and .h. The main structs are ErtsLinks and ErtsMonitor. Each process has a *ErtLinks and *ErtsMonitor (herein all its links/monitors are kept as an AVL tree). Actions are done with erts_sweep_links(ErtsLink *root, ...) and erts_sweep_monitors(ErtsMonitor *root, ...).