Break apart erlang:load_module/2 into two separate BIFs

Introduce two new BIFs, erlang:prepare_loading/2 and
erlang:finish_loading/1, and re-implement erlang:load_module/2 in
Erlang code.

We have two reasons for doing this:

* To facilitate suspending a process if another process
  is already doing code loading.

* In the future, we can implement parallel and atomic loading
  of several modules. Atomic loading works except for modules with
  on_load handlers. Because of that issue, erlang:finish_loading/2
  will currently only accept a list with a single magic binary.

1 files changed, 1 insertions, 0 deletions

diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index 6bafff0d6e..53a73fd762 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -873,6 +873,7 @@ typedef struct {
 } FunctionInfo;
 
 Binary* erts_alloc_loader_state(void);
+int erts_module_for_prepared_code(Binary* magic);
 Eterm erts_prepare_loading(Binary* loader_state,  Process *c_p,
 			   Eterm group_leader, Eterm* modp,
 			   byte* code, Uint size);