erts: Keep track of which NIF a scheduler is executing

This may be of interest in crash dumps and allows the upcoming
allocation tagging feature to track allocations on a per-NIF basis.

Note that this is only updated when user code calls a NIF; it's not
altered when the emulator calls NIFs during code upgrades or
tracing.

1 files changed, 1 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h
index e232776016..bb97b6690c 100644
--- a/erts/emulator/beam/erl_process.h
+++ b/erts/emulator/beam/erl_process.h
@@ -637,6 +637,7 @@ struct ErtsSchedulerData_ {
     ErtsSchedType type;
     Uint no;			/* Scheduler number for normal schedulers */
     Uint dirty_no;  /* Scheduler number for dirty schedulers */
+    struct enif_environment_t *current_nif;
     Process *dirty_shadow_process;
     Port *current_port;
     ErtsRunQueue *run_queue;