Merge branch 'sverker/enif_select/OTP-13684'

* sverker/enif_select: (31 commits)
  Remove debug printout and comment
  Fix nif_SUITE:select for old linux
  Add docs for enif_compare_monitors and ErlNifMonitor
  Fix ErlNifMonitor handling
  Remove faulty debug ASSERT
  erts: Skip nif_SUITE:select on windows
  Fix enif_select for windows
  Fix whitebox monitor tests
  Fix erl_nif doc
  Expand nif_SUITE:monitor_frenzy to verify dtor calls
  Expand nif_SUITE:monitor_frenzy with binary_to_term
  erts: Avoid revival of dying resource by dec_term
  erts: Add enif_compare_monitors
  erts: Try fix enif_select for windows
  erts: Change return value for enif_select
  erts: Add pid argument to enif_select
  erts: Beautify enif_select
  erts: Fix bad_fd_in_pollset error case for enif_select
  erts: Add enif_monitor_process and enif_demonitor_process
  erts: Rename ErlNifResource as ErtsResource
  ...

1 files changed, 3 insertions, 5 deletions

diff --git a/erts/emulator/beam/erl_binary.h b/erts/emulator/beam/erl_binary.h
index db259be2a7..946d3cfe03 100644
--- a/erts/emulator/beam/erl_binary.h
+++ b/erts/emulator/beam/erl_binary.h
@@ -79,11 +79,9 @@ struct magic_binary {
     } u;
 };
 
-#ifdef ARCH_32
-#define ERTS_MAGIC_BIN_BYTES_TO_ALIGN 4
-#else
-#define ERTS_MAGIC_BIN_BYTES_TO_ALIGN 0
-#endif
+#define ERTS_MAGIC_BIN_BYTES_TO_ALIGN \
+    (offsetof(ErtsMagicBinary,u.aligned.data) - \
+     offsetof(ErtsMagicBinary,u.unaligned.data))
 
 typedef union {
     Binary binary;