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-rw-r--r--erts/emulator/beam/dist.h37
1 files changed, 31 insertions, 6 deletions
diff --git a/erts/emulator/beam/dist.h b/erts/emulator/beam/dist.h
index ea4697815f..202457bb3b 100644
--- a/erts/emulator/beam/dist.h
+++ b/erts/emulator/beam/dist.h
@@ -40,26 +40,51 @@
#define DFLAG_UNICODE_IO 0x1000
#define DFLAG_DIST_HDR_ATOM_CACHE 0x2000
#define DFLAG_SMALL_ATOM_TAGS 0x4000
-#define DFLAG_INTERNAL_TAGS 0x8000
+#define DFLAG_INTERNAL_TAGS 0x8000 /* used by ETS 'compressed' option */
#define DFLAG_UTF8_ATOMS 0x10000
#define DFLAG_MAP_TAG 0x20000
#define DFLAG_BIG_CREATION 0x40000
#define DFLAG_SEND_SENDER 0x80000
-#define DFLAG_NO_MAGIC 0x100000
+#define DFLAG_NO_MAGIC 0x100000 /* internal for pending connection */
-/* Mandatory flags for distribution (sync with dist_util.erl) */
+/* Mandatory flags for distribution */
#define DFLAG_DIST_MANDATORY (DFLAG_EXTENDED_REFERENCES \
| DFLAG_EXTENDED_PIDS_PORTS \
| DFLAG_UTF8_ATOMS \
| DFLAG_NEW_FUN_TAGS)
-/* Additional optimistic flags when encoding toward pending connection */
-#define DFLAG_DIST_HOPEFULLY (DFLAG_NO_MAGIC \
- | DFLAG_EXPORT_PTR_TAG \
+/*
+ * Additional optimistic flags when encoding toward pending connection.
+ * If remote node does not supporting these (erl_interface)
+ * then we will need to transcode all messages enqueued before
+ * connection setup was finished.
+ */
+#define DFLAG_DIST_HOPEFULLY (DFLAG_EXPORT_PTR_TAG \
| DFLAG_BIT_BINARIES \
| DFLAG_DIST_MONITOR \
| DFLAG_DIST_MONITOR_NAME)
+/* Our preferred set of flags. Used for connection setup handshake */
+#define DFLAG_DIST_DEFAULT (DFLAG_DIST_MANDATORY | DFLAG_DIST_HOPEFULLY \
+ | DFLAG_FUN_TAGS \
+ | DFLAG_NEW_FLOATS \
+ | DFLAG_UNICODE_IO \
+ | DFLAG_DIST_HDR_ATOM_CACHE \
+ | DFLAG_SMALL_ATOM_TAGS \
+ | DFLAG_UTF8_ATOMS \
+ | DFLAG_MAP_TAG \
+ | DFLAG_BIG_CREATION \
+ | DFLAG_SEND_SENDER)
+
+/* Flags addable by local distr implementations */
+#define DFLAG_DIST_ADDABLE DFLAG_DIST_DEFAULT
+
+/* Flags rejectable by local distr implementation */
+#define DFLAG_DIST_REJECTABLE (DFLAG_DIST_HDR_ATOM_CACHE \
+ | DFLAG_HIDDEN_ATOM_CACHE \
+ | DFLAG_ATOM_CACHE)
+
+
/* All flags that should be enabled when term_to_binary/1 is used. */
#define TERM_TO_BINARY_DFLAGS (DFLAG_EXTENDED_REFERENCES \
| DFLAG_NEW_FUN_TAGS \