Introduce a new time API

The old time API is based on erlang:now/0. The major issue with
erlang:now/0 is that it was intended to be used for so many
unrelated things. This tied these unrelated operations together
and unnecessarily caused performance, scalability as well as
accuracy, and precision issues for operations that do not need
to have such issues. The new API spreads different functionality
over multiple functions in order to improve on this.

The new API consists of a number of new BIFs:
- erlang:convert_time_unit/3
- erlang:monotonic_time/0
- erlang:monotonic_time/1
- erlang:system_time/0
- erlang:system_time/1
- erlang:time_offset/0
- erlang:time_offset/1
- erlang:timestamp/0
- erlang:unique_integer/0
- erlang:unique_integer/1
- os:system_time/0
- os:system_time/1

and a number of extensions of existing BIFs:
- erlang:monitor(time_offset, clock_service)
- erlang:system_flag(time_offset, finalize)
- erlang:system_info(os_monotonic_time_source)
- erlang:system_info(time_offset)
- erlang:system_info(time_warp_mode)
- erlang:system_info(time_correction)
- erlang:system_info(start_time)

See the "Time and Time Correction in Erlang" chapter of the
ERTS User's Guide for more information.

1 files changed, 7 insertions, 0 deletions

diff --git a/erts/emulator/beam/big.h b/erts/emulator/beam/big.h
index da31876d75..4e4611de16 100644
--- a/erts/emulator/beam/big.h
+++ b/erts/emulator/beam/big.h
@@ -104,6 +104,9 @@ typedef Uint  dsize_t;	 /* Vector size type */
    : ERTS_UINT64_BIG_HEAP_SIZE__((X) >= 0 ? (X) : -(Uint64)(X)))
 #define ERTS_UINT64_HEAP_SIZE(X)				\
   (IS_USMALL(0, (X)) ? 0 : ERTS_UINT64_BIG_HEAP_SIZE__((X)))
+#define ERTS_MAX_SINT64_HEAP_SIZE (1 + 2)
+#define ERTS_MAX_UINT64_HEAP_SIZE (1 + 2)
+#define ERTS_UINT64_ARRAY_TO_BIG_MAX_HEAP_SZ(LEN) (2*(LEN)+1)
 
 #else
 
@@ -111,6 +114,9 @@ typedef Uint  dsize_t;	 /* Vector size type */
   (IS_SSMALL((X)) ? 0 : (1 + 1))
 #define ERTS_UINT64_HEAP_SIZE(X)				\
   (IS_USMALL(0, (X)) ? 0 : (1 + 1))
+#define ERTS_MAX_SINT64_HEAP_SIZE (1 + 1)
+#define ERTS_MAX_UINT64_HEAP_SIZE (1 + 1)
+#define ERTS_UINT64_ARRAY_TO_BIG_MAX_HEAP_SZ(LEN) ((LEN)+1)
 
 #endif
 
@@ -156,6 +162,7 @@ int term_to_Uint(Eterm, Uint*);
 int term_to_UWord(Eterm, UWord*);
 int term_to_Sint(Eterm, Sint*);
 #if HAVE_INT64
+Eterm erts_uint64_array_to_big(Uint **, int, int, Uint64 *);
 int term_to_Uint64(Eterm, Uint64*);
 int term_to_Sint64(Eterm, Sint64*);
 #endif