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, 40 insertions, 0 deletions

diff --git a/erts/emulator/beam/big.c b/erts/emulator/beam/big.c
index de7d370938..30e6a2c522 100644
--- a/erts/emulator/beam/big.c
+++ b/erts/emulator/beam/big.c
@@ -1577,6 +1577,46 @@ Eterm erts_sint64_to_big(Sint64 x, Eterm **hpp)
     return make_big(hp);
 }
 
+Eterm
+erts_uint64_array_to_big(Uint **hpp, int neg, int len, Uint64 *array)
+{
+    Uint *headerp;
+    int i, pot_digits, digits;
+
+    headerp = *hpp;
+
+    pot_digits = digits = 0;
+    for (i = 0; i < len; i++) {
+#if defined(ARCH_32) || HALFWORD_HEAP
+	Uint low_val = array[i] & ((Uint) 0xffffffff);
+	Uint high_val = (array[i] >> 32) & ((Uint) 0xffffffff);
+	BIG_DIGIT(headerp, pot_digits) = low_val;
+	pot_digits++;
+	if (low_val)
+	    digits = pot_digits;
+	BIG_DIGIT(headerp, pot_digits) = high_val;
+	pot_digits++;
+	if (high_val)
+	    digits = pot_digits;
+#else
+	Uint val = array[i];
+	BIG_DIGIT(headerp, pot_digits) = val;
+	pot_digits++;
+	if (val)
+	    digits = pot_digits;
+#endif
+    }	
+
+    if (neg)
+	*headerp = make_neg_bignum_header(digits);
+    else
+	*headerp = make_pos_bignum_header(digits);
+
+    *hpp = headerp + 1 + digits;
+
+    return make_big(headerp);
+}
+
 /*
 ** Convert a bignum to a double float
 */