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.

2 files changed, 21 insertions, 7 deletions

diff --git a/erts/etc/common/erlexec.c b/erts/etc/common/erlexec.c
index 5ebde8ca3c..d33ea59c1d 100644
--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -807,6 +807,7 @@ int main(int argc, char **argv)
 		  case 'a':
 		  case 'A':
 		  case 'b':
+		  case 'C':
 		  case 'e':
 		  case 'i':
 		  case 'n':
@@ -880,6 +881,19 @@ int main(int argc, char **argv)
 		      }
 		      add_Eargs(argv[i]);
 		      break;
+		  case 'c':
+		      argv[i][0] = '-';
+		      if (argv[i][2] == '\0' && i+1 < argc) {
+			  if (sys_strcmp(argv[i+1], "true") == 0
+			      || sys_strcmp(argv[i+1], "false") == 0) {
+			      add_Eargs(argv[i]);
+			      add_Eargs(argv[i+1]);
+			      i++;
+			      break;
+			  }
+		      }
+		      add_Eargs(argv[i]);
+		      break;
 		  case 'M': {
 		      int x;
 		      for (x = 0; plusM_au_allocs[x]; x++)
@@ -1149,8 +1163,8 @@ usage_aux(void)
 #endif
 	  "] "
 	  "[-make] [-man [manopts] MANPAGE] [-x] [-emu_args] "
-	  "[-args_file FILENAME] [+A THREADS] [+a SIZE] [+B[c|d|i]] [+c] "
-	  "[+h HEAP_SIZE_OPTION] [+K BOOLEAN] "
+	  "[-args_file FILENAME] [+A THREADS] [+a SIZE] [+B[c|d|i]] [+c [BOOLEAN]] "
+	  "[+C MODE] [+h HEAP_SIZE_OPTION] [+K BOOLEAN] "
 	  "[+l] [+M<SUBSWITCH> <ARGUMENT>] [+P MAX_PROCS] [+Q MAX_PORTS] "
 	  "[+R COMPAT_REL] "
 	  "[+r] [+rg READER_GROUPS_LIMIT] [+s SCHEDULER_OPTION] "
diff --git a/erts/etc/common/heart.c b/erts/etc/common/heart.c
index 2830641802..a4f34e21d0 100644
--- a/erts/etc/common/heart.c
+++ b/erts/etc/common/heart.c
@@ -109,7 +109,7 @@
 #  include <sys/time.h>
 #  include <unistd.h>
 #  include <signal.h>
-#  if defined(CORRECT_USING_TIMES)
+#  if defined(OS_MONOTONIC_TIME_USING_TIMES)
 #    include <sys/times.h>
 #    include <limits.h>
 #  endif
@@ -1084,9 +1084,9 @@ time_t timestamp(time_t *res)
     return r;
 }
 
-#elif defined(HAVE_GETHRTIME)  || defined(GETHRTIME_WITH_CLOCK_GETTIME)
+#elif defined(OS_MONOTONIC_TIME_USING_GETHRTIME) || defined(OS_MONOTONIC_TIME_USING_CLOCK_GETTIME)
 
-#if defined(GETHRTIME_WITH_CLOCK_GETTIME)
+#if defined(OS_MONOTONIC_TIME_USING_CLOCK_GETTIME)
 typedef long long SysHrTime;
 
 SysHrTime sys_gethrtime(void);
@@ -1095,7 +1095,7 @@ SysHrTime sys_gethrtime(void)
 {
     struct timespec ts;
     long long result;
-    if (clock_gettime(CLOCK_MONOTONIC,&ts) != 0) {
+    if (clock_gettime(MONOTONIC_CLOCK_ID,&ts) != 0) {
 	print_error("Fatal, could not get clock_monotonic value, terminating! "
 		    "errno = %d\n", errno);
 	exit(1);
@@ -1122,7 +1122,7 @@ time_t timestamp(time_t *res)
     return r;
 }
 
-#elif defined(CORRECT_USING_TIMES)
+#elif defined(OS_MONOTONIC_TIME_USING_TIMES)
 
 #  ifdef NO_SYSCONF
 #    include <sys/param.h>