Merge branch 'rickard/time_api/OTP-11997'

* rickard/time_api/OTP-11997: (22 commits)
  Update primary bootstrap
  inets: Suppress deprecated warning on erlang:now/0
  inets: Cleanup of multiple copies of functions Add inets_lib with common functions used by multiple modules
  inets: Update comments
  Suppress deprecated warning on erlang:now/0
  Use new time API and be back-compatible in inets Remove unused functions and removed redundant test
  asn1 test SUITE: Eliminate use of now/0
  Disable deprecated warning on erlang:now/0 in diameter_lib
  Use new time API and be back-compatible in ssh
  Replace all calls to now/0 in CT with new time API functions
  test_server: Replace usage of erlang:now() with usage of new API
  Replace usage of erlang:now() with usage of new API
  Replace usage of erlang:now() with usage of new API
  Replace usage of erlang:now() with usage of new API
  Replace usage of erlang:now() with usage of new API
  otp_SUITE: Warn for calls to erlang:now/0
  Replace usage of erlang:now() with usage of new API
  Multiple timer wheels
  Erlang based BIF timer implementation for scalability
  Implement ethread events with timeout
  ...

Conflicts:
	bootstrap/bin/start.boot
	bootstrap/bin/start_clean.boot
	bootstrap/lib/compiler/ebin/beam_asm.beam
	bootstrap/lib/compiler/ebin/compile.beam
	bootstrap/lib/kernel/ebin/auth.beam
	bootstrap/lib/kernel/ebin/dist_util.beam
	bootstrap/lib/kernel/ebin/global.beam
	bootstrap/lib/kernel/ebin/hipe_unified_loader.beam
	bootstrap/lib/kernel/ebin/inet_db.beam
	bootstrap/lib/kernel/ebin/inet_dns.beam
	bootstrap/lib/kernel/ebin/inet_res.beam
	bootstrap/lib/kernel/ebin/os.beam
	bootstrap/lib/kernel/ebin/pg2.beam
	bootstrap/lib/stdlib/ebin/dets.beam
	bootstrap/lib/stdlib/ebin/dets_utils.beam
	bootstrap/lib/stdlib/ebin/erl_tar.beam
	bootstrap/lib/stdlib/ebin/escript.beam
	bootstrap/lib/stdlib/ebin/file_sorter.beam
	bootstrap/lib/stdlib/ebin/otp_internal.beam
	bootstrap/lib/stdlib/ebin/qlc.beam
	bootstrap/lib/stdlib/ebin/random.beam
	bootstrap/lib/stdlib/ebin/supervisor.beam
	bootstrap/lib/stdlib/ebin/timer.beam
	erts/aclocal.m4
	erts/emulator/beam/bif.c
	erts/emulator/beam/erl_bif_info.c
	erts/emulator/beam/erl_db_hash.c
	erts/emulator/beam/erl_init.c
	erts/emulator/beam/erl_process.h
	erts/emulator/beam/erl_thr_progress.c
	erts/emulator/beam/utils.c
	erts/emulator/sys/unix/sys.c
	erts/preloaded/ebin/erlang.beam
	erts/preloaded/ebin/erts_internal.beam
	erts/preloaded/ebin/init.beam
	erts/preloaded/src/erts_internal.erl
	lib/common_test/test/ct_hooks_SUITE_data/cth/tests/empty_cth.erl
	lib/diameter/src/base/diameter_lib.erl
	lib/kernel/src/os.erl
	lib/ssh/test/ssh_basic_SUITE.erl
	system/doc/efficiency_guide/advanced.xml

1 files changed, 43 insertions, 5 deletions

diff --git a/lib/kernel/doc/src/os.xml b/lib/kernel/doc/src/os.xml
index 8b85f24455..b9dbede0d3 100644
--- a/lib/kernel/doc/src/os.xml
+++ b/lib/kernel/doc/src/os.xml
@@ -142,14 +142,49 @@ DirOut = os:cmd("dir"), % on Win32 platform</code>
       </desc>
     </func>
     <func>
+      <name name="system_time" arity="0"/>
+      <fsummary>Current OS system time</fsummary>
+      <desc>
+	<p>Returns current
+	<seealso marker="erts:time_correction#OS_System_Time">OS system time</seealso>
+	in <c>native</c>
+	<seealso marker="erts:erlang#type_time_unit">time unit</seealso>.</p>
+
+	<note><p>This time is <em>not</em> a monotonically increasing time.</p></note>
+      </desc>
+    </func>
+    <func>
+      <name name="system_time" arity="1"/>
+      <fsummary>Current OS system time</fsummary>
+      <desc>
+	<p>Returns current
+	<seealso marker="erts:time_correction#OS_System_Time">OS system time</seealso>
+	converted into the <c><anno>Unit</anno></c> passed as argument.</p>
+
+	<p>Calling <c>os:system_time(<anno>Unit</anno>)</c> is equivalent to: 
+	<seealso marker="erts:erlang#convert_time_unit/3"><c>erlang:convert_time_unit</c></seealso><c>(</c><seealso marker="#system_time/0"><c>os:system_time()</c></seealso><c>,
+	native, <anno>Unit</anno>)</c>.</p>
+
+	<note><p>This time is <em>not</em> a monotonically increasing time.</p></note>
+      </desc>
+    </func>
+    <func>
       <name name="timestamp" arity="0"/>
       <type_desc variable="Timestamp">Timestamp = {MegaSecs, Secs, MicroSecs}</type_desc>
-      <fsummary>Returna a timestamp from the OS in the erlang:now/0 format</fsummary>
+      <fsummary>Current OS system time on the erlang:timestamp/0 format</fsummary>
       <desc>
-      <p>Returns a tuple in the same format as <seealso marker="erts:erlang#now/0">erlang:now/0</seealso>. The difference is that this function returns what the operating system thinks (a.k.a. the wall clock time) without any attempts at time correction. The result of two different calls to this function is <em>not</em> guaranteed to be different.</p>
-      <p>The most obvious use for this function is logging. The tuple can be used together with the function <seealso marker="stdlib:calendar#now_to_universal_time/1">calendar:now_to_universal_time/1</seealso> 
-or <seealso marker="stdlib:calendar#now_to_local_time/1">calendar:now_to_local_time/1</seealso> to get calendar time. Using the calendar time together with the <c>MicroSecs</c> part of the return tuple from this function allows you to log timestamps in high resolution and consistent with the time in the rest of the operating system.</p>
-      <p>Example of code formatting a string in the format &quot;DD Mon YYYY HH:MM:SS.mmmmmm&quot;, where DD is the day of month, Mon is the textual month name, YYYY is the year, HH:MM:SS is the time and mmmmmm is the microseconds in six positions:</p>
+      <p>Returns current
+	<seealso marker="erts:time_correction#OS_System_Time">OS system time</seealso>
+        in the same format as <seealso marker="erts:erlang#timestamp/0">erlang:timestamp/0</seealso>.
+	The tuple can be used together with the function
+	<seealso marker="stdlib:calendar#now_to_universal_time/1">calendar:now_to_universal_time/1</seealso> 
+        or <seealso marker="stdlib:calendar#now_to_local_time/1">calendar:now_to_local_time/1</seealso> to
+        get calendar time. Using the calendar time together with the <c>MicroSecs</c> part of the return
+        tuple from this function allows you to log timestamps in high resolution and consistent with the
+        time in the rest of the operating system.</p>
+      <p>Example of code formatting a string in the format &quot;DD Mon YYYY HH:MM:SS.mmmmmm&quot;, where
+         DD is the day of month, Mon is the textual month name, YYYY is the year, HH:MM:SS is the time and
+         mmmmmm is the microseconds in six positions:</p>
 <code>
 -module(print_time).
 -export([format_utc_timestamp/0]).
@@ -168,6 +203,9 @@ format_utc_timestamp() ->
 1> <input>io:format("~s~n",[print_time:format_utc_timestamp()]).</input>
 29 Apr 2009  9:55:30.051711
 </pre>
+       <p>OS system time can also be retreived by
+	<c><seealso marker="#system_time/0"><c>os:system_time/0</c></seealso></c>,
+	and <seealso marker="#system_time/1"><c>os:system_time/1</c></seealso>.</p>
       </desc>
     </func>
     <func>