Merge branch 'dev' of super:otp into dev

* 'dev' of super:otp: (166 commits)
  Corrected documentation error and added examples to Users Guide
  In TLS 1.1, failure to properly close a connection no longer requires that a session not be resumed.  This is a change from TLS 1.0 to conform with widespread implementation practice.  Erlang ssl will now in TLS 1.0 conform to the widespread implementation practice instead of the specification to avoid performance issues.
  Add escript to bootstrap/bin
  Remove unused variable warning in inet_res
  Remove unused variable in epmd_port
  Remove compiler warnings in inet_drv
  Add SASL test suite
  Allow same module name in multiple applications if explicitely excluded
  Fix bugs concerning the option report_missing_types
  Fix default encoding in SAX parser.
  re: remove gratuitous "it " in manpage
  Spelling in (backward *compatibility*) comment.
  Improve erl_docgen's support for Dialyzer specs and types
  dialyzer warning on mnesia_tm
  Add documentation text about majority checking
  add mnesia_majority_test suite
  where_to_wlock optimization + change_table_majority/2
  bug in mnesia_tm:needs_majority/2
  optimize sticky_lock maj. check
  check majority for sticky locks
  ...

1 files changed, 175 insertions, 0 deletions

diff --git a/lib/sasl/test/overload_SUITE.erl b/lib/sasl/test/overload_SUITE.erl
new file mode 100644
index 0000000000..92b1aaed6e
--- /dev/null
+++ b/lib/sasl/test/overload_SUITE.erl
@@ -0,0 +1,175 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2011. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(overload_SUITE).
+-include("test_server.hrl").
+
+-compile(export_all).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+all() -> [info, set_config_data, set_env_vars, request, timeout].
+all(suite) -> all().
+
+init_per_testcase(_Case,Config) ->
+    restart_sasl(),
+    Config.
+
+end_per_testcase(Case,Config) ->
+    try apply(?MODULE,Case,[cleanup,Config])
+    catch error:undef -> ok
+    end,
+    ok.
+
+%%%-----------------------------------------------------------------
+info(suite) -> [];
+info(_Config) ->
+    ?line Info = overload:get_overload_info(),
+    ?line [{total_intensity,0.0},
+	   {accept_intensity,0.0},
+	   {max_intensity,0.8},
+	   {weight,0.1},
+	   {total_requests,0},
+	   {accepted_requests,0}] = Info.
+
+%%%-----------------------------------------------------------------
+set_config_data(suite) -> [];
+set_config_data(_Config) ->
+    ?line InfoDefault = overload:get_overload_info(),
+    ?line ok = check_info(0.8,0.1,InfoDefault),
+    ?line ok = overload:set_config_data(0.5,0.4),
+    ?line Info1 = overload:get_overload_info(),
+    ?line ok = check_info(0.5,0.4,Info1),
+    ok.
+
+%%%-----------------------------------------------------------------
+set_env_vars(suite) -> [];
+set_env_vars(_Config) ->
+    ?line InfoDefault = overload:get_overload_info(),
+    ?line ok = check_info(0.8,0.1,InfoDefault),
+    ?line ok = application:set_env(sasl,overload_max_intensity,0.5),
+    ?line ok = application:set_env(sasl,overload_weight,0.4),
+    ?line ok = application:stop(sasl),
+    ?line ok = application:start(sasl),
+    ?line Info1 = overload:get_overload_info(),
+    ?line ok = check_info(0.5,0.4,Info1),
+    ok.
+set_env_vars(cleanup,_Config) ->
+    application:unset_env(sasl,overload_max_intensity),
+    application:unset_env(sasl,overload_weight),
+    ok.
+
+%%%-----------------------------------------------------------------
+request(suite) -> [];
+request(_Config) ->
+    %% Find number of request that can be done with default settings
+    %% and no delay
+    ?line overload:set_config_data(0.8, 0.1),
+    ?line NDefault = do_many_requests(0),
+    ?line restart_sasl(),
+    ?line ?t:format("NDefault: ~p",[NDefault]),
+ 
+    %% Check that the number of requests increases when max_intensity
+    %% increases
+    ?line overload:set_config_data(2, 0.1),
+    ?line NLargeMI = do_many_requests(0),
+    ?line restart_sasl(),
+    ?line ?t:format("NLargeMI: ~p",[NLargeMI]),
+    ?line true = NLargeMI > NDefault,
+
+    %% Check that the number of requests decreases when weight
+    %% increases
+    ?line overload:set_config_data(0.8, 1),
+    ?line NLargeWeight = do_many_requests(0),
+    ?line restart_sasl(),
+    ?line ?t:format("NLargeWeight: ~p",[NLargeWeight]),
+    ?line true = NLargeWeight < NDefault,
+
+    %% Check that number of requests increases when delay between
+    %% requests increases.
+    %% (Keeping same config and comparing to large weight in order to
+    %% minimize the time needed for this case.)
+    ?line overload:set_config_data(0.8, 1),
+    ?line NLargeTime = do_many_requests(500),
+    ?line restart_sasl(),
+    ?line ?t:format("NLargeTime: ~p",[NLargeTime]),
+    ?line true = NLargeTime > NLargeWeight,
+    ok.
+
+%%%-----------------------------------------------------------------
+timeout(suite) -> [];
+timeout(_Config) ->
+    ?line overload:set_config_data(0.8, 1),
+    ?line _N = do_many_requests(0),
+    
+    %% Check that the overload alarm is raised
+    ?line [{overload,_}] = alarm_handler:get_alarms(),
+
+    %% Fake a clear timeout in overload.erl and check that, since it
+    %% came very soon after the overload situation, the alarm is not
+    %% cleared
+    ?line overload ! timeout,
+    ?line timer:sleep(1000),
+    ?line [{overload,_}] = alarm_handler:get_alarms(),
+
+    %% A bit later, try again and check that this time the alarm is
+    %% cleared
+    ?line overload ! timeout,
+    ?line timer:sleep(1000),
+    ?line [] = alarm_handler:get_alarms(),
+
+    ok.
+
+
+%%%-----------------------------------------------------------------
+%%% INTERNAL FUNCTIONS
+
+%%%-----------------------------------------------------------------
+%%% Call overload:request/0 up to 30 times with the given time delay
+%%% between. Stop when 'reject' is returned.
+do_many_requests(T) ->
+    30 - do_requests(30,T).
+
+do_requests(0,_) ->
+    ?t:fail(never_rejected);
+do_requests(N,T) ->
+    case overload:request() of
+	accept ->
+	    timer:sleep(T),
+	    do_requests(N-1,T);
+	reject ->
+	    N
+    end.
+
+%%%-----------------------------------------------------------------
+%%% Restart the sasl application
+restart_sasl() ->
+    application:stop(sasl),
+    application:start(sasl),
+    ok.
+
+%%%-----------------------------------------------------------------
+%%% Check that max_intensity and weight is set as expected
+check_info(MI,W,Info) -> 
+    case {lists:keyfind(max_intensity,1,Info), lists:keyfind(weight,1,Info)} of
+	{{_,MI},{_,W}} -> ok;
+	_ -> ?t:fail({unexpected_info,MI,W,Info})
+    end.
+    
+