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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
%% 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.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2009 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2009 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2009 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_memsup_darwin).
-export([init/0, update/1, get_memory_data/1]).
-record(state, {total_memory,
allocated_memory}).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(state() :: #state { total_memory :: ('undefined' | non_neg_integer()),
allocated_memory :: ('undefined' | non_neg_integer())
}).
-spec(init/0 :: () -> state()).
-spec(update/1 :: (state()) -> state()).
-spec(get_memory_data/1 :: (state()) -> {non_neg_integer(), non_neg_integer(),
('undefined' | pid())}).
-endif.
%%----------------------------------------------------------------------------
init() ->
#state{total_memory = undefined,
allocated_memory = undefined}.
update(State) ->
File = os:cmd("/usr/bin/vm_stat"),
Lines = string:tokens(File, "\n"),
Dict = dict:from_list(lists:map(fun parse_line/1, Lines)),
[PageSize, Inactive, Active, Free, Wired] =
[dict:fetch(Key, Dict) ||
Key <- [page_size, 'Pages inactive', 'Pages active', 'Pages free',
'Pages wired down']],
MemTotal = PageSize * (Inactive + Active + Free + Wired),
MemUsed = PageSize * (Active + Wired),
State#state{total_memory = MemTotal, allocated_memory = MemUsed}.
get_memory_data(State) ->
{State#state.total_memory, State#state.allocated_memory, undefined}.
%%----------------------------------------------------------------------------
%% A line looks like "Foo bar: 123456."
parse_line(Line) ->
[Name, RHS | _Rest] = string:tokens(Line, ":"),
case Name of
"Mach Virtual Memory Statistics" ->
["(page", "size", "of", PageSize, "bytes)"] =
string:tokens(RHS, " "),
{page_size, list_to_integer(PageSize)};
_ ->
[Value | _Rest1] = string:tokens(RHS, " ."),
{list_to_atom(Name), list_to_integer(Value)}
end.
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