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Performance for processes that receive huge amounts of
messages can be increased by storing the incoming messages
outside the heap (that avoids copying the message in a
garbage collection).
Two OTP processes that are known to receive many messages
are 'rex' (used by 'rpc') and 'error_logger'.
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This decreases the load on the rex server.
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* henrik/update-copyrightyear:
update copyright-year
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rpc:pinfo/2 is documented as a location-transparent version
of process_info/2. Therefore, it should be expected that
the spec would allow calls with an item list, for example:
rpc:pinfo(Pid, [initial_call,last_calls])
Report-URL: http://bugs.erlang.org/browse/ERL-124
Reported-by: bjfish
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The documentation for rpc:call() says:
Evaluates apply(Module, Function, Args) on the node Node and
returns the corresponding value Res, or {badrpc, Reason} if
the call fails.
What is not said that rpc:call() can generate an exception if the
'rex' process on the other node is killed:
(kalle@host)1> Rex = rpc:call(arne@host, erlang, whereis, [rex]).
<6937.14.0>
(kalle@host)2> rpc:call(arne@host, erlang, exit, [Rex,kill]).
** exception exit: {killed,
{gen_server,call,
[{rex,arne@host},
{call,erlang,exit,[<6937.14.0>,kill],<0.33.0>},
infinity]}}
in function rpc:rpc_check/1 (rpc.erl, line 361)
On the other hand, if the other node shuts down for some other reason,
we'll get a {badrpc,nodedown} result:
(kalle@host)5> rpc:call(arne@host, erlang, halt, []).
{badrpc,nodedown}
There does not seem to be any reason to handle the two cases
differently. If the 'rex' process is terminated on the other node,
it will shut down shortly thereafter.
Therefore, change rpc:call() and rpc:block_call() to always return
{badrpc,Reason} is the call fails:
(kalle@host)1> Rex = rpc:call(arne@host, erlang, whereis, [rex]).
<6937.14.0>
(kalle@host)2> rpc:call(arne@host, erlang, exit, [Rex,kill]).
{badrpc,{'EXIT',{killed,{gen_server,call,
[{rex,arne@host},
{call,erlang,exit,[<7126.14.0>,kill],<0.33.0>},
infinity]}}}}
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The types array(), dict(), digraph(), gb_set(), gb_tree(), queue(),
set(), and tid() have been deprecated. They will be removed in OTP 18.0.
Instead the types array:array(), dict:dict(), digraph:graph(),
gb_set:set(), gb_tree:tree(), queue:queue(), sets:set(), and ets:tid()
can be used. (Note: it has always been necessary to use ets:tid().)
It is allowed in OTP 17.0 to locally re-define the types array(), dict(),
and so on.
New types array:array/1, dict:dict/2, gb_sets:set/1, gb_trees:tree/2,
queue:queue/1, and sets:set/1 have been added.
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Opaque types need to be exported.
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-module(rpc_example).
-export([f/0, should_return_ok/0]).
should_return_ok() ->
{badrpc, timeout} = rpc:call(node(), ?MODULE, f, [], 5000),
ok.
f() ->
Ref = make_ref(),
receive
Ref -> ok
end.
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An incorrect spec, rpc:yield/1, has been fixed.
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* ks/types:
file.hrl: Move out type declarations
kernel: Add types and specs
OTP-8494 ks/types
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