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authorSteve Vinoski <[email protected]>2013-08-27 11:42:00 -0400
committerLukas Larsson <[email protected]>2013-09-23 17:23:14 +0200
commit7fbf2c26ac063988818230a0e18a9df48c2fbf2d (patch)
tree8ee574a718eb61d7d99133e47a2a37bc1d94e115 /erts/preloaded
parentcc3c34fce28062afcaadc288b69939ced8fd8cde (diff)
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add {active,N} socket option for TCP, UDP, and SCTP
Add the {active,N} socket option, where N is an integer in the range -32768..32767, to allow a caller to specify the number of data messages to be delivered to the controlling process. Once the socket's delivered message count either reaches 0 or is explicitly set to 0 with inet:setopts/2 or by including {active,0} as an option when the socket is created, the socket transitions to passive ({active, false}) mode and the socket's controlling process receives a message to inform it of the transition. TCP sockets receive {tcp_passive,Socket}, UDP sockets receive {udp_passive,Socket} and SCTP sockets receive {sctp_passive,Socket}. The socket's delivered message counter defaults to 0, but it can be set using {active,N} via any gen_tcp, gen_udp, or gen_sctp function that takes socket options as arguments, or via inet:setopts/2. New N values are added to the socket's current counter value, and negative numbers can be used to reduce the counter value. Specifying a number that would cause the socket's counter value to go above 32767 causes an einval error. If a negative number is specified such that the counter value would become negative, the socket's counter value is set to 0 and the socket transitions to passive mode. If the counter value is already 0 and inet:setopts(Socket, [{active,0}]) is specified, the counter value remains at 0 but the appropriate passive mode transition message is generated for the socket. This commit contains a modified preloaded prim_inet.beam due to changes in prim_inet.erl. Add tests for {active,N} mode for TCP, UDP, and SCTP sockets. Add documentation for {active,N} mode for inet, gen_tcp, gen_udp, and gen_sctp.
Diffstat (limited to 'erts/preloaded')
-rw-r--r--erts/preloaded/src/prim_inet.erl20
1 files changed, 16 insertions, 4 deletions
diff --git a/erts/preloaded/src/prim_inet.erl b/erts/preloaded/src/prim_inet.erl
index fa621681f3..69eed716ff 100644
--- a/erts/preloaded/src/prim_inet.erl
+++ b/erts/preloaded/src/prim_inet.erl
@@ -1237,7 +1237,8 @@ type_opt_1(buffer) -> int;
type_opt_1(active) ->
{enum,[{false, ?INET_PASSIVE},
{true, ?INET_ACTIVE},
- {once, ?INET_ONCE}]};
+ {once, ?INET_ONCE},
+ {multi, ?INET_MULTI}]};
type_opt_1(packet) ->
{enum,[{0, ?TCP_PB_RAW},
{1, ?TCP_PB_1},
@@ -1716,11 +1717,14 @@ encode_opt_val(Opts) ->
Reason -> {error,Reason}
end.
+%% {active, once} and {active, N} are specially optimized because they will
+%% be used for every packet or every N packets, not only once when
+%% initializing the socket. Measurements show that this optimization is
+%% worthwhile.
enc_opt_val([{active,once}|Opts], Acc) ->
- %% Specially optimized because {active,once} will be used for
- %% every packet, not only once when initializing the socket.
- %% Measurements show that this optimization is worthwhile.
enc_opt_val(Opts, [<<?INET_LOPT_ACTIVE:8,?INET_ONCE:32>>|Acc]);
+enc_opt_val([{active,N}|Opts], Acc) when is_integer(N), N < 32768, N >= -32768 ->
+ enc_opt_val(Opts, [<<?INET_LOPT_ACTIVE:8,?INET_MULTI:32,N:16>>|Acc]);
enc_opt_val([{raw,P,O,B}|Opts], Acc) ->
enc_opt_val(Opts, Acc, raw, {P,O,B});
enc_opt_val([{Opt,Val}|Opts], Acc) ->
@@ -1810,6 +1814,14 @@ dec_opt_val([]) -> [].
dec_opt_val(Buf, raw, Type) ->
{{P,O,B},T} = dec_value(Type, Buf),
[{raw,P,O,B}|dec_opt_val(T)];
+dec_opt_val(Buf, active, Type) ->
+ case dec_value(Type, Buf) of
+ {multi,[M0,M1|T]} ->
+ <<N:16>> = list_to_binary([M0,M1]),
+ [{active,N}|dec_opt_val(T)];
+ {Val,T} ->
+ [{active,Val}|dec_opt_val(T)]
+ end;
dec_opt_val(Buf, Opt, Type) ->
{Val,T} = dec_value(Type, Buf),
[{Opt,Val}|dec_opt_val(T)].