Deprecated ranch:start_listener/6 and child_spec/6

The NumAcceptors argument has been moved to transport option
num_acceptor, which defaults to 10. The functions now take
one less argument. The old functions are still here, though
deprecated.

12 files changed, 107 insertions, 63 deletions

diff --git a/doc/src/guide/embedded.asciidoc b/doc/src/guide/embedded.asciidoc
index 593a807..55c018b 100644
--- a/doc/src/guide/embedded.asciidoc
+++ b/doc/src/guide/embedded.asciidoc
@@ -17,7 +17,7 @@ regardless of the number of listeners you will use. Then you need to
 add the child specs for each listener.
 
 Ranch has a convenience function for getting the listeners child specs
-called `ranch:child_spec/6`, that works like `ranch:start_listener/6`,
+called `ranch:child_spec/5`, that works like `ranch:start_listener/5`,
 except that it doesn't start anything, it only returns child specs.
 
 As for `ranch_sup`, the child spec is simple enough to not require a
diff --git a/doc/src/guide/internals.asciidoc b/doc/src/guide/internals.asciidoc
index fa63f1d..c5bde58 100644
--- a/doc/src/guide/internals.asciidoc
+++ b/doc/src/guide/internals.asciidoc
@@ -47,7 +47,7 @@ that new process.
 
 === Number of acceptors
 
-The second argument to `ranch:start_listener/6` is the number of
+The second argument to `ranch:start_listener/5` is the number of
 processes that will be accepting connections. Care should be taken
 when choosing this number.
 
diff --git a/doc/src/guide/listeners.asciidoc b/doc/src/guide/listeners.asciidoc
index 1055b80..97afa22 100644
--- a/doc/src/guide/listeners.asciidoc
+++ b/doc/src/guide/listeners.asciidoc
@@ -26,7 +26,7 @@ When starting a listener, a number of different settings are required:
 Ranch includes both TCP and SSL transport handlers, respectively
 `ranch_tcp` and `ranch_ssl`.
 
-A listener can be started by calling the `ranch:start_listener/6`
+A listener can be started by calling the `ranch:start_listener/5`
 function. Before doing so however, you must ensure that the `ranch`
 application is started.
 
@@ -42,7 +42,7 @@ to the `echo_protocol` handler.
 .Starting a listener for TCP connections on port 5555
 
 [source,erlang]
-{ok, _} = ranch:start_listener(tcp_echo, 100,
+{ok, _} = ranch:start_listener(tcp_echo,
 	ranch_tcp, [{port, 5555}],
 	echo_protocol, []
 ).
@@ -108,12 +108,12 @@ the port number 0, or if you omit the port number entirely, Ranch will
 start listening on a random port.
 
 You can retrieve this port number by calling `ranch:get_port/1`. The
-argument is the name of the listener you gave in `ranch:start_listener/6`.
+argument is the name of the listener you gave in `ranch:start_listener/5`.
 
 .Starting a listener for TCP connections on a random port
 
 [source,erlang]
-{ok, _} = ranch:start_listener(tcp_echo, 100,
+{ok, _} = ranch:start_listener(tcp_echo,
 	ranch_tcp, [{port, 0}],
 	echo_protocol, []
 ).
@@ -159,7 +159,7 @@ connections are handled optimally.
 .Customizing the maximum number of concurrent connections
 
 [source,erlang]
-{ok, _} = ranch:start_listener(tcp_echo, 100,
+{ok, _} = ranch:start_listener(tcp_echo,
 	ranch_tcp, [{port, 5555}, {max_connections, 100}],
 	echo_protocol, []
 ).
@@ -169,7 +169,7 @@ You can disable this limit by setting its value to the atom `infinity`.
 .Disabling the limit for the number of connections
 
 [source,erlang]
-{ok, _} = ranch:start_listener(tcp_echo, 100,
+{ok, _} = ranch:start_listener(tcp_echo,
 	ranch_tcp, [{port, 5555}, {max_connections, infinity}],
 	echo_protocol, []
 ).
@@ -213,6 +213,24 @@ ranch:set_max_connections(tcp_echo, MaxConns).
 
 The change will occur immediately.
 
+=== Customizing the number of acceptor processes
+
+By default Ranch will use 10 acceptor processes. Their role is
+to accept connections and spawn a connection process for every
+new connection.
+
+This number can be tweaked to improve performance. A good
+number is typically between 10 or 100 acceptors. You must
+measure to find the best value for your application.
+
+.Specifying a custom number of acceptor processes
+
+[source,erlang]
+{ok, _} = ranch:start_listener(tcp_echo,
+	ranch_tcp, [{port, 5555}, {num_acceptors, 42}],
+	echo_protocol, []
+).
+
 === When running out of file descriptors
 
 Operating systems have limits on the number of sockets
@@ -278,7 +296,7 @@ calling `ranch:get_protocol_options/1`.
 [source,erlang]
 Opts = ranch:get_protocol_options(tcp_echo).
 
-=== Obtain information about listeners
+=== Obtaining information about listeners
 
 Ranch provides two functions for retrieving information about the
 listeners, for reporting and diagnostic purposes.
diff --git a/doc/src/guide/protocols.asciidoc b/doc/src/guide/protocols.asciidoc
index 48c74ef..b9a31f2 100644
--- a/doc/src/guide/protocols.asciidoc
+++ b/doc/src/guide/protocols.asciidoc
@@ -10,7 +10,7 @@ which defines a single callback, `start_link/4`. This callback is
 responsible for spawning a new process for handling the connection.
 It receives four arguments: the name of the listener, the socket, the
 transport handler being used and the protocol options defined in
-the call to `ranch:start_listener/6`. This callback must
+the call to `ranch:start_listener/5`. This callback must
 return `{ok, Pid}`, with `Pid` the pid of the new process.
 
 The newly started process can then freely initialize itself. However,
diff --git a/doc/src/guide/ssl_auth.asciidoc b/doc/src/guide/ssl_auth.asciidoc
index de0bbaf..de16107 100644
--- a/doc/src/guide/ssl_auth.asciidoc
+++ b/doc/src/guide/ssl_auth.asciidoc
@@ -49,7 +49,7 @@ the listener to enable this behavior.
 .Configure a listener for SSL authentication
 
 [source,erlang]
-{ok, _} = ranch:start_listener(my_ssl, 100,
+{ok, _} = ranch:start_listener(my_ssl,
 	ranch_ssl, [
 		{port, SSLPort},
 		{certfile, PathToCertfile},
diff --git a/doc/src/manual/ranch.asciidoc b/doc/src/manual/ranch.asciidoc
index 13380fd..e0244c8 100644
--- a/doc/src/manual/ranch.asciidoc
+++ b/doc/src/manual/ranch.asciidoc
@@ -28,6 +28,7 @@ code.
 opt() = {ack_timeout, timeout()}
 	| {connection_type, worker | supervisor}
 	| {max_connections, max_conns()}
+	| {num_acceptors, pos_integer()}
 	| {shutdown, timeout() | brutal_kill}
 	| {socket, any()}
 ----
@@ -51,6 +52,8 @@ connection_type (worker)::
 	Type of process that will handle the connection.
 max_connections (1024)::
 	Maximum number of active connections. Soft limit. Using `infinity` will disable the limit entirely.
+num_acceptors (10)::
+	Number of processes that accept connections.
 shutdown (5000)::
 	Maximum allowed time for children to stop on listener shutdown.
 socket::
diff --git a/examples/tcp_echo/src/tcp_echo_app.erl b/examples/tcp_echo/src/tcp_echo_app.erl
index 7fac685..63cbbb4 100644
--- a/examples/tcp_echo/src/tcp_echo_app.erl
+++ b/examples/tcp_echo/src/tcp_echo_app.erl
@@ -11,7 +11,7 @@
 %% API.
 
 start(_Type, _Args) ->
-	{ok, _} = ranch:start_listener(tcp_echo, 1,
+	{ok, _} = ranch:start_listener(tcp_echo,
 		ranch_tcp, [{port, 5555}], echo_protocol, []),
 	tcp_echo_sup:start_link().
 
diff --git a/examples/tcp_reverse/src/tcp_reverse_app.erl b/examples/tcp_reverse/src/tcp_reverse_app.erl
index 106e527..1138d4a 100644
--- a/examples/tcp_reverse/src/tcp_reverse_app.erl
+++ b/examples/tcp_reverse/src/tcp_reverse_app.erl
@@ -11,7 +11,7 @@
 %% API.
 
 start(_Type, _Args) ->
-    {ok, _} = ranch:start_listener(tcp_reverse, 10,
+    {ok, _} = ranch:start_listener(tcp_reverse,
 		ranch_tcp, [{port, 5555}], reverse_protocol, []),
     tcp_reverse_sup:start_link().
 
diff --git a/src/ranch.erl b/src/ranch.erl
index 2ef6222..e835ad5 100644
--- a/src/ranch.erl
+++ b/src/ranch.erl
@@ -14,8 +14,10 @@
 
 -module(ranch).
 
+-export([start_listener/5]).
 -export([start_listener/6]).
 -export([stop_listener/1]).
+-export([child_spec/5]).
 -export([child_spec/6]).
 -export([accept_ack/1]).
 -export([remove_connection/1]).
@@ -31,12 +33,15 @@
 -export([set_option_default/3]).
 -export([require/1]).
 
+-deprecated([start_listener/6, child_spec/6]).
+
 -type max_conns() :: non_neg_integer() | infinity.
 -export_type([max_conns/0]).
 
 -type opt() :: {ack_timeout, timeout()}
 	| {connection_type, worker | supervisor}
 	| {max_connections, max_conns()}
+	| {num_acceptors, pos_integer()}
 	| {shutdown, timeout() | brutal_kill}
 	| {socket, any()}.
 -export_type([opt/0]).
@@ -44,6 +49,12 @@
 -type ref() :: any().
 -export_type([ref/0]).
 
+-spec start_listener(ref(), module(), any(), module(), any())
+	-> supervisor:startchild_ret().
+start_listener(Ref, Transport, TransOpts, Protocol, ProtoOpts) ->
+	NumAcceptors = proplists:get_value(num_acceptors, TransOpts, 10),
+	start_listener(Ref, NumAcceptors, Transport, TransOpts, Protocol, ProtoOpts).
+
 -spec start_listener(ref(), non_neg_integer(), module(), any(), module(), any())
 	-> supervisor:startchild_ret().
 start_listener(Ref, NumAcceptors, Transport, TransOpts, Protocol, ProtoOpts)
@@ -99,6 +110,12 @@ stop_listener(Ref) ->
 			{error, Reason}
 	end.
 
+-spec child_spec(ref(), module(), any(), module(), any())
+	-> supervisor:child_spec().
+child_spec(Ref, Transport, TransOpts, Protocol, ProtoOpts) ->
+	NumAcceptors = proplists:get_value(num_acceptors, TransOpts, 10),
+	child_spec(Ref, NumAcceptors, Transport, TransOpts, Protocol, ProtoOpts).
+
 -spec child_spec(ref(), non_neg_integer(), module(), any(), module(), any())
 	-> supervisor:child_spec().
 child_spec(Ref, NumAcceptors, Transport, TransOpts, Protocol, ProtoOpts)
diff --git a/src/ranch_acceptors_sup.erl b/src/ranch_acceptors_sup.erl
index 24cce2b..7092ab8 100644
--- a/src/ranch_acceptors_sup.erl
+++ b/src/ranch_acceptors_sup.erl
@@ -30,8 +30,9 @@ init([Ref, NumAcceptors, Transport, TransOpts]) ->
 			TransOpts2 = proplists:delete(ack_timeout,
 				proplists:delete(connection_type,
 				proplists:delete(max_connections,
+				proplists:delete(num_acceptors,
 				proplists:delete(shutdown,
-				proplists:delete(socket, TransOpts))))),
+				proplists:delete(socket, TransOpts)))))),
 			case Transport:listen(TransOpts2) of
 				{ok, Socket} -> Socket;
 				{error, Reason} -> listen_error(Ref, Transport, TransOpts2, Reason)
diff --git a/test/acceptor_SUITE.erl b/test/acceptor_SUITE.erl
index 878caee..b771857 100644
--- a/test/acceptor_SUITE.erl
+++ b/test/acceptor_SUITE.erl
@@ -67,28 +67,31 @@ groups() ->
 
 misc_bad_transport(_) ->
 	doc("Reject invalid transport modules."),
-	{error, badarg} = ranch:start_listener(misc_bad_transport, 1,
+	{error, badarg} = ranch:start_listener(misc_bad_transport,
 		bad_transport, [], echo_protocol, []),
 	ok.
 
 misc_bad_transport_options(_) ->
 	doc("Ignore invalid transport options."),
-	{ok, _} = ranch:start_listener(misc_bad_transport, 1,
+	{ok, _} = ranch:start_listener(misc_bad_transport,
 		ranch_tcp, [binary, {packet, 4}, <<"garbage">>, raw, backlog], echo_protocol, []),
 	ok.
 
 misc_info(_) ->
 	doc("Information about listeners."),
 	%% Open a listener with a few connections.
-	{ok, Pid1} = ranch:start_listener({misc_info, tcp}, 1, ranch_tcp, [],
+	{ok, Pid1} = ranch:start_listener({misc_info, tcp},
+		ranch_tcp, [{num_acceptors, 1}],
 		remove_conn_and_wait_protocol, [{remove, true, 2500}]),
 	Port1 = ranch:get_port({misc_info, tcp}),
 	%% Open a few more listeners with different arguments.
-	{ok, Pid2} = ranch:start_listener({misc_info, act}, 2, ranch_tcp, [], active_echo_protocol, {}),
+	{ok, Pid2} = ranch:start_listener({misc_info, act},
+		ranch_tcp, [{num_acceptors, 2}], active_echo_protocol, {}),
 	Port2 = ranch:get_port({misc_info, act}),
 	ranch:set_max_connections({misc_info, act}, infinity),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, Pid3} = ranch:start_listener({misc_info, ssl}, 3, ranch_ssl, Opts, echo_protocol, [{}]),
+	{ok, Pid3} = ranch:start_listener({misc_info, ssl},
+		ranch_ssl, [{num_acceptors, 3}|Opts], echo_protocol, [{}]),
 	Port3 = ranch:get_port({misc_info, ssl}),
 	%% Open 5 connections, 3 removed from the count.
 	{ok, _} = gen_tcp:connect("localhost", Port1, [binary, {active, false}, {packet, raw}]),
@@ -111,7 +114,7 @@ misc_info(_) ->
 			{active_connections, 0},
 			{all_connections, 0},
 			{transport, ranch_tcp},
-			{transport_options, []},
+			{transport_options, [{num_acceptors, 2}]},
 			{protocol, active_echo_protocol},
 			{protocol_options, {}}
 		]},
@@ -124,7 +127,7 @@ misc_info(_) ->
 			{active_connections, 0},
 			{all_connections, 0},
 			{transport, ranch_ssl},
-			{transport_options, Opts},
+			{transport_options, [{num_acceptors, 3}|Opts]},
 			{protocol, echo_protocol},
 			{protocol_options, [{}]}
 		]},
@@ -137,7 +140,7 @@ misc_info(_) ->
 			{active_connections, 2},
 			{all_connections, 5},
 			{transport, ranch_tcp},
-			{transport_options, []},
+			{transport_options, [{num_acceptors, 1}]},
 			{protocol, remove_conn_and_wait_protocol},
 			{protocol_options, [{remove, false, 2500}]} %% Option was modified.
 		]}
@@ -158,7 +161,8 @@ ssl_accept_error(_) ->
 	doc("Acceptor must not crash if client disconnects in the middle of SSL handshake."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, ListenerSup} = ranch:start_listener(Name, 1, ranch_ssl, Opts, echo_protocol, []),
+	{ok, ListenerSup} = ranch:start_listener(Name,
+		ranch_ssl, [{num_acceptors, 1}|Opts], echo_protocol, []),
 	Port = ranch:get_port(Name),
 	ListenerSupChildren = supervisor:which_children(ListenerSup),
 	{_, AcceptorsSup, _, _} = lists:keyfind(ranch_acceptors_sup, 1, ListenerSupChildren),
@@ -175,7 +179,7 @@ ssl_accept_socket(_) ->
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
 	{ok, S} = ssl:listen(0, [binary, {active, false}, {packet, raw}, {reuseaddr, true}|Opts]),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_ssl, [{socket, S}], echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_ssl, [{socket, S}], echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = ssl:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = ssl:send(Socket, <<"TCP Ranch is working!">>),
@@ -190,7 +194,7 @@ ssl_active_echo(_) ->
 	doc("Ensure that active mode works with SSL transport."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_ssl, Opts, active_echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_ssl, Opts, active_echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = ssl:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = ssl:send(Socket, <<"SSL Ranch is working!">>),
@@ -205,7 +209,7 @@ ssl_echo(_) ->
 	doc("Ensure that passive mode works with SSL transport."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_ssl, Opts, echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_ssl, Opts, echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = ssl:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = ssl:send(Socket, <<"SSL Ranch is working!">>),
@@ -228,7 +232,7 @@ do_ssl_sni_echo() ->
 	doc("Ensure that SNI works with SSL transport."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_ssl, [{sni_hosts, [{"localhost", Opts}]}], echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_ssl, [{sni_hosts, [{"localhost", Opts}]}], echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = ssl:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = ssl:send(Socket, <<"SSL Ranch is working!">>),
@@ -251,7 +255,7 @@ do_ssl_sni_fail() ->
 	doc("Ensure that connection fails when host is not in SNI list."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_ssl, [{sni_hosts, [{"pouet", Opts}]}], echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_ssl, [{sni_hosts, [{"pouet", Opts}]}], echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{error, _} = ssl:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = ranch:stop_listener(Name),
@@ -263,9 +267,9 @@ ssl_error_eaddrinuse(_) ->
 	doc("Ensure that failure due to an eaddrinuse returns a compact readable error."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_ssl, Opts, active_echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_ssl, Opts, active_echo_protocol, []),
 	Port = ranch:get_port(Name),
-	{error, eaddrinuse} = ranch:start_listener({Name, fails}, 1,
+	{error, eaddrinuse} = ranch:start_listener({Name, fails},
 		ranch_ssl, [{port, Port}|Opts], active_echo_protocol, []),
 	ok = ranch:stop_listener(Name),
 	%% Make sure the listener stopped.
@@ -274,14 +278,14 @@ ssl_error_eaddrinuse(_) ->
 
 ssl_error_no_cert(_) ->
 	doc("Ensure that failure due to missing certificate returns a compact readable error."),
-	{error, no_cert} = ranch:start_listener(name(), 1, ranch_ssl, [], active_echo_protocol, []),
+	{error, no_cert} = ranch:start_listener(name(), ranch_ssl, [], active_echo_protocol, []),
 	ok.
 
 ssl_error_eacces(_) ->
 	doc("Ensure that failure due to an eacces returns a compact readable error."),
 	Name = name(),
 	Opts = ct_helper:get_certs_from_ets(),
-	{error, eacces} = ranch:start_listener(Name, 1,
+	{error, eacces} = ranch:start_listener(Name,
 		ranch_ssl, [{port, 283}|Opts], active_echo_protocol, []),
 	ok.
 
@@ -291,7 +295,7 @@ tcp_accept_socket(_) ->
 	doc("Ensure that listener can use an externally opened TCP listen socket."),
 	Name = name(),
 	{ok, S} = gen_tcp:listen(0, [binary, {active, false}, {packet, raw}, {reuseaddr, true}]),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_tcp, [{socket, S}], echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, [{socket, S}], echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = gen_tcp:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = gen_tcp:send(Socket, <<"TCP Ranch is working!">>),
@@ -305,7 +309,7 @@ tcp_accept_socket(_) ->
 tcp_active_echo(_) ->
 	doc("Ensure that active mode works with TCP transport."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_tcp, [], active_echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, [], active_echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = gen_tcp:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = gen_tcp:send(Socket, <<"TCP Ranch is working!">>),
@@ -319,7 +323,7 @@ tcp_active_echo(_) ->
 tcp_echo(_) ->
 	doc("Ensure that passive mode works with TCP transport."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_tcp, [], echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, [], echo_protocol, []),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = gen_tcp:connect("localhost", Port, [binary, {active, false}, {packet, raw}]),
 	ok = gen_tcp:send(Socket, <<"TCP Ranch is working!">>),
@@ -334,7 +338,7 @@ tcp_inherit_options(_) ->
 	doc("Ensure TCP options are inherited in the protocol."),
 	Name = name(),
 	Opts = [{nodelay, false}, {send_timeout_close, false}],
-	{ok, _} = ranch:start_listener(Name, 4, ranch_tcp, Opts, check_tcp_options, [{pid, self()} | Opts]),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, Opts, check_tcp_options, [{pid, self()} | Opts]),
 	Port = ranch:get_port(Name),
 	{ok, Socket} = gen_tcp:connect("localhost", Port, [binary, {active, true}, {packet, raw}]),
 	receive checked -> ok after 1000 -> error(timeout) end,
@@ -344,8 +348,8 @@ tcp_inherit_options(_) ->
 tcp_max_connections(_) ->
 	doc("Ensure the max_connections option actually limits connections."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
-		ranch_tcp, [{max_connections, 10}],
+	{ok, _} = ranch:start_listener(Name,
+		ranch_tcp, [{max_connections, 10}, {num_acceptors, 1}],
 		notify_and_wait_protocol, [{msg, connected}, {pid, self()}]),
 	Port = ranch:get_port(Name),
 	ok = connect_loop(Port, 11, 150),
@@ -357,8 +361,8 @@ tcp_max_connections(_) ->
 tcp_max_connections_and_beyond(_) ->
 	doc("Ensure the max_connections option works when connections are removed from the count."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
-		ranch_tcp, [{max_connections, 10}],
+	{ok, _} = ranch:start_listener(Name,
+		ranch_tcp, [{max_connections, 10}, {num_acceptors, 1}],
 		remove_conn_and_wait_protocol, [{remove, true, 2500}]),
 	Port = ranch:get_port(Name),
 	ok = connect_loop(Port, 10, 0),
@@ -384,8 +388,8 @@ tcp_max_connections_and_beyond(_) ->
 tcp_max_connections_infinity(_) ->
 	doc("Set the max_connections option from 10 to infinity and back to 10."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
-		ranch_tcp, [{max_connections, 10}],
+	{ok, _} = ranch:start_listener(Name,
+		ranch_tcp, [{max_connections, 10}, {num_acceptors, 1}],
 		notify_and_wait_protocol, [{msg, connected}, {pid, self()}]),
 	Port = ranch:get_port(Name),
 	ok = connect_loop(Port, 20, 0),
@@ -405,7 +409,7 @@ tcp_max_connections_infinity(_) ->
 tcp_remove_connections(_) ->
 	doc("Ensure that removed connections are only removed once."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
+	{ok, _} = ranch:start_listener(Name,
 		ranch_tcp, [],
 		remove_conn_and_wait_protocol, [{remove, true, 0}]),
 	Port = ranch:get_port(Name),
@@ -417,8 +421,8 @@ tcp_remove_connections(_) ->
 tcp_set_max_connections(_) ->
 	doc("Ensure that changing the max_connections option to a larger value allows for more connections."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
-		ranch_tcp, [{max_connections, 10}],
+	{ok, _} = ranch:start_listener(Name,
+		ranch_tcp, [{max_connections, 10}, {num_acceptors, 1}],
 		notify_and_wait_protocol, [{msg, connected}, {pid, self()}]),
 	Port = ranch:get_port(Name),
 	ok = connect_loop(Port, 20, 0),
@@ -433,7 +437,7 @@ tcp_set_max_connections(_) ->
 tcp_set_max_connections_clean(_) ->
 	doc("Ensure that setting max_connections does not crash any process."),
 	Name = name(),
-	{ok, ListSupPid} = ranch:start_listener(Name, 4, ranch_tcp,
+	{ok, ListSupPid} = ranch:start_listener(Name, ranch_tcp,
 			[{max_connections, 4}],
 			notify_and_wait_protocol, [{msg, connected}, {pid, self()}]),
 	Children = supervisor:which_children(ListSupPid),
@@ -459,7 +463,7 @@ tcp_set_max_connections_clean(_) ->
 tcp_upgrade(_) ->
 	doc("Ensure that protocol options can be updated."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
+	{ok, _} = ranch:start_listener(Name,
 		ranch_tcp, [],
 		notify_and_wait_protocol, [{msg, connected}, {pid, self()}]),
 	Port = ranch:get_port(Name),
@@ -473,9 +477,9 @@ tcp_upgrade(_) ->
 tcp_error_eaddrinuse(_) ->
 	doc("Ensure that failure due to an eaddrinuse returns a compact readable error."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_tcp, [], active_echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, [], active_echo_protocol, []),
 	Port = ranch:get_port(Name),
-	{error, eaddrinuse} = ranch:start_listener({Name, fails}, 1,
+	{error, eaddrinuse} = ranch:start_listener({Name, fails},
 		ranch_tcp, [{port, Port}], active_echo_protocol, []),
 	ok = ranch:stop_listener(Name),
 	%% Make sure the listener stopped.
@@ -485,7 +489,7 @@ tcp_error_eaddrinuse(_) ->
 tcp_error_eacces(_) ->
 	doc("Ensure that failure due to an eacces returns a compact readable error."),
 	Name = name(),
-	{error, eacces} = ranch:start_listener(Name, 1,
+	{error, eacces} = ranch:start_listener(Name,
 		ranch_tcp, [{port, 283}], active_echo_protocol, []),
 	ok.
 
@@ -495,7 +499,7 @@ tcp_error_eacces(_) ->
 connection_type_supervisor(_) ->
 	doc("The supervisor connection type must be reflected in the specifications."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
+	{ok, _} = ranch:start_listener(Name,
 		ranch_tcp, [{connection_type, supervisor}],
 		echo_protocol, []),
 	Port = ranch:get_port(Name),
@@ -513,7 +517,7 @@ connection_type_supervisor(_) ->
 connection_type_supervisor_separate_from_connection(_) ->
 	doc("The supervisor connection type allows separate supervised and connection processes."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1,
+	{ok, _} = ranch:start_listener(Name,
 		ranch_tcp, [{connection_type, supervisor}],
 		supervisor_separate, []),
 	Port = ranch:get_port(Name),
@@ -537,7 +541,7 @@ supervisor_clean_child_restart(_) ->
 	1 = erlang:trace_pattern({ranch_tcp, listen, 1},
 		[{'_', [], [{return_trace}]}], [global]),
 	{ok, Pid} = ranch:start_listener(Name,
-		1, ranch_tcp, [], echo_protocol, []),
+		ranch_tcp, [{num_acceptors, 1}], echo_protocol, []),
 	%% Trace supervisor spawns.
 	1 = erlang:trace(Pid, true, [procs, set_on_spawn]),
 	ConnsSup = ranch_server:get_connections_sup(Name),
@@ -573,7 +577,7 @@ supervisor_clean_conns_sup_restart(_) ->
 		"the ranch_server process."),
 	Name = name(),
 	{ok, _} = ranch:start_listener(Name,
-		1, ranch_tcp, [], echo_protocol, []),
+		ranch_tcp, [], echo_protocol, []),
 	Server = erlang:whereis(ranch_server),
 	ServerMonRef = erlang:monitor(process, Server),
 	%% Exit because Name already registered and is alive.
@@ -592,7 +596,8 @@ supervisor_clean_restart(_) ->
 		"and that it restarts properly."),
 	Name = name(),
 	NumAcc = 4,
-	{ok, Pid} = ranch:start_listener(Name, NumAcc, ranch_tcp, [], echo_protocol, []),
+	{ok, Pid} = ranch:start_listener(Name,
+		ranch_tcp, [{num_acceptors, NumAcc}], echo_protocol, []),
 	%% Trace supervisor spawns.
 	1 = erlang:trace(Pid, true, [procs, set_on_spawn]),
 	ConnsSup0 = ranch_server:get_connections_sup(Name),
@@ -625,7 +630,7 @@ supervisor_conns_alive(_) ->
 	_ = erlang:trace(new, true, [call]),
 	1 = erlang:trace_pattern({ranch_tcp, listen, 1},
 		[{'_', [], [{return_trace}]}], [global]),
-	{ok, _} = ranch:start_listener(Name, 1,
+	{ok, _} = ranch:start_listener(Name,
 		ranch_tcp, [],
 		remove_conn_and_wait_protocol, [{remove, false, 2500}]),
 	%% Get the listener socket
@@ -652,7 +657,7 @@ supervisor_conns_alive(_) ->
 supervisor_protocol_start_link_crash(_) ->
 	doc("Ensure a protocol start crash does not kill all connections."),
 	Name = name(),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_tcp, [], crash_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, [], crash_protocol, []),
 	ConnsSup = ranch_server:get_connections_sup(Name),
 	Port = ranch:get_port(Name),
 	{ok, _} = gen_tcp:connect("localhost", Port, [binary, {active, true}, {packet, raw}]),
@@ -667,7 +672,7 @@ supervisor_server_recover_state(_) ->
 	_ = erlang:trace(new, true, [call]),
 	1 = erlang:trace_pattern({ranch_server, init, 1},
 		[{'_', [], [{return_trace}]}], [global]),
-	{ok, _} = ranch:start_listener(Name, 1, ranch_tcp, [], echo_protocol, []),
+	{ok, _} = ranch:start_listener(Name, ranch_tcp, [], echo_protocol, []),
 	ConnsSup = ranch_server:get_connections_sup(Name),
 	ServerPid = erlang:whereis(ranch_server),
 	{monitors, Monitors} = erlang:process_info(ServerPid, monitors),
diff --git a/test/shutdown_SUITE.erl b/test/shutdown_SUITE.erl
index e62a1a9..505b86a 100644
--- a/test/shutdown_SUITE.erl
+++ b/test/shutdown_SUITE.erl
@@ -28,7 +28,7 @@ all() ->
 brutal_kill(_) ->
 	doc("Shutdown Ranch listener with shutdown option set to brutal_kill."),
 	Name = name(),
-	{ok, ListenerSup} = ranch:start_listener(Name, 1,
+	{ok, ListenerSup} = ranch:start_listener(Name,
 		ranch_tcp, [{port, 0}, {shutdown, brutal_kill}],
 		echo_protocol, []),
 	Port = ranch:get_port(Name),
@@ -48,7 +48,7 @@ brutal_kill(_) ->
 infinity(_) ->
 	doc("Shutdown Ranch listener with shutdown option set to infinity."),
 	Name = name(),
-	{ok, ListenerSup} = ranch:start_listener(Name, 1,
+	{ok, ListenerSup} = ranch:start_listener(Name,
 		ranch_tcp, [{port, 0}, {shutdown, infinity}],
 		echo_protocol, []),
 	Port = ranch:get_port(Name),
@@ -70,7 +70,7 @@ infinity_trap_exit(_) ->
 		"and protocol process trapping exits. The listener must not stop "
 		"until the protocol process terminates."),
 	Name = name(),
-	{ok, ListenerSup} = ranch:start_listener(Name, 1,
+	{ok, ListenerSup} = ranch:start_listener(Name,
 		ranch_tcp, [{port, 0}, {shutdown, infinity}],
 		trap_exit_protocol, []),
 	Port = ranch:get_port(Name),
@@ -99,7 +99,7 @@ infinity_trap_exit(_) ->
 timeout(_) ->
 	doc("Shutdown Ranch listener with shutdown option set to 500ms."),
 	Name = name(),
-	{ok, ListenerSup} = ranch:start_listener(Name, 1,
+	{ok, ListenerSup} = ranch:start_listener(Name,
 		ranch_tcp, [{port, 0}, {shutdown, 500}],
 		echo_protocol, []),
 	Port = ranch:get_port(Name),
@@ -121,7 +121,7 @@ timeout_trap_exit(_) ->
 		"and protocol process trapping exits. The listener will only stop "
 		"after the 500ms timeout."),
 	Name = name(),
-	{ok, ListenerSup} = ranch:start_listener(Name, 1,
+	{ok, ListenerSup} = ranch:start_listener(Name,
 		ranch_tcp, [{port, 0}, {shutdown, 500}],
 		trap_exit_protocol, []),
 	Port = ranch:get_port(Name),