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-rw-r--r--lib/kernel/src/user_drv.erl48
1 files changed, 25 insertions, 23 deletions
diff --git a/lib/kernel/src/user_drv.erl b/lib/kernel/src/user_drv.erl
index 380c685869..d3deca3a20 100644
--- a/lib/kernel/src/user_drv.erl
+++ b/lib/kernel/src/user_drv.erl
@@ -135,7 +135,7 @@ server1(Iport, Oport, Shell) ->
Iport, Oport),
%% Enter the server loop.
- server_loop(Iport, Oport, Curr, User, Gr, queue:new()).
+ server_loop(Iport, Oport, Curr, User, Gr, {false, queue:new()}).
rem_sh_opts(Node) ->
[{expand_fun,fun(B)-> rpc:call(Node,edlin_expand,expand,[B]) end}].
@@ -165,7 +165,7 @@ server_loop(Iport, Oport, User, Gr, IOQueue) ->
put(current_group, Curr),
server_loop(Iport, Oport, Curr, User, Gr, IOQueue).
-server_loop(Iport, Oport, Curr, User, Gr, IOQueue) ->
+server_loop(Iport, Oport, Curr, User, Gr, {Resp, IOQ} = IOQueue) ->
receive
{Iport,{data,Bs}} ->
BsBin = list_to_binary(Bs),
@@ -182,9 +182,9 @@ server_loop(Iport, Oport, Curr, User, Gr, IOQueue) ->
{Oport,ok} ->
%% We get this ok from the port, in io_request we store
%% info about where to send reply at head of queue
- {{value,{Origin,Reply}},ReplyQ} = queue:out(IOQueue),
+ {Origin,Reply} = Resp,
Origin ! {reply,Reply},
- NewQ = handle_req(next, Iport, Oport, ReplyQ),
+ NewQ = handle_req(next, Iport, Oport, {false, IOQ}),
server_loop(Iport, Oport, Curr, User, Gr, NewQ);
{'EXIT',Iport,_R} ->
server_loop(Iport, Oport, Curr, User, Gr, IOQueue);
@@ -238,28 +238,30 @@ handle_req({Curr,get_unicode_state},Iport,_Oport,IOQueue) ->
handle_req({Curr,set_unicode_state, Bool},Iport,_Oport,IOQueue) ->
Curr ! {self(),set_unicode_state,set_unicode_state(Iport,Bool)},
IOQueue;
-handle_req(next,Iport,Oport,IOQueue) ->
- case queue:out(IOQueue) of
- {{value,Next},ExecQ} ->
- NewQ = handle_req(Next,Iport,Oport,queue:new()),
- queue:join(NewQ,ExecQ);
+handle_req(next,Iport,Oport,{false,IOQ}=IOQueue) ->
+ case queue:out(IOQ) of
{empty,_} ->
- IOQueue
- end;
-handle_req(Msg,Iport,Oport,IOQueue) ->
- case queue:peek(IOQueue) of
- empty ->
- {Origin,Req} = Msg,
+ IOQueue;
+ {{value,{Origin,Req}},ExecQ} ->
case io_request(Req, Iport, Oport) of
- ok -> IOQueue;
+ ok ->
+ handle_req(next,Iport,Oport,{false,ExecQ});
Reply ->
- %% Push reply info to front of queue
- queue:in_r({Origin,Reply},IOQueue)
- end;
- _Else ->
- %% All requests are queued when we have outstanding sync put_chars
- queue:in(Msg,IOQueue)
- end.
+ {{Origin,Reply}, ExecQ}
+ end
+ end;
+handle_req(Msg,Iport,Oport,{false,IOQ}=IOQueue) ->
+ empty = queue:peek(IOQ),
+ {Origin,Req} = Msg,
+ case io_request(Req, Iport, Oport) of
+ ok ->
+ IOQueue;
+ Reply ->
+ {{Origin,Reply}, IOQ}
+ end;
+handle_req(Msg,_Iport,_Oport,{Resp, IOQ}) ->
+ %% All requests are queued when we have outstanding sync put_chars
+ {Resp, queue:in(Msg,IOQ)}.
%% port_bytes(Bytes, InPort, OutPort, CurrentProcess, UserProcess, Group)
%% Check the Bytes from the port to see if it contains a ^G. If so,