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authorFredrik Gustafsson <[email protected]>2013-04-15 11:19:52 +0200
committerFredrik Gustafsson <[email protected]>2013-04-15 11:19:52 +0200
commitf7641c8aafecc7b54b3f6f226892f825ac19f63a (patch)
tree318244a96862eabbfe1d3b090c63670db1ccb6f4 /lib/kernel
parent656b37f1b6fbc3611f5e0f8b8c0e4f61bef9092b (diff)
parent9f2c736e273aed9034aeab2d2877b5c52cc8d327 (diff)
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Merge branch 'nox/file-receive-optim/OTP-11040' into maint
* nox/file-receive-optim/OTP-11040: Optimize communication with file io server
Diffstat (limited to 'lib/kernel')
-rw-r--r--lib/kernel/src/file.erl43
-rw-r--r--lib/kernel/test/file_SUITE.erl29
2 files changed, 42 insertions, 30 deletions
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index a4c56b346f..36289053eb 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -480,8 +480,7 @@ open(Item, Mode) ->
Reason :: posix() | badarg | terminated.
close(File) when is_pid(File) ->
- R = file_request(File, close),
- case wait_file_reply(File, R) of
+ case file_request(File, close) of
{error, terminated} ->
ok;
Other ->
@@ -503,8 +502,7 @@ close(_) ->
Reason :: posix() | badarg.
advise(File, Offset, Length, Advise) when is_pid(File) ->
- R = file_request(File, {advise, Offset, Length, Advise}),
- wait_file_reply(File, R);
+ file_request(File, {advise, Offset, Length, Advise});
advise(#file_descriptor{module = Module} = Handle, Offset, Length, Advise) ->
Module:advise(Handle, Offset, Length, Advise);
advise(_, _, _, _) ->
@@ -517,8 +515,7 @@ advise(_, _, _, _) ->
Length :: non_neg_integer().
allocate(File, Offset, Length) when is_pid(File) ->
- R = file_request(File, {allocate, Offset, Length}),
- wait_file_reply(File, R);
+ file_request(File, {allocate, Offset, Length});
allocate(#file_descriptor{module = Module} = Handle, Offset, Length) ->
Module:allocate(Handle, Offset, Length).
@@ -601,8 +598,7 @@ pread_int(_, _, _) ->
Reason :: posix() | badarg | terminated.
pread(File, At, Sz) when is_pid(File), is_integer(Sz), Sz >= 0 ->
- R = file_request(File, {pread, At, Sz}),
- wait_file_reply(File, R);
+ file_request(File, {pread, At, Sz});
pread(#file_descriptor{module = Module} = Handle, Offs, Sz)
when is_integer(Sz), Sz >= 0 ->
Module:pread(Handle, Offs, Sz);
@@ -658,8 +654,7 @@ pwrite_int(_, _, _) ->
Reason :: posix() | badarg | terminated.
pwrite(File, At, Bytes) when is_pid(File) ->
- R = file_request(File, {pwrite, At, Bytes}),
- wait_file_reply(File, R);
+ file_request(File, {pwrite, At, Bytes});
pwrite(#file_descriptor{module = Module} = Handle, Offs, Bytes) ->
Module:pwrite(Handle, Offs, Bytes);
pwrite(_, _, _) ->
@@ -670,8 +665,7 @@ pwrite(_, _, _) ->
Reason :: posix() | badarg | terminated.
datasync(File) when is_pid(File) ->
- R = file_request(File, datasync),
- wait_file_reply(File, R);
+ file_request(File, datasync);
datasync(#file_descriptor{module = Module} = Handle) ->
Module:datasync(Handle);
datasync(_) ->
@@ -682,8 +676,7 @@ datasync(_) ->
Reason :: posix() | badarg | terminated.
sync(File) when is_pid(File) ->
- R = file_request(File, sync),
- wait_file_reply(File, R);
+ file_request(File, sync);
sync(#file_descriptor{module = Module} = Handle) ->
Module:sync(Handle);
sync(_) ->
@@ -696,8 +689,7 @@ sync(_) ->
Reason :: posix() | badarg | terminated.
position(File, At) when is_pid(File) ->
- R = file_request(File, {position,At}),
- wait_file_reply(File, R);
+ file_request(File, {position,At});
position(#file_descriptor{module = Module} = Handle, At) ->
Module:position(Handle, At);
position(_, _) ->
@@ -708,8 +700,7 @@ position(_, _) ->
Reason :: posix() | badarg | terminated.
truncate(File) when is_pid(File) ->
- R = file_request(File, truncate),
- wait_file_reply(File, R);
+ file_request(File, truncate);
truncate(#file_descriptor{module = Module} = Handle) ->
Module:truncate(Handle);
truncate(_) ->
@@ -1497,25 +1488,19 @@ check_args([]) ->
ok.
%%-----------------------------------------------------------------
-%% Functions for communicating with a file io server.
+%% Function for communicating with a file io server.
%% The messages sent have the following formats:
%%
%% {file_request,From,ReplyAs,Request}
%% {file_reply,ReplyAs,Reply}
file_request(Io, Request) ->
- R = erlang:monitor(process, Io),
- Io ! {file_request,self(),Io,Request},
- R.
-
-wait_file_reply(From, Ref) ->
+ Ref = erlang:monitor(process, Io),
+ Io ! {file_request,self(),Ref,Request},
receive
- {file_reply,From,Reply} ->
- erlang:demonitor(Ref),
- receive {'DOWN', Ref, _, _, _} -> ok after 0 -> ok end,
- %% receive {'EXIT', From, _} -> ok after 0 -> ok end,
+ {file_reply,Ref,Reply} ->
+ erlang:demonitor(Ref, [flush]),
Reply;
{'DOWN', Ref, _, _, _} ->
- %% receive {'EXIT', From, _} -> ok after 0 -> ok end,
{error, terminated}
end.
diff --git a/lib/kernel/test/file_SUITE.erl b/lib/kernel/test/file_SUITE.erl
index c604e7073f..4218cfa646 100644
--- a/lib/kernel/test/file_SUITE.erl
+++ b/lib/kernel/test/file_SUITE.erl
@@ -91,6 +91,8 @@
-export([standard_io/1,mini_server/1]).
+-export([old_io_protocol/1]).
+
%% Debug exports
-export([create_file_slow/2, create_file/2, create_bin/2]).
-export([verify_file/2, verify_bin/3]).
@@ -114,7 +116,7 @@ all() ->
delayed_write, read_ahead, segment_read, segment_write,
ipread, pid2name, interleaved_read_write, otp_5814, otp_10852,
large_file, large_write, read_line_1, read_line_2, read_line_3,
- read_line_4, standard_io].
+ read_line_4, standard_io, old_io_protocol].
groups() ->
[{dirs, [], [make_del_dir, cur_dir_0, cur_dir_1,
@@ -310,6 +312,31 @@ standard_io(Config) when is_list(Config) ->
Pid ! die,
receive after 1000 -> ok end.
+old_io_protocol(suite) ->
+ [];
+old_io_protocol(doc) ->
+ ["Test that the old file IO protocol =< R16B still works"];
+old_io_protocol(Config) when is_list(Config) ->
+ Dog = test_server:timetrap(test_server:seconds(5)),
+ RootDir = ?config(priv_dir,Config),
+ Name = filename:join(RootDir,
+ atom_to_list(?MODULE)
+ ++"old_io_protocol.fil"),
+ MyData = "0123456789abcdefghijklmnopqrstuvxyz",
+ ok = ?FILE_MODULE:write_file(Name, MyData),
+ {ok, Fd} = ?FILE_MODULE:open(Name, write),
+ Fd ! {file_request,self(),Fd,truncate},
+ receive
+ {file_reply,Fd,ok} -> ok
+ end,
+ ok = ?FILE_MODULE:close(Fd),
+ {ok, <<>>} = ?FILE_MODULE:read_file(Name),
+ test_server:timetrap_cancel(Dog),
+ [] = flush(),
+ ok.
+
+
+
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
read_write_file(suite) -> [];