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authorBjörn-Egil Dahlberg <[email protected]>2016-02-15 15:28:38 +0100
committerBjörn-Egil Dahlberg <[email protected]>2016-02-15 15:28:38 +0100
commitd8ce99ba8dd966e87a61e50b70d01e7f1f381bf4 (patch)
tree5bea879c04e55023e0206e7f9b7d72b84e18bfbb /lib/kernel/src/heart.erl
parent84818479ea74a7084169f415b9253aa2ff6af69d (diff)
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kernel: Refactor heart code
Diffstat (limited to 'lib/kernel/src/heart.erl')
-rw-r--r--lib/kernel/src/heart.erl41
1 files changed, 22 insertions, 19 deletions
diff --git a/lib/kernel/src/heart.erl b/lib/kernel/src/heart.erl
index 464b6919f1..97f384b1d8 100644
--- a/lib/kernel/src/heart.erl
+++ b/lib/kernel/src/heart.erl
@@ -49,6 +49,9 @@
-define(CYCLE_TIMEOUT, 10000).
-define(HEART_PORT_NAME, heart_port).
+-record(state,{port :: port(),
+ cmd :: [] | binary()}).
+
%%---------------------------------------------------------------------
-spec start() -> 'ignore' | {'error', term()} | {'ok', pid()}.
@@ -85,7 +88,7 @@ init(Starter, Parent) ->
case catch start_portprogram() of
{ok, Port} ->
Starter ! {ok, self()},
- loop(Parent, Port, "");
+ loop(Parent, #state{port = Port, cmd = []});
no_heart ->
Starter ! {no_heart, self()};
error ->
@@ -182,7 +185,7 @@ wait_ack(Port) ->
{error, Reason}
end.
-loop(Parent, Port, Cmd) ->
+loop(Parent, #state{port=Port}=S) ->
_ = send_heart_beat(Port),
receive
{From, set_cmd, NewCmd0} ->
@@ -192,36 +195,36 @@ loop(Parent, Port, Cmd) ->
_ = send_heart_cmd(Port, NewCmd),
_ = wait_ack(Port),
From ! {heart, ok},
- loop(Parent, Port, NewCmd);
+ loop(Parent, S#state{cmd=NewCmd});
_ ->
From ! {heart, {error, {bad_cmd, NewCmd0}}},
- loop(Parent, Port, Cmd)
+ loop(Parent, S)
end;
{From, clear_cmd} ->
From ! {heart, ok},
- _ = send_heart_cmd(Port, ""),
+ _ = send_heart_cmd(Port, []),
_ = wait_ack(Port),
- loop(Parent, Port, "");
+ loop(Parent, S#state{cmd = []});
{From, get_cmd} ->
From ! {heart, get_heart_cmd(Port)},
- loop(Parent, Port, Cmd);
+ loop(Parent, S);
{From, cycle} ->
%% Calls back to loop
- do_cycle_port_program(From, Parent, Port, Cmd);
+ do_cycle_port_program(From, Parent, S);
{'EXIT', Parent, shutdown} ->
no_reboot_shutdown(Port);
{'EXIT', Parent, Reason} ->
exit(Port, Reason),
exit(Reason);
{'EXIT', Port, badsig} -> % we can ignore badsig-messages!
- loop(Parent, Port, Cmd);
+ loop(Parent, S);
{'EXIT', Port, _Reason} ->
- exit({port_terminated, {heart, loop, [Parent, Port, Cmd]}});
+ exit({port_terminated, {heart, loop, [Parent, S]}});
_ ->
- loop(Parent, Port, Cmd)
+ loop(Parent, S)
after
?TIMEOUT ->
- loop(Parent, Port, Cmd)
+ loop(Parent, S)
end.
-spec no_reboot_shutdown(port()) -> no_return().
@@ -233,31 +236,31 @@ no_reboot_shutdown(Port) ->
exit(normal)
end.
-do_cycle_port_program(Caller, Parent, Port, Cmd) ->
+do_cycle_port_program(Caller, Parent, #state{port=Port} = S) ->
unregister(?HEART_PORT_NAME),
case catch start_portprogram() of
{ok, NewPort} ->
_ = send_shutdown(Port),
receive
{'EXIT', Port, _Reason} ->
- _ = send_heart_cmd(NewPort, Cmd),
+ _ = send_heart_cmd(NewPort, S#state.cmd),
Caller ! {heart, ok},
- loop(Parent, NewPort, Cmd)
+ loop(Parent, S#state{port=NewPort})
after
?CYCLE_TIMEOUT ->
%% Huh! Two heart port programs running...
%% well, the old one has to be sick not to respond
%% so we'll settle for the new one...
- _ = send_heart_cmd(NewPort, Cmd),
+ _ = send_heart_cmd(NewPort, S#state.cmd),
Caller ! {heart, {error, stop_error}},
- loop(Parent, NewPort, Cmd)
+ loop(Parent, S#state{port=NewPort})
end;
no_heart ->
Caller ! {heart, {error, no_heart}},
- loop(Parent, Port, Cmd);
+ loop(Parent, S);
error ->
Caller ! {heart, {error, start_error}},
- loop(Parent, Port, Cmd)
+ loop(Parent, S)
end.