diff options
Diffstat (limited to 'lib/kernel/src/heart.erl')
| -rw-r--r-- | lib/kernel/src/heart.erl | 41 |
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. |