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Make fold_worker link to the consumer

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This should ensure proper cleanup if a process
calling fold exits while folding.
This commit is contained in:
Kresten Krab Thorup 2012-04-18 09:25:47 +02:00
parent 454a111ad7
commit c3f916c350
1 changed files with 7 additions and 3 deletions
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10
src/lsm_btree_fold_worker.erl
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@ -67,6 +67,7 @@ start(SendTo) ->
PID = plain_fsm:spawn(?MODULE,
fun() ->
process_flag(trap_exit,true),
link(SendTo),
initialize(#state{sendto=SendTo}, [])
end),
{ok, PID}.
@ -124,10 +125,9 @@ fill(State, Values, [PID|Rest]=PIDs) ->
emit_next(State, []) ->
State#state.sendto ! {fold_done, self()},
ok;
end_of_fold(State);
emit_next(State, [{FirstPID,FirstKV}|Rest]=Values) ->
case
lists:foldl(fun({P,{K1,_}=KV}, {{K2,_},_}) when K1 < K2 ->
{KV,[P]};
@ -142,12 +142,16 @@ emit_next(State, [{FirstPID,FirstKV}|Rest]=Values) ->
{{_, ?TOMBSTONE}, FillFrom} ->
fill(State, Values, FillFrom);
{{Key, limit}, _} ->
State#state.sendto ! {fold_limit, self(), Key};
State#state.sendto ! {fold_limit, self(), Key},
end_of_fold(State);
{{FoundKey, FoundValue}, FillFrom} ->
State#state.sendto ! {fold_result, self(), FoundKey, FoundValue},
fill(State, Values, FillFrom)
end.
end_of_fold(State) ->
unlink(State#state.sendto),
ok.
data_vsn() ->
5.