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authorHenrik Nord <[email protected]>2011-10-20 14:39:42 +0200
committerHenrik Nord <[email protected]>2011-10-20 14:39:42 +0200
commit45b4d5309e0686cc5fa28506de76f75b598bbd95 (patch)
treebd4d54a6de38654f49908b38c311718b74593a33 /lib/stdlib/src/supervisor.erl
parente21bc712b95b878afd9ab3d93ac27ded0bce7ccf (diff)
parent04731323678eff58f709b36f864d12aa08cfe6d9 (diff)
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Merge branch 'cf/simple_one_for_one_shutdown'
* cf/simple_one_for_one_shutdown: Explain how dynamic child processes are stopped Stack errors when dynamic children are stopped Explicitly kill dynamic children in supervisors Conflicts: lib/stdlib/doc/src/supervisor.xml OTP-9647
Diffstat (limited to 'lib/stdlib/src/supervisor.erl')
-rw-r--r--lib/stdlib/src/supervisor.erl121
1 files changed, 116 insertions, 5 deletions
diff --git a/lib/stdlib/src/supervisor.erl b/lib/stdlib/src/supervisor.erl
index 051dca462b..f20ea18fd0 100644
--- a/lib/stdlib/src/supervisor.erl
+++ b/lib/stdlib/src/supervisor.erl
@@ -515,9 +515,12 @@ handle_info(Msg, State) ->
%%
-spec terminate(term(), state()) -> 'ok'.
+terminate(_Reason, #state{children=[Child]} = State) when ?is_simple(State) ->
+ terminate_dynamic_children(Child, dynamics_db(Child#child.restart_type,
+ State#state.dynamics),
+ State#state.name);
terminate(_Reason, State) ->
- terminate_children(State#state.children, State#state.name),
- ok.
+ terminate_children(State#state.children, State#state.name).
%%
%% Change code for the supervisor.
@@ -830,8 +833,109 @@ monitor_child(Pid) ->
%% that will be handled in shutdown/2.
ok
end.
-
-
+
+
+%%-----------------------------------------------------------------
+%% Func: terminate_dynamic_children/3
+%% Args: Child = child_rec()
+%% Dynamics = ?DICT() | ?SET()
+%% SupName = {local, atom()} | {global, atom()} | {pid(),Mod}
+%% Returns: ok
+%%
+%%
+%% Shutdown all dynamic children. This happens when the supervisor is
+%% stopped. Because the supervisor can have millions of dynamic children, we
+%% can have an significative overhead here.
+%%-----------------------------------------------------------------
+terminate_dynamic_children(Child, Dynamics, SupName) ->
+ {Pids, EStack0} = monitor_dynamic_children(Child, Dynamics),
+ Sz = ?SETS:size(Pids),
+ EStack = case Child#child.shutdown of
+ brutal_kill ->
+ ?SETS:fold(fun(P, _) -> exit(P, kill) end, ok, Pids),
+ wait_dynamic_children(Child, Pids, Sz, undefined, EStack0);
+ infinity ->
+ ?SETS:fold(fun(P, _) -> exit(P, shutdown) end, ok, Pids),
+ wait_dynamic_children(Child, Pids, Sz, undefined, EStack0);
+ Time ->
+ ?SETS:fold(fun(P, _) -> exit(P, shutdown) end, ok, Pids),
+ TRef = erlang:start_timer(Time, self(), kill),
+ wait_dynamic_children(Child, Pids, Sz, TRef, EStack0)
+ end,
+ %% Unrool stacked errors and report them
+ ?DICT:fold(fun(Reason, Ls, _) ->
+ report_error(shutdown_error, Reason,
+ Child#child{pid=Ls}, SupName)
+ end, ok, EStack).
+
+
+monitor_dynamic_children(#child{restart_type=temporary}, Dynamics) ->
+ ?SETS:fold(fun(P, {Pids, EStack}) ->
+ case monitor_child(P) of
+ ok ->
+ {?SETS:add_element(P, Pids), EStack};
+ {error, normal} ->
+ {Pids, EStack};
+ {error, Reason} ->
+ {Pids, ?DICT:append(Reason, P, EStack)}
+ end
+ end, {?SETS:new(), ?DICT:new()}, Dynamics);
+monitor_dynamic_children(#child{restart_type=RType}, Dynamics) ->
+ ?DICT:fold(fun(P, _, {Pids, EStack}) ->
+ case monitor_child(P) of
+ ok ->
+ {?SETS:add_element(P, Pids), EStack};
+ {error, normal} when RType =/= permanent ->
+ {Pids, EStack};
+ {error, Reason} ->
+ {Pids, ?DICT:append(Reason, P, EStack)}
+ end
+ end, {?SETS:new(), ?DICT:new()}, Dynamics).
+
+
+wait_dynamic_children(_Child, _Pids, 0, undefined, EStack) ->
+ EStack;
+wait_dynamic_children(_Child, _Pids, 0, TRef, EStack) ->
+ %% If the timer has expired before its cancellation, we must empty the
+ %% mail-box of the 'timeout'-message.
+ erlang:cancel_timer(TRef),
+ receive
+ {timeout, TRef, kill} ->
+ EStack
+ after 0 ->
+ EStack
+ end;
+wait_dynamic_children(#child{shutdown=brutal_kill} = Child, Pids, Sz,
+ TRef, EStack) ->
+ receive
+ {'DOWN', _MRef, process, Pid, killed} ->
+ wait_dynamic_children(Child, ?SETS:del_element(Pid, Pids), Sz-1,
+ TRef, EStack);
+
+ {'DOWN', _MRef, process, Pid, Reason} ->
+ wait_dynamic_children(Child, ?SETS:del_element(Pid, Pids), Sz-1,
+ TRef, ?DICT:append(Reason, Pid, EStack))
+ end;
+wait_dynamic_children(#child{restart_type=RType} = Child, Pids, Sz,
+ TRef, EStack) ->
+ receive
+ {'DOWN', _MRef, process, Pid, shutdown} ->
+ wait_dynamic_children(Child, ?SETS:del_element(Pid, Pids), Sz-1,
+ TRef, EStack);
+
+ {'DOWN', _MRef, process, Pid, normal} when RType =/= permanent ->
+ wait_dynamic_children(Child, ?SETS:del_element(Pid, Pids), Sz-1,
+ TRef, EStack);
+
+ {'DOWN', _MRef, process, Pid, Reason} ->
+ wait_dynamic_children(Child, ?SETS:del_element(Pid, Pids), Sz-1,
+ TRef, ?DICT:append(Reason, Pid, EStack));
+
+ {timeout, TRef, kill} ->
+ ?SETS:fold(fun(P, _) -> exit(P, kill) end, ok, Pids),
+ wait_dynamic_children(Child, Pids, Sz-1, undefined, EStack)
+ end.
+
%%-----------------------------------------------------------------
%% Child/State manipulating functions.
%%-----------------------------------------------------------------
@@ -1134,12 +1238,19 @@ report_error(Error, Reason, Child, SupName) ->
error_logger:error_report(supervisor_report, ErrorMsg).
-extract_child(Child) ->
+extract_child(Child) when is_pid(Child#child.pid) ->
[{pid, Child#child.pid},
{name, Child#child.name},
{mfargs, Child#child.mfargs},
{restart_type, Child#child.restart_type},
{shutdown, Child#child.shutdown},
+ {child_type, Child#child.child_type}];
+extract_child(Child) ->
+ [{nb_children, length(Child#child.pid)},
+ {name, Child#child.name},
+ {mfargs, Child#child.mfargs},
+ {restart_type, Child#child.restart_type},
+ {shutdown, Child#child.shutdown},
{child_type, Child#child.child_type}].
report_progress(Child, SupName) ->