%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(erlang).
-export([apply/2,apply/3,spawn/4,spawn_link/4,
spawn_monitor/1,spawn_monitor/3,
spawn_opt/2,spawn_opt/3,spawn_opt/4,spawn_opt/5,
disconnect_node/1]).
-export([spawn/1, spawn_link/1, spawn/2, spawn_link/2]).
-export([yield/0]).
-export([crasher/6]).
-export([fun_info/1]).
-export([send_nosuspend/2, send_nosuspend/3]).
-export([localtime_to_universaltime/1]).
-export([suspend_process/1]).
-export([min/2, max/2]).
-export([dlink/1, dunlink/1, dsend/2, dsend/3, dgroup_leader/2,
dexit/2, dmonitor_node/3, dmonitor_p/2]).
-export([delay_trap/2]).
-export([set_cookie/2, get_cookie/0]).
-export([nodes/0]).
-export([concat_binary/1]).
-export([list_to_integer/2,integer_to_list/2]).
-export([flush_monitor_message/2]).
-export([set_cpu_topology/1, format_cpu_topology/1]).
-export([await_proc_exit/3]).
-deprecated([hash/2]).
-deprecated([concat_binary/1]).
-compile(nowarn_bif_clash).
%%--------------------------------------------------------------------------
-type date() :: {pos_integer(), pos_integer(), pos_integer()}.
-type time() :: {non_neg_integer(), non_neg_integer(), non_neg_integer()}.
-type date_time() :: {date(), time()}.
%%--------------------------------------------------------------------------
apply(Fun, Args) ->
erlang:apply(Fun, Args).
apply(Mod, Name, Args) ->
erlang:apply(Mod, Name, Args).
%% Spawns with a fun
spawn(F) when is_function(F) ->
spawn(erlang, apply, [F, []]);
spawn({M,F}=MF) when is_atom(M), is_atom(F) ->
spawn(erlang, apply, [MF, []]);
spawn(F) ->
erlang:error(badarg, [F]).
spawn(N, F) when N =:= node() ->
spawn(F);
spawn(N, F) when is_function(F) ->
spawn(N, erlang, apply, [F, []]);
spawn(N, {M,F}=MF) when is_atom(M), is_atom(F) ->
spawn(N, erlang, apply, [MF, []]);
spawn(N, F) ->
erlang:error(badarg, [N, F]).
spawn_link(F) when is_function(F) ->
spawn_link(erlang, apply, [F, []]);
spawn_link({M,F}=MF) when is_atom(M), is_atom(F) ->
spawn_link(erlang, apply, [MF, []]);
spawn_link(F) ->
erlang:error(badarg, [F]).
spawn_link(N, F) when N =:= node() ->
spawn_link(F);
spawn_link(N, F) when is_function(F) ->
spawn_link(N, erlang, apply, [F, []]);
spawn_link(N, {M,F}=MF) when is_atom(M), is_atom(F) ->
spawn_link(N, erlang, apply, [MF, []]);
spawn_link(N, F) ->
erlang:error(badarg, [N, F]).
%% Spawn and atomically set up a monitor.
spawn_monitor(F) when is_function(F, 0) ->
erlang:spawn_opt({erlang,apply,[F,[]],[monitor]});
spawn_monitor(F) ->
erlang:error(badarg, [F]).
spawn_monitor(M, F, A) when is_atom(M), is_atom(F), is_list(A) ->
erlang:spawn_opt({M,F,A,[monitor]});
spawn_monitor(M, F, A) ->
erlang:error(badarg, [M,F,A]).
spawn_opt(F, O) when is_function(F) ->
spawn_opt(erlang, apply, [F, []], O);
spawn_opt({M,F}=MF, O) when is_atom(M), is_atom(F) ->
spawn_opt(erlang, apply, [MF, []], O);
spawn_opt({M,F,A}, O) -> % For (undocumented) backward compatibility
spawn_opt(M, F, A, O);
spawn_opt(F, O) ->
erlang:error(badarg, [F, O]).
spawn_opt(N, F, O) when N =:= node() ->
spawn_opt(F, O);
spawn_opt(N, F, O) when is_function(F) ->
spawn_opt(N, erlang, apply, [F, []], O);
spawn_opt(N, {M,F}=MF, O) when is_atom(M), is_atom(F) ->
spawn_opt(N, erlang, apply, [MF, []], O);
spawn_opt(N, F, O) ->
erlang:error(badarg, [N, F, O]).
%% Spawns with MFA
spawn(N,M,F,A) when N =:= node(), is_atom(M), is_atom(F), is_list(A) ->
spawn(M,F,A);
spawn(N,M,F,A) when is_atom(N), is_atom(M), is_atom(F) ->
case is_well_formed_list(A) of
true ->
ok;
false ->
erlang:error(badarg, [N, M, F, A])
end,
case catch gen_server:call({net_kernel,N},
{spawn,M,F,A,group_leader()},
infinity) of
Pid when is_pid(Pid) ->
Pid;
Error ->
case remote_spawn_error(Error, {no_link, N, M, F, A, []}) of
{fault, Fault} ->
erlang:error(Fault, [N, M, F, A]);
Pid ->
Pid
end
end;
spawn(N,M,F,A) ->
erlang:error(badarg, [N, M, F, A]).
spawn_link(N,M,F,A) when N =:= node(), is_atom(M), is_atom(F), is_list(A) ->
spawn_link(M,F,A);
spawn_link(N,M,F,A) when is_atom(N), is_atom(M), is_atom(F) ->
case is_well_formed_list(A) of
true ->
ok;
_ ->
erlang:error(badarg, [N, M, F, A])
end,
case catch gen_server:call({net_kernel,N},
{spawn_link,M,F,A,group_leader()},
infinity) of
Pid when is_pid(Pid) ->
Pid;
Error ->
case remote_spawn_error(Error, {link, N, M, F, A, []}) of
{fault, Fault} ->
erlang:error(Fault, [N, M, F, A]);
Pid ->
Pid
end
end;
spawn_link(N,M,F,A) ->
erlang:error(badarg, [N, M, F, A]).
spawn_opt(M, F, A, Opts) ->
case catch erlang:spawn_opt({M,F,A,Opts}) of
{'EXIT',{Reason,_}} ->
erlang:error(Reason, [M,F,A,Opts]);
Res ->
Res
end.
spawn_opt(N, M, F, A, O) when N =:= node(),
is_atom(M), is_atom(F), is_list(A),
is_list(O) ->
spawn_opt(M, F, A, O);
spawn_opt(N, M, F, A, O) when is_atom(N), is_atom(M), is_atom(F) ->
case {is_well_formed_list(A), is_well_formed_list(O)} of
{true, true} ->
ok;
_ ->
erlang:error(badarg, [N, M, F, A, O])
end,
case lists:member(monitor, O) of
false -> ok;
true -> erlang:error(badarg, [N, M, F, A, O])
end,
{L,NO} = lists:foldl(fun (link, {_, NewOpts}) ->
{link, NewOpts};
(Opt, {LO, NewOpts}) ->
{LO, [Opt|NewOpts]}
end,
{no_link,[]},
O),
case catch gen_server:call({net_kernel,N},
{spawn_opt,M,F,A,NO,L,group_leader()},
infinity) of
Pid when is_pid(Pid) ->
Pid;
Error ->
case remote_spawn_error(Error, {L, N, M, F, A, NO}) of
{fault, Fault} ->
erlang:error(Fault, [N, M, F, A, O]);
Pid ->
Pid
end
end;
spawn_opt(N,M,F,A,O) ->
erlang:error(badarg, [N,M,F,A,O]).
remote_spawn_error({'EXIT', {{nodedown,N}, _}}, {L, N, M, F, A, O}) ->
{Opts, LL} = case L =:= link of
true ->
{[link|O], [link]};
false ->
{O, []}
end,
spawn_opt(erlang,crasher,[N,M,F,A,Opts,noconnection], LL);
remote_spawn_error({'EXIT', {Reason, _}}, _) ->
{fault, Reason};
remote_spawn_error({'EXIT', Reason}, _) ->
{fault, Reason};
remote_spawn_error(Other, _) ->
{fault, Other}.
is_well_formed_list([]) ->
true;
is_well_formed_list([_|Rest]) ->
is_well_formed_list(Rest);
is_well_formed_list(_) ->
false.
crasher(Node,Mod,Fun,Args,[],Reason) ->
error_logger:warning_msg("** Can not start ~w:~w,~w on ~w **~n",
[Mod,Fun,Args,Node]),
exit(Reason);
crasher(Node,Mod,Fun,Args,Opts,Reason) ->
error_logger:warning_msg("** Can not start ~w:~w,~w (~w) on ~w **~n",
[Mod,Fun,Args,Opts,Node]),
exit(Reason).
-spec yield() -> 'true'.
yield() ->
erlang:yield().
-spec nodes() -> [node()].
nodes() ->
erlang:nodes(visible).
-spec disconnect_node(node()) -> boolean().
disconnect_node(Node) ->
net_kernel:disconnect(Node).
fun_info(Fun) when is_function(Fun) ->
Keys = [type,env,arity,name,uniq,index,new_uniq,new_index,module,pid],
fun_info_1(Keys, Fun, []).
fun_info_1([K|Ks], Fun, A) ->
case erlang:fun_info(Fun, K) of
{K,undefined} -> fun_info_1(Ks, Fun, A);
{K,_}=P -> fun_info_1(Ks, Fun, [P|A])
end;
fun_info_1([], _, A) -> A.
-type dst() :: pid() | port() | atom() | {atom(), node()}.
-spec send_nosuspend(dst(), term()) -> boolean().
send_nosuspend(Pid, Msg) ->
send_nosuspend(Pid, Msg, []).
-spec send_nosuspend(dst(), term(), ['noconnect' | 'nosuspend']) -> boolean().
send_nosuspend(Pid, Msg, Opts) ->
case erlang:send(Pid, Msg, [nosuspend|Opts]) of
ok -> true;
_ -> false
end.
-spec localtime_to_universaltime(date_time()) -> date_time().
localtime_to_universaltime(Localtime) ->
erlang:localtime_to_universaltime(Localtime, undefined).
-spec suspend_process(pid()) -> 'true'.
suspend_process(P) ->
case catch erlang:suspend_process(P, []) of
{'EXIT', {Reason, _}} -> erlang:error(Reason, [P]);
{'EXIT', Reason} -> erlang:error(Reason, [P]);
Res -> Res
end.
%%
%% If the emulator wants to perform a distributed command and
%% a connection is not established to the actual node the following
%% functions are called in order to set up the connection and then
%% reactivate the command.
%%
-spec dlink(pid() | port()) -> 'true'.
dlink(Pid) ->
case net_kernel:connect(node(Pid)) of
true -> link(Pid);
false -> erlang:dist_exit(self(), noconnection, Pid), true
end.
%% Can this ever happen?
-spec dunlink(identifier()) -> 'true'.
dunlink(Pid) ->
case net_kernel:connect(node(Pid)) of
true -> unlink(Pid);
false -> true
end.
dmonitor_node(Node, Flag, []) ->
case net_kernel:connect(Node) of
true -> erlang:monitor_node(Node, Flag, []);
false -> self() ! {nodedown, Node}, true
end;
dmonitor_node(Node, Flag, Opts) ->
case lists:member(allow_passive_connect, Opts) of
true ->
case net_kernel:passive_cnct(Node) of
true -> erlang:monitor_node(Node, Flag, Opts);
false -> self() ! {nodedown, Node}, true
end;
_ ->
dmonitor_node(Node,Flag,[])
end.
dgroup_leader(Leader, Pid) ->
case net_kernel:connect(node(Pid)) of
true -> group_leader(Leader, Pid);
false -> true %% bad arg ?
end.
dexit(Pid, Reason) ->
case net_kernel:connect(node(Pid)) of
true -> exit(Pid, Reason);
false -> true
end.
dsend(Pid, Msg) when is_pid(Pid) ->
case net_kernel:connect(node(Pid)) of
true -> erlang:send(Pid, Msg);
false -> Msg
end;
dsend(Port, Msg) when is_port(Port) ->
case net_kernel:connect(node(Port)) of
true -> erlang:send(Port, Msg);
false -> Msg
end;
dsend({Name, Node}, Msg) ->
case net_kernel:connect(Node) of
true -> erlang:send({Name,Node}, Msg);
false -> Msg;
ignored -> Msg % Not distributed.
end.
dsend(Pid, Msg, Opts) when is_pid(Pid) ->
case net_kernel:connect(node(Pid)) of
true -> erlang:send(Pid, Msg, Opts);
false -> ok
end;
dsend(Port, Msg, Opts) when is_port(Port) ->
case net_kernel:connect(node(Port)) of
true -> erlang:send(Port, Msg, Opts);
false -> ok
end;
dsend({Name, Node}, Msg, Opts) ->
case net_kernel:connect(Node) of
true -> erlang:send({Name,Node}, Msg, Opts);
false -> ok;
ignored -> ok % Not distributed.
end.
-spec dmonitor_p('process', pid() | {atom(),atom()}) -> reference().
dmonitor_p(process, ProcSpec) ->
%% ProcSpec = pid() | {atom(),atom()}
%% ProcSpec CANNOT be an atom because a locally registered process
%% is never handled here.
Node = case ProcSpec of
{S,N} when is_atom(S), is_atom(N), N =/= node() -> N;
_ when is_pid(ProcSpec) -> node(ProcSpec)
end,
case net_kernel:connect(Node) of
true ->
erlang:monitor(process, ProcSpec);
false ->
Ref = make_ref(),
self() ! {'DOWN', Ref, process, ProcSpec, noconnection},
Ref
end.
%%
%% Trap function used when modified timing has been enabled.
%%
-spec delay_trap(Result, timeout()) -> Result.
delay_trap(Result, 0) -> erlang:yield(), Result;
delay_trap(Result, Timeout) -> receive after Timeout -> Result end.
%%
%% The business with different in and out cookies represented
%% everywhere is discarded.
%% A node has a cookie, connections/messages to that node use that cookie.
%% Messages to us use our cookie. IF we change our cookie, other nodes
%% have to reflect that, which we cannot forsee.
%%
set_cookie(Node, C) when Node =/= nonode@nohost, is_atom(Node) ->
Res = case C of
_ when is_atom(C) ->
auth:set_cookie(Node, C);
{CI,CO} when is_atom(CI), is_atom(CO) ->
auth:set_cookie(Node, {CI, CO});
_ ->
error
end,
case Res of
error -> exit(badarg);
Other -> Other
end.
-spec get_cookie() -> atom().
get_cookie() ->
auth:get_cookie().
concat_binary(List) ->
list_to_binary(List).
-spec integer_to_list(integer(), 1..255) -> string().
integer_to_list(I, 10) ->
erlang:integer_to_list(I);
integer_to_list(I, Base)
when is_integer(I), is_integer(Base), Base >= 2, Base =< 1+$Z-$A+10 ->
if I < 0 ->
[$-|integer_to_list(-I, Base, [])];
true ->
integer_to_list(I, Base, [])
end;
integer_to_list(I, Base) ->
erlang:error(badarg, [I, Base]).
integer_to_list(I0, Base, R0) ->
D = I0 rem Base,
I1 = I0 div Base,
R1 = if D >= 10 ->
[D-10+$A|R0];
true ->
[D+$0|R0]
end,
if I1 =:= 0 ->
R1;
true ->
integer_to_list(I1, Base, R1)
end.
list_to_integer(L, 10) ->
erlang:list_to_integer(L);
list_to_integer(L, Base)
when is_list(L), is_integer(Base), Base >= 2, Base =< 1+$Z-$A+10 ->
case list_to_integer_sign(L, Base) of
I when is_integer(I) ->
I;
Fault ->
erlang:error(Fault, [L,Base])
end;
list_to_integer(L, Base) ->
erlang:error(badarg, [L,Base]).
list_to_integer_sign([$-|[_|_]=L], Base) ->
case list_to_integer(L, Base, 0) of
I when is_integer(I) ->
-I;
I ->
I
end;
list_to_integer_sign([$+|[_|_]=L], Base) ->
list_to_integer(L, Base, 0);
list_to_integer_sign([_|_]=L, Base) ->
list_to_integer(L, Base, 0);
list_to_integer_sign(_, _) ->
badarg.
list_to_integer([D|L], Base, I)
when is_integer(D), D >= $0, D =< $9, D < Base+$0 ->
list_to_integer(L, Base, I*Base + D-$0);
list_to_integer([D|L], Base, I)
when is_integer(D), D >= $A, D < Base+$A-10 ->
list_to_integer(L, Base, I*Base + D-$A+10);
list_to_integer([D|L], Base, I)
when is_integer(D), D >= $a, D < Base+$a-10 ->
list_to_integer(L, Base, I*Base + D-$a+10);
list_to_integer([], _, I) ->
I;
list_to_integer(_, _, _) ->
badarg.
%% erlang:flush_monitor_message/2 is for internal use only!
%%
%% erlang:demonitor(Ref, [flush]) traps to
%% erlang:flush_monitor_message(Ref, Res) when
%% it needs to flush a monitor message.
flush_monitor_message(Ref, Res) when is_reference(Ref), is_atom(Res) ->
receive {_, Ref, _, _, _} -> ok after 0 -> ok end,
Res.
-record(cpu, {node = -1,
processor = -1,
processor_node = -1,
core = -1,
thread = -1,
logical = -1}).
%% erlang:set_cpu_topology/1 is for internal use only!
%%
%% erlang:system_flag(cpu_topology, CpuTopology) traps to
%% erlang:set_cpu_topology(CpuTopology).
set_cpu_topology(CpuTopology) ->
try format_cpu_topology(erlang:system_flag(internal_cpu_topology,
cput_e2i(CpuTopology)))
catch
Class:Exception when Class =/= error; Exception =/= internal_error ->
erlang:error(badarg, [CpuTopology])
end.
cput_e2i_clvl({logical, _}, _PLvl) ->
#cpu.logical;
cput_e2i_clvl([E | _], PLvl) ->
case element(1, E) of
node -> case PLvl of
0 -> #cpu.node;
#cpu.processor -> #cpu.processor_node
end;
processor -> case PLvl of
0 -> #cpu.node;
#cpu.node -> #cpu.processor
end;
core -> #cpu.core;
thread -> #cpu.thread
end.
cput_e2i(undefined) ->
undefined;
cput_e2i(E) ->
rvrs(cput_e2i(E, -1, -1, #cpu{}, 0, cput_e2i_clvl(E, 0), [])).
cput_e2i([], _NId, _PId, _IS, _PLvl, _Lvl, Res) ->
Res;
cput_e2i([E|Es], NId0, PId, IS, PLvl, Lvl, Res0) ->
case cput_e2i(E, NId0, PId, IS, PLvl, Lvl, Res0) of
[] ->
cput_e2i(Es, NId0, PId, IS, PLvl, Lvl, Res0);
[#cpu{node = N,
processor = P,
processor_node = PN} = CPU|_] = Res1 ->
NId1 = case N > PN of
true -> N;
false -> PN
end,
cput_e2i(Es, NId1, P, CPU, PLvl, Lvl, Res1)
end;
cput_e2i({Tag, [], TagList}, Nid, PId, CPU, PLvl, Lvl, Res) ->
%% Currently [] is the only valid InfoList
cput_e2i({Tag, TagList}, Nid, PId, CPU, PLvl, Lvl, Res);
cput_e2i({node, NL}, Nid0, PId, _CPU, 0, #cpu.node, Res) ->
Nid1 = Nid0+1,
Lvl = cput_e2i_clvl(NL, #cpu.node),
cput_e2i(NL, Nid1, PId, #cpu{node = Nid1}, #cpu.node, Lvl, Res);
cput_e2i({processor, PL}, Nid, PId0, _CPU, 0, #cpu.node, Res) ->
PId1 = PId0+1,
Lvl = cput_e2i_clvl(PL, #cpu.processor),
cput_e2i(PL, Nid, PId1, #cpu{processor = PId1}, #cpu.processor, Lvl, Res);
cput_e2i({processor, PL}, Nid, PId0, CPU, PLvl, CLvl, Res)
when PLvl < #cpu.processor, CLvl =< #cpu.processor ->
PId1 = PId0+1,
Lvl = cput_e2i_clvl(PL, #cpu.processor),
cput_e2i(PL, Nid, PId1, CPU#cpu{processor = PId1,
processor_node = -1,
core = -1,
thread = -1}, #cpu.processor, Lvl, Res);
cput_e2i({node, NL}, Nid0, PId, CPU, #cpu.processor, #cpu.processor_node,
Res) ->
Nid1 = Nid0+1,
Lvl = cput_e2i_clvl(NL, #cpu.processor_node),
cput_e2i(NL, Nid1, PId, CPU#cpu{processor_node = Nid1},
#cpu.processor_node, Lvl, Res);
cput_e2i({core, CL}, Nid, PId, #cpu{core = C0} = CPU, PLvl, #cpu.core, Res)
when PLvl < #cpu.core ->
Lvl = cput_e2i_clvl(CL, #cpu.core),
cput_e2i(CL, Nid, PId, CPU#cpu{core = C0+1, thread = -1}, #cpu.core, Lvl,
Res);
cput_e2i({thread, TL}, Nid, PId, #cpu{thread = T0} = CPU, PLvl, #cpu.thread,
Res) when PLvl < #cpu.thread ->
Lvl = cput_e2i_clvl(TL, #cpu.thread),
cput_e2i(TL, Nid, PId, CPU#cpu{thread = T0+1}, #cpu.thread, Lvl, Res);
cput_e2i({logical, ID}, _Nid, PId, #cpu{processor=P, core=C, thread=T} = CPU,
PLvl, #cpu.logical, Res)
when PLvl < #cpu.logical, is_integer(ID), 0 =< ID, ID < 65536 ->
[CPU#cpu{processor = case P of -1 -> PId+1; _ -> P end,
core = case C of -1 -> 0; _ -> C end,
thread = case T of -1 -> 0; _ -> T end,
logical = ID} | Res].
%% erlang:format_cpu_topology/1 is for internal use only!
%%
%% erlang:system_info(cpu_topology),
%% and erlang:system_info({cpu_topology, Which}) traps to
%% erlang:format_cpu_topology(InternalCpuTopology).
format_cpu_topology(InternalCpuTopology) ->
try cput_i2e(InternalCpuTopology)
catch _ : _ -> erlang:error(internal_error, [InternalCpuTopology])
end.
cput_i2e(undefined) -> undefined;
cput_i2e(Is) -> cput_i2e(Is, true, #cpu.node, cput_i2e_tag_map()).
cput_i2e([], _Frst, _Lvl, _TM) ->
[];
cput_i2e([#cpu{logical = LID}| _], _Frst, Lvl, _TM) when Lvl == #cpu.logical ->
{logical, LID};
cput_i2e([#cpu{} = I | Is], Frst, Lvl, TM) ->
cput_i2e(element(Lvl, I), Frst, Is, [I], Lvl, TM).
cput_i2e(V, Frst, [I | Is], SameV, Lvl, TM) when V =:= element(Lvl, I) ->
cput_i2e(V, Frst, Is, [I | SameV], Lvl, TM);
cput_i2e(-1, true, [], SameV, Lvl, TM) ->
cput_i2e(rvrs(SameV), true, Lvl+1, TM);
cput_i2e(_V, true, [], SameV, Lvl, TM) when Lvl =/= #cpu.processor,
Lvl =/= #cpu.processor_node ->
cput_i2e(rvrs(SameV), true, Lvl+1, TM);
cput_i2e(-1, _Frst, Is, SameV, #cpu.node, TM) ->
cput_i2e(rvrs(SameV), true, #cpu.processor, TM)
++ cput_i2e(Is, false, #cpu.node, TM);
cput_i2e(_V, _Frst, Is, SameV, Lvl, TM) ->
[{cput_i2e_tag(Lvl, TM), cput_i2e(rvrs(SameV), true, Lvl+1, TM)}
| cput_i2e(Is, false, Lvl, TM)].
cput_i2e_tag_map() -> list_to_tuple([cpu | record_info(fields, cpu)]).
cput_i2e_tag(Lvl, TM) ->
case element(Lvl, TM) of processor_node -> node; Other -> Other end.
rvrs([_] = L) -> L;
rvrs(Xs) -> rvrs(Xs, []).
rvrs([],Ys) -> Ys;
rvrs([X|Xs],Ys) -> rvrs(Xs, [X|Ys]).
%% erlang:await_proc_exit/3 is for internal use only!
%%
%% BIFs that need to await a specific process exit before
%% returning traps to erlang:await_proc_exit/3.
%%
%% NOTE: This function is tightly coupled to
%% the implementation of the
%% erts_bif_prep_await_proc_exit_*()
%% functions in bif.c. Do not make
%% any changes to it without reading
%% the comment about them in bif.c!
-spec await_proc_exit(dst(), 'apply' | 'data' | 'reason', term()) -> term().
await_proc_exit(Proc, Op, Data) ->
Mon = erlang:monitor(process, Proc),
receive
{'DOWN', Mon, process, _Proc, Reason} ->
case Op of
apply ->
{M, F, A} = Data,
erlang:apply(M, F, A);
data ->
Data;
reason ->
Reason
end
end.
-spec min(term(), term()) -> term().
min(A, B) when A > B -> B;
min(A, _) -> A.
-spec max(term(), term()) -> term().
max(A, B) when A < B -> B;
max(A, _) -> A.
