%% %% %CopyrightBegin% %% %% Copyright Ericsson AB 2002-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. %% You may obtain a copy of the License at %% %% http://www.apache.org/licenses/LICENSE-2.0 %% %% Unless required by applicable law or agreed to in writing, software %% distributed under the License is distributed on an "AS IS" BASIS, %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %% See the License for the specific language governing permissions and %% limitations under the License. %% %% %CopyrightEnd% %% %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% %%% Define to run outside of test server %%% %%% -define(STANDALONE,1). %%% %%% %%% Define for debug output %%% %%% -define(debug,1). -module(trace_meta_SUITE). %% Exported end user tests -export([basic_test/0, return_test/0, on_and_off_test/0, stack_grow_test/0, info_test/0, tracer_test/0, combo_test/0, nosilent_test/0]). %% Internal exports -export([exported/1, exported_wrap/1, loop/4, id/1, receiver/1]). %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Test server related stuff %% -ifdef(STANDALONE). -define(config(A,B),config(A,B)). -export([config/2]). -else. -include_lib("common_test/include/ct.hrl"). -endif. -ifdef(debug). -ifdef(STANDALONE). -define(line, erlang:display({?MODULE,?LINE}), ). -endif. -define(dbgformat(A,B),io:format(A,B)). -else. -ifdef(STANDALONE). -define(line, noop, ). -endif. -define(dbgformat(A,B),noop). -endif. -ifdef(STANDALONE). config(priv_dir,_) -> ".". -else. %% When run in test server. -export([all/0, suite/0, init_per_testcase/2, end_per_testcase/2, not_run/1]). -export([basic/1, return/1, on_and_off/1, stack_grow/1, info/1, tracer/1, combo/1, nosilent/1]). init_per_testcase(_Case, Config) -> Config. end_per_testcase(_Case, _Config) -> shutdown(), ok. suite() -> [{ct_hooks,[ts_install_cth]}, {timetrap, {minutes, 5}}]. all() -> case test_server:is_native(trace_meta_SUITE) of true -> [not_run]; false -> [basic, return, on_and_off, stack_grow, info, tracer, combo, nosilent] end. not_run(Config) when is_list(Config) -> {skipped,"Native code"}. %% Tests basic meta trace basic(Config) when is_list(Config) -> basic_test(). %% Tests return trace return(Config) when is_list(Config) -> return_test(). %% Tests turning trace parameters on and off on_and_off(Config) when is_list(Config) -> on_and_off_test(). %% Tests the stack growth during return traces stack_grow(Config) when is_list(Config) -> stack_grow_test(). %% Tests the trace_info BIF info(Config) when is_list(Config) -> info_test(). %% Tests stopping and changing tracer process tracer(Config) when is_list(Config) -> tracer_test(). %% Tests combining local call trace with meta trace combo(Config) when is_list(Config) -> combo_test(). %% Tests that meta trace is not silenced by the silent process flag nosilent(Config) when is_list(Config) -> nosilent_test(). -endif. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Result examination macros -define(CT(P,MFA),{trace,P,call,MFA}). -define(CTT(P, MFA),{trace_ts,P,call,MFA,{_,_,_}}). -define(RF(P,MFA,V),{trace,P,return_from,MFA,V}). -define(RFT(P,MFA,V),{trace_ts,P,return_from,MFA,V,{_,_,_}}). -define(RT(P,MFA),{trace,P,return_to,MFA}). -define(RTT(P,MFA),{trace_ts,P,return_to,MFA,{_,_,_}}). -define(NM, receive_no_next(100)). %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% The Tests %%% basic_test() -> Pid = setup(), erlang:trace_pattern({?MODULE,'_','_'},[],[meta]), [1,1,1,0] = apply_slave(?MODULE,exported_wrap,[1]), ?CTT(Pid,{?MODULE,exported_wrap,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,exported,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local2,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local_tail,[1]}) = receive_next(), erlang:trace_pattern({?MODULE,'_','_'},false,[meta]), [1,1,1,0] = apply_slave(?MODULE,exported_wrap,[1]), ?NM, [1,1,1,0] = lambda_slave(fun() -> exported_wrap(1) end), ?NM, erlang:trace_pattern({?MODULE,'_','_'},[],[meta]), [1,1,1,0] = lambda_slave(fun() -> exported_wrap(1) end), ?CTT(Pid,{?MODULE,_,_}) = receive_next(), %% The fun ?CTT(Pid,{?MODULE,exported_wrap,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,exported,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local2,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local_tail,[1]}) = receive_next(), erlang:trace_pattern({?MODULE,'_','_'},false,[meta]), shutdown(), ?NM, ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% return_test() -> Pid = setup(), erlang:trace_pattern({?MODULE,'_','_'},[{'_',[],[{return_trace}]}], [meta]), erlang:trace_pattern({erlang,phash2,'_'},[{'_',[],[{return_trace}]}], [meta]), [1,1,1,0] = apply_slave(?MODULE,exported_wrap,[1]), ?CTT(Pid,{?MODULE,exported_wrap,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,exported,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local2,[1]}) = receive_next(), ?CTT(Pid,{?MODULE,local_tail,[1]}) = receive_next(), ?CTT(Pid,{erlang,phash2,[1,1]}) = receive_next(), ?RFT(Pid,{erlang,phash2,2},0) = receive_next(), ?RFT(Pid,{?MODULE,local_tail,1},[1,0]) = receive_next(), ?RFT(Pid,{?MODULE,local2,1},[1,0]) = receive_next(), ?RFT(Pid,{?MODULE,local,1},[1,1,0]) = receive_next(), ?RFT(Pid,{?MODULE,exported,1},[1,1,1,0]) = receive_next(), ?RFT(Pid,{?MODULE,exported_wrap,1},[1,1,1,0]) = receive_next(), shutdown(), ?NM, ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% on_and_off_test() -> Pid = setup(), 1 = erlang:trace_pattern({?MODULE,local_tail,1},[],[meta]), LocalTail = fun() -> local_tail(1) end, [1,0] = lambda_slave(LocalTail), ?CTT(Pid,{?MODULE,local_tail,[1]}) = receive_next(), 0 = erlang:trace_pattern({?MODULE,local_tail,1},[],[global]), [1,0] = lambda_slave(LocalTail), ?NM, 1 = erlang:trace_pattern({?MODULE,exported_wrap,1},[],[meta]), [1,1,1,0] = apply_slave(?MODULE,exported_wrap,[1]), ?CTT(Pid,{?MODULE,exported_wrap,[1]}) = receive_next(), 1 = erlang:trace_pattern({erlang,phash2,2},[],[meta]), [1,1,1,0] = apply_slave(?MODULE,exported_wrap,[1]), ?CTT(Pid,{?MODULE,exported_wrap,[1]}) = receive_next(), ?CTT(Pid,{erlang,phash2,[1,1]}) = receive_next(), shutdown(), erlang:trace_pattern({'_','_','_'},false,[meta]), N = erlang:trace_pattern({erlang,'_','_'},true,[meta]), case erlang:trace_pattern({erlang,'_','_'},false,[meta]) of N -> ok; Else -> exit({number_mismatch, {expected, N}, {got, Else}}) end, case erlang:trace_pattern({erlang,'_','_'},false,[meta]) of N -> ok; Else2 -> exit({number_mismatch, {expected, N}, {got, Else2}}) end, %% ?NM, %% Can't check for erlang:*/* stuff since common_test or test_server %% will likely call list_to_binary in the logger. just drain any potential %% message ok = flush(), ok. flush() -> receive _ -> flush() after 0 -> ok end. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% stack_grow_test() -> Pid = setup(), 1 = erlang:trace_pattern({?MODULE,loop,4}, [{'_',[],[{return_trace}]}],[meta]), Num = 1 bsl 15, Surface = fun (This, ?RFT(P,{?MODULE,loop,4},N), N) when P == Pid-> if N == Num -> ?NM, ok; true -> This(This, receive_next(), N+1) end end, Dive = fun (This, ?CTT(P,{?MODULE,loop,[{hej,hopp},[a,b,c],4.5,N]}), N) when P == Pid-> if N == 0 -> Surface(Surface, receive_next(), 0); true -> This(This, receive_next(), N-1) end end, apply_slave(?MODULE,loop,[{hej,hopp},[a,b,c],4.5,Num]), % apply_slave_async(?MODULE,loop,[{hej,hopp},[a,b,c],4.5,Num]), % List = collect(test_server:seconds(5)), ok = Dive(Dive, receive_next(), Num), ?NM, ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% info_test() -> setup(), Prog = [{['$1'],[{is_integer,'$1'}],[{message, false}]}, {'_',[],[]}], Self = self(), GoOn = make_ref(), Pid = spawn_link( fun () -> erlang:trace_pattern({?MODULE,exported_wrap,1}, Prog, [{meta, Self}]), Self ! {self(), GoOn} end), receive {Pid, GoOn} -> ok end, {traced,false} = erlang:trace_info({?MODULE,exported_wrap,1}, traced), {match_spec, false} = erlang:trace_info({?MODULE,exported_wrap,1}, match_spec), {meta, Self} = erlang:trace_info({?MODULE,exported_wrap,1}, meta), {meta_match_spec, MMS} = erlang:trace_info({?MODULE,exported_wrap,1}, meta_match_spec), case MMS of Prog -> ok; Wrong -> exit({bad_result, {erlang,trace_info, [{?MODULE,exported_wrap,1}, meta_match_spec]}, {expected, Prog}, {got, Wrong}}) end, erlang:garbage_collect(self()), receive after 1 -> ok end, io:format("~p~n",[MMS]), {meta_match_spec,MMS2} = erlang:trace_info({?MODULE,exported_wrap,1}, meta_match_spec), io:format("~p~n",[MMS2]), case MMS2 of Prog -> ok; Wrong2 -> exit({bad_result, {erlang,trace_info, [{?MODULE,exported_wrap,1}, meta_match_spec]}, {expected, Prog}, {got, Wrong2}}) end, {all, [_|_]=L} = erlang:trace_info({?MODULE,exported_wrap,1}, all), {value, {meta, Self}} = lists:keysearch(meta, 1, L), {value, {meta_match_spec, MMS}} = lists:keysearch(meta_match_spec, 1, L), erlang:trace_pattern({?MODULE,exported_wrap,1}, true, [meta]), {meta_match_spec, []} = erlang:trace_info({?MODULE,exported_wrap,1}, meta_match_spec), erlang:trace_pattern({?MODULE,exported_wrap,1}, false, [meta]), {meta, false} = erlang:trace_info({?MODULE,exported_wrap,1}, meta), {meta_match_spec, false} = erlang:trace_info({?MODULE,exported_wrap,1}, meta_match_spec), {all, false} = erlang:trace_info({?MODULE,exported_wrap,1}, all), shutdown(), ?NM, ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% tracer_test() -> Slave = setup(), Self = self(), MatchSpec = [{'_',[],[{return_trace}]}], Tracer1 = spawn_link(fun () -> relay_n(3, Self) end), Setter = spawn_link( fun () -> erlang:trace_pattern({?MODULE,receiver,1}, MatchSpec, [{meta,Tracer1}]), erlang:trace_pattern({erlang,phash2,2}, MatchSpec, [{meta,Tracer1}]), Self ! {self(), done} end), receive {Setter, done} -> ok end, Ref = make_ref(), apply_slave_async(?MODULE, receiver, [Ref]), {Tracer1,?CTT(Slave,{?MODULE,receiver,[Ref]})} = receive_next(100), {Tracer1,?CTT(Slave,{erlang,phash2,[1,1]})} = receive_next(100), {Tracer1,?RFT(Slave,{erlang,phash2,2},0)} = receive_next(100), %% Initiate a return_trace that will fail since the tracer just stopped Slave ! Ref, receive_no_next(100), %% The breakpoint has not been hit since the tracer stopped {meta,Tracer1} = erlang:trace_info({?MODULE,receiver,1}, meta), {meta_match_spec, MatchSpec} = erlang:trace_info({?MODULE,receiver,1}, meta_match_spec), {meta,Tracer1} = erlang:trace_info({erlang,phash2,2}, meta), {meta_match_spec, MatchSpec} = erlang:trace_info({erlang,phash2,2}, meta_match_spec), %% Initiate trace messages that will fail Ref2 = make_ref(), apply_slave_async(?MODULE, receiver, [Ref2]), Slave ! Ref2, receive_no_next(100), {meta,[]} = erlang:trace_info({?MODULE,receiver,1}, meta), {meta_match_spec, MatchSpec} = erlang:trace_info({?MODULE,receiver,1}, meta_match_spec), {meta,[]} = erlang:trace_info({erlang,phash2,2}, meta), {meta_match_spec, MatchSpec} = erlang:trace_info({erlang,phash2,2}, meta_match_spec), %% Change tracer Tracer2 = spawn_link(fun () -> relay_n(4, Self) end), erlang:trace_pattern({?MODULE,receiver,1}, MatchSpec, [{meta,Tracer2}]), erlang:trace_pattern({erlang,phash2,2}, MatchSpec, [{meta,Tracer2}]), Ref3 = make_ref(), apply_slave_async(?MODULE, receiver, [Ref3]), {Tracer2,?CTT(Slave,{?MODULE,receiver,[Ref3]})} = receive_next(), {Tracer2,?CTT(Slave,{erlang,phash2,[1,1]})} = receive_next(), {Tracer2,?RFT(Slave,{erlang,phash2,2},0)} = receive_next(), %% Change tracer between call trace and return trace Tracer3 = spawn_link(fun () -> relay_n(4, Self) end), erlang:trace_pattern({?MODULE,receiver,1}, MatchSpec, [{meta,Tracer3}]), erlang:trace_pattern({erlang,phash2,2}, MatchSpec, [{meta,Tracer3}]), Slave ! Ref3, %% The return trace should still come from Tracer2 {Tracer2,?RFT(Slave,{?MODULE,receiver,1},Ref3)} = receive_next(), Ref4 = make_ref(), %% Now should Tracer3 be used apply_slave_async(?MODULE, receiver, [Ref4]), Slave ! Ref4, {Tracer3,?CTT(Slave,{?MODULE,receiver,[Ref4]})} = receive_next(), {Tracer3,?CTT(Slave,{erlang,phash2,[1,1]})} = receive_next(), {Tracer3,?RFT(Slave,{erlang,phash2,2},0)} = receive_next(), {Tracer3,?RFT(Slave,{?MODULE,receiver,1},Ref4)} = receive_next(), %% The breakpoint has not been hit since the tracer stopped {meta,Tracer3} = erlang:trace_info({?MODULE,receiver,1}, meta), {meta_match_spec, MatchSpec} = erlang:trace_info({?MODULE,receiver,1}, meta_match_spec), {meta,Tracer3} = erlang:trace_info({erlang,phash2,2}, meta), {meta_match_spec, MatchSpec} = erlang:trace_info({erlang,phash2,2}, meta_match_spec), shutdown(), ?NM, ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% combo_test() -> Slave = setup(), Self = self(), MatchSpec = [{'_',[],[{return_trace}]}], Flags = lists:sort([call, return_to]), LocalTracer = spawn_link(fun () -> relay_n(6, Self) end), MetaTracer = spawn_link(fun () -> relay_n(4, Self) end), 1 = erlang:trace_pattern({?MODULE,receiver,1}, MatchSpec, [local,{meta,MetaTracer}]), 1 = erlang:trace_pattern({erlang,phash2,2}, MatchSpec, [local,{meta,MetaTracer}]), 1 = erlang:trace(Slave, true, [{tracer,LocalTracer} | Flags]), %% {all, TraceInfo1} = erlang:trace_info({?MODULE,receiver,1}, all), {meta,MetaTracer} = erlang:trace_info({?MODULE,receiver,1}, meta), {value,{meta,MetaTracer}} = lists:keysearch(meta, 1, TraceInfo1), {meta_match_spec,MatchSpec} = erlang:trace_info({?MODULE,receiver,1}, meta_match_spec), {value,{meta_match_spec,MatchSpec}} = lists:keysearch(meta_match_spec, 1, TraceInfo1), {traced,local} = erlang:trace_info({?MODULE,receiver,1}, traced), {value,{traced,local}} = lists:keysearch(traced, 1, TraceInfo1), {match_spec,MatchSpec} = erlang:trace_info({?MODULE,receiver,1}, match_spec), {value,{match_spec,MatchSpec}} = lists:keysearch(match_spec, 1, TraceInfo1), %% {all, TraceInfo2} = erlang:trace_info({erlang,phash2,2}, all), {meta,MetaTracer} = erlang:trace_info({erlang,phash2,2}, meta), {value,{meta,MetaTracer}} = lists:keysearch(meta, 1, TraceInfo2), {meta_match_spec,MatchSpec} = erlang:trace_info({erlang,phash2,2}, meta_match_spec), {value,{meta_match_spec,MatchSpec}} = lists:keysearch(meta_match_spec, 1, TraceInfo2), {traced,local} = erlang:trace_info({erlang,phash2,2}, traced), {value,{traced,local}} = lists:keysearch(traced, 1, TraceInfo2), {match_spec,MatchSpec} = erlang:trace_info({erlang,phash2,2}, match_spec), {value,{match_spec,MatchSpec}} = lists:keysearch(match_spec, 1, TraceInfo2), %% {flags,Flags1} = erlang:trace_info(Slave, flags), Flags = lists:sort(Flags1), {tracer,LocalTracer} = erlang:trace_info(Slave, tracer), %% Ref = make_ref(), apply_slave_async(?MODULE, receiver, [Ref]), Slave ! Ref, ?CTT(Slave,{?MODULE,receiver,[Ref]}) = receive_next_bytag(MetaTracer), ?CTT(Slave,{erlang,phash2,[1,1]}) = receive_next_bytag(MetaTracer), ?RFT(Slave,{erlang,phash2,2},0) = receive_next_bytag(MetaTracer), ?RFT(Slave,{?MODULE,receiver,1},Ref) = receive_next_bytag(MetaTracer), ?CT(Slave,{?MODULE,receiver,[Ref]}) = receive_next_bytag(LocalTracer), ?CT(Slave,{erlang,phash2,[1,1]}) = receive_next_bytag(LocalTracer), case {receive_next_bytag(LocalTracer), receive_next_bytag(LocalTracer)} of {?RF(Slave,{erlang,phash2,2},0), ?RT(Slave,{?MODULE,receiver,1})} -> ok; {?RT(Slave,{?MODULE,receiver,1}), ?RF(Slave,{erlang,phash2,2},0)} -> ok; Error1 -> ct:fail({unexpected_message, Error1}) end, case {receive_next_bytag(LocalTracer), receive_next_bytag(LocalTracer)} of {?RF(Slave,{?MODULE,receiver,1},Ref), ?RT(Slave,{?MODULE,slave,1})} -> ok; {?RT(Slave,{?MODULE,slave,1}), ?RF(Slave,{?MODULE,receiver,1},Ref)} -> ok; Error2 -> ct:fail({unexpected_message, Error2}) end, shutdown(), ?NM, ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Use case for Inviso meta tracing: %% Setup silent local call tracing, and start it using meta trace. nosilent_test() -> Pid = setup(), Trigger = {?MODULE,id,1}, TriggerMS = [{[start],[],[{silent,false}]}, {[stop],[],[{silent,true},{return_trace}]}], 1 = erlang:trace(Pid, true, [call,silent,return_to]), erlang:trace_pattern({?MODULE,'_','_'},[],[local]), 1 = erlang:trace_pattern({?MODULE,local2,1}, [{'_',[],[{return_trace}]}], [local]), 1 = erlang:trace_pattern({?MODULE,slave,1},false,[local]), 1 = erlang:trace_pattern(Trigger,false,[local]), 1 = erlang:trace_pattern(Trigger,TriggerMS,[meta]), [1,1,1,0] = apply_slave(?MODULE,exported_wrap,[1]), receive_no_next(17), start = apply_slave(?MODULE, id, [start]), ?CTT(Pid,{?MODULE,id,[start]}) = receive_next(), [2,2,2,0] = apply_slave(?MODULE,exported_wrap,[2]), ?CT(Pid,{?MODULE,exported_wrap,[2]}) = receive_next(), ?CT(Pid,{?MODULE,exported,[2]}) = receive_next(), ?CT(Pid,{?MODULE,local,[2]}) = receive_next(), ?CT(Pid,{?MODULE,local2,[2]}) = receive_next(), ?CT(Pid,{?MODULE,local_tail,[2]}) = receive_next(), ?RF(Pid,{?MODULE,local2,1}, [2,0]) = receive_next(), ?RT(Pid,{?MODULE,local,1}) = receive_next(), ?RT(Pid,{?MODULE,exported,1}) = receive_next(), ?RT(Pid,{?MODULE,slave,1}) = receive_next(), stop = apply_slave(?MODULE, id, [stop]), ?CTT(Pid,{?MODULE,id,[stop]}) = receive_next(), ?RFT(Pid,{?MODULE,id,1}, stop) = receive_next(), [3,3,3,0] = apply_slave(?MODULE,exported_wrap,[3]), receive_no_next(17), shutdown(), ok. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Trace target functions loop(D1,D2,D3,0) -> io:format("~p~n",[[D1,D2,D3]]), 0; loop(D1,D2,D3,N) -> max(N,loop(D1,D2,D3,N-1)). id(X) -> X. exported_wrap(Val) -> exported(Val). exported(Val) -> [Val | local(Val)]. %% Non tail recursive local call local(Val) -> [Val | local2(Val)]. %% Non tail recursive local call local2(Val) -> local_tail(Val). %% Tail recursive call local_tail(Val) -> [Val , erlang:phash2(1,1)]. receiver(Msg) -> erlang:phash2(1,1), receive Msg -> Msg end. %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Trace target process and utilities slave(Sync) -> Sync ! sync, receive {From,apply, M, F, A} -> ?dbgformat("Apply: ~p:~p/~p (~p)~n",[M,F,length(A),A]), Res = apply(M,F,A), ?dbgformat("done Apply: ~p:~p/~p (~p)~n",[M,F,length(A),A]), From ! {apply, Res}, erlang:trace_pattern({?MODULE,slave,1},false,[meta]), slave(From); {From, lambda, Fun} -> Res = Fun(), From ! {lambda, Res}, erlang:trace_pattern({?MODULE,slave,1},false,[meta]), slave(From); die -> exit(normal) end. setup() -> trace_off(), Self = self(), Pid = spawn(fun () -> slave(Self) end), receive sync -> ok end, put(slave,Pid), Pid. shutdown() -> trace_off(), Pid = get(slave), case (catch is_process_alive(Pid)) of true -> Ref = erlang:monitor(process,Pid), Pid ! die, receive {'DOWN',Ref,process,Pid,_} -> ok end; _ -> ok end. trace_off() -> erlang:trace(all, false, [all]), erlang:trace_pattern({'_','_','_'},false,[]), erlang:trace_pattern({'_','_','_'},false,[local]), erlang:trace_pattern({'_','_','_'},false,[meta]), erlang:trace_pattern(on_load,false,[]), erlang:trace_pattern(on_load,false,[local]), erlang:trace_pattern(on_load,false,[meta]), ok. apply_slave_async(M,F,A) -> Slave = get(slave), Pid = spawn( fun () -> Slave ! {self(),apply, M, F, A}, receive {apply, _} -> receive sync -> ok end end end), Pid. apply_slave(M,F,A) -> Pid = get(slave), Pid ! {self(),apply, M, F, A}, receive {apply, Res} -> receive sync -> Res end end. lambda_slave(Fun) -> Pid = get(slave), Pid ! {self(), lambda, Fun}, receive {lambda, Res} -> receive sync -> Res end end. relay_n(0, _) -> ok; relay_n(N, Dest) -> receive Msg -> Dest ! {self(), Msg}, relay_n(N-1, Dest) end. receive_next() -> receive_next(infinity). receive_next(TO) -> receive M -> M after TO -> ct:fail(timeout) end. receive_no_next(TO) -> receive M -> ct:fail({unexpected_message, M}) after TO -> ok end. receive_next_bytag(Tag) -> receive_next_bytag(Tag, infinity). receive_next_bytag(Tag, TO) -> receive {Tag, Msg} -> Msg after TO -> timeout end.