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-module(ipc_tree).
-export([go/1, init/2]).
go(N) ->
start(N, self()),
receive {_,stop} -> ok end.
start(Depth, ParentPid) ->
spawn(?MODULE, init, [Depth, ParentPid]).
init(0, ParentPid) ->
workload(5000),
ParentPid ! {self(),stop},
ok;
init(Depth, ParentPid) ->
Pid1 = spawn(?MODULE, init, [Depth - 1, self()]),
Pid2 = spawn(?MODULE, init, [Depth - 1, self()]),
main([Pid1,Pid2], ParentPid).
main(Pids, ParentPid) ->
workload(5000),
gather(Pids),
ParentPid ! {self(),stop},
ok.
gather([]) -> ok;
gather([Pid|Pids]) -> receive {Pid,stop} -> gather(Pids) end.
workload(0) -> ok;
workload(N) -> math:sin(2), workload(N - 1).
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