namespace eval threads {
  variable threads [list main [thread::id]]
  variable log [logger::init tclircc::threads]

  proc manage {tid name} {
    variable threads
    variable log
    dict set threads $name $tid
    ${log}::debug "managing thread $tid as \"$name\""

    thread::send -head $tid {
      namespace eval t {
        variable ns
        proc update {} {
          variable ns
          thread::send -head [set ns(main)] threads::update
        }
        proc ns {name} {
          variable ns
          set ns($name)
        }
      }
    }

    ::threads::update
  }
  proc unmanage {name} {
    variable threads
    variable log
    dict unset threads $name
    ${log}::debug "unmanaging thread $tid (\"$name\")"
    ::threads::update
  }
  proc update {} {
    variable threads
    dict for {name tid} $threads {
      if ![thread::exists $tid] {dict unset $threads $name}
    }
    dict for {name tid} $threads {
      set payload {array unset t::ns; }
      dict for {n t} $threads {
        append payload {set t::ns(} $n {) } $t {; }
      }
      thread::send -head $tid $payload
    }
    ::update
  }
  proc debug {} {
    variable log
    update
    foreach key [array names threads::ns] {
      ${log}::debug "thread \"$key\" has id [set threads::ns($key)]"
    }
  }
}
namespace eval t {
  variable ns
  proc update {} {
    variable ns
    thread::send -head [set ns(main)] threads::update
  }
  proc ns {name} {
    variable ns
    set ns($name)
  }
}