Mscgen study - Light weight tool to create sequential diagram

http://www.mcternan.me.uk/mscgen/

Sample script:


msc {
  a, "b", c ;

  a->b [ label = "ab()" ] ;
  b->c [ label = "bc(TRUE)"];
  c->c [ label = "process(1)" ];
  c->c [ label = "process(2)" ];
  ...;
  c->c [ label = "process(n)" ];
  c->c [ label = "process(END)" ];
  a<-c [ label = "callback()"];
  ---  [ label = "If more to run", ID="*" ];
  a->a [ label = "next()"];
  a->c [ label = "ac()"];
  b<-c [ label = "cb(TRUE)"];
  b->b [ label = "stalled(...)"];
  a<-b [ label = "ab() = FALSE"];
}