wren/call_wren_call_root.wren at f23c82071a84f38a51189e115ca409f5f57cad53 - wren - Gitea: Git with a cup of tea

Meson/wren

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Bob Nystrom f23c82071a Don't allow calling the root fiber.

The VM used to not detect this case. It meant you could get into a
situation where another fiber's caller had completed. Then, when it
tried to resume that fiber, the VM would crash because there was nothing
to resume to.

This is part of thinking through all the cases around re-entrancy. Added
some notes for that too.

2018-07-21 10:02:29 -07:00

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 class Test {
   static run() {
     var root = Fiber.current
     System.print("begin root") // expect: begin root
     Fiber.new {
       System.print("in new fiber") // expect: in new fiber
       root.call() // expect runtime error: Cannot call root fiber.
       System.print("called root")
     }.transfer()
   }
 }