[ruby-cvs:72412] k0kubun:r65312 (trunk): mjit.c: prevent from accessing expired job

[k0kubun at ruby-lang.org]

k0kubun	2018-10-23 09:09:10 +0900 (Tue, 23 Oct 2018)

  New Revision: 65312

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65312

  Log:
    mjit.c: prevent from accessing expired job
    
    Given that `copy_cache_from_main_thread()` breaks the loop when `stop_worker_p`
    is TRUE, memory of `job` allocated by `alloca` may be invalid if `stop_worker_p`
    is already TRUE.
    
    mjit_worker.c: explain why `copy_cache_from_main_thread()` should not
    stop checking `stop_worker_p`.

  Modified files:
    trunk/mjit.c
    trunk/mjit_worker.c