[ruby-cvs:78384] 36da0b3da1 (master): check interrupts at each frame pop timing.

Koichi Sasada	2019-11-29 17:39:06 +0900 (Fri, 29 Nov 2019)

  New Revision: 36da0b3da1

  https://github.com/ruby/ruby/commit/36da0b3da1

  Log:
    check interrupts at each frame pop timing.
    
    Asynchronous events such as signal trap, finalization timing,
    thread switching and so on are managed by "interrupt_flag".
    Ruby's threads check this flag periodically and if a thread
    does not check this flag, above events doesn't happen.
    
    This checking is CHECK_INTS() (related) macro and it is placed
    at some places (laeve instruction and so on). However, at the end
    of C methods, C blocks (IMEMO_IFUNC) etc there are no checking
    and it can introduce uninterruptible thread.
    
    To modify this situation, we decide to place CHECK_INTS() at
    vm_pop_frame(). It increases interrupt checking points.
    [Bug #16366]
    
    This patch can introduce unexpected events...

  Modified files:
    enum.c
    ext/-test-/postponed_job/postponed_job.c
    insns.def
    spec/ruby/core/thread/raise_spec.rb
    test/-ext-/postponed_job/test_postponed_job.rb
    test/ruby/test_thread.rb
    vm_insnhelper.c