rb_thread_blocking_region_begin   24 include/ruby/backward/rubysig.h RUBY_EXTERN struct rb_blocking_region_buffer *rb_thread_blocking_region_begin(void);
rb_thread_blocking_region_begin   26 include/ruby/backward/rubysig.h #define TRAP_BEG do {void *__region = rb_thread_blocking_region_begin(void);