THREAD_SHIELD_WAITING_MASK 4333 thread.c       #define rb_thread_shield_waiting(b) (int)((RBASIC(b)->flags&THREAD_SHIELD_WAITING_MASK)>>THREAD_SHIELD_WAITING_SHIFT)
THREAD_SHIELD_WAITING_MASK 4340 thread.c           if (w > (unsigned int)(THREAD_SHIELD_WAITING_MASK>>THREAD_SHIELD_WAITING_SHIFT))
THREAD_SHIELD_WAITING_MASK 4342 thread.c           RBASIC(b)->flags &= ~THREAD_SHIELD_WAITING_MASK;
THREAD_SHIELD_WAITING_MASK 4352 thread.c           RBASIC(b)->flags &= ~THREAD_SHIELD_WAITING_MASK;