hotspot/src/share/vm/runtime/safepoint.hpp
{- -------------------------------------------
(1) _waiting_to_block フィールドの値を減少させるだけ.
(この値は safepoint を開始していいかどうかの判定に用いられる.
See: SafepointSynchronize::begin())
---------------------------------------- -}
static void signal_thread_at_safepoint() { _waiting_to_block--; }
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