If a thread is in upgradeable mode, and there are no threads waiting to enter write mode, any number of other threads can enter read mode, even if there are threads waiting to enter upgradeable mode.
英
美
- 如果有一個(gè)線(xiàn)程處于可升級讀模式，并且沒(méi)有任何線(xiàn)程等待進(jìn)入寫(xiě)模式，那么任意數量的線(xiàn)程可以進(jìn)入讀模式，即使有線(xiàn)程在等待進(jìn)入可升級讀模式。
