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voidmnwzp 你说的是这个吧
There are two scenarios in which a virtual thread cannot be unmounted during blocking operations because it is pinned to its carrier:
When it executes code inside a synchronized block or method, or
When it executes a native method or a foreign function.
官方解释：
The scheduler does not compensate for pinning by expanding its parallelism. Instead, avoid frequent and long-lived pinning by revising synchronized blocks or methods that run frequently and guard potentially long I/O operations to use java.util.concurrent.locks.ReentrantLock instead. There is no need to replace synchronized blocks and methods that are used infrequently (e.g., only performed at startup) or that guard in-memory operations. As always, strive to keep locking policies simple and clear.
后续优化：
In a future release we may be able to remove the first limitation above, namely pinning inside synchronized. The second limitation is required for proper interaction with native code.