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J. Nick Koston
216cc47e4e
readv() holds LWIP_LOCK for the entire scatter-gather operation and previously called read() internally, which would call wait_for_data_() → socket_delay() while the lock was held — blocking recv_fn() on RP2040. Extract read_locked_() with the state checks and copy logic. Both read() and readv() call wait_for_data_() before acquiring the lock, then use read_locked_() under the lock.
