Commit cd057fa80c74dcf1d0a74290cb5ad6cdc3136428
2021-03-07T02:57:46
mbrtowc: Allow locking optimization independently of 'unlocked-io'. * lib/mbtowc-lock.h: Test GNULIB_MBRTOWC_SINGLE_THREAD instead of USE_UNLOCKED_IO. * doc/multithread.texi: Document GNULIB_MBRTOWC_SINGLE_THREAD.