How to ensure the atomicity of the redis command?

We all know that a single redis command can guarantee atomicity, so is this atomicity guaranteed by the operating system"s CAS primitive?

Mar.14,2021

redis is a single-threaded event loop. One operation is executed before the next operation is executed, so there is no need for cas.
see that the source code uses the _ _ sync_bool_compare_and_swap, in gcc, but this has nothing to do with the atomicity that we users want to achieve.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bf4b-2b021.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bf4b-2b021.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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