The A-B thread is halfway through execution to execute the C thread. How to implement it with Objective-C?

as mentioned above, how to implement it in OC?

Ios objective-c c
Mar.04,2021

where is the saying that a thread is halfway through execution?

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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-64f5-1b35557-2bfb3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35557-2bfb3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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