Where in the source code of java's fork/join framework can you see that the invokeAll method performs the work itself after assigning the task to other threads?

looking at some blogs on the Internet, it is said that if using invokeAll is equivalent to dividing A to B, both An and B will finish the work.
where can I see the source code of https://blog.csdn.net/cxl0921.
https://www.liaoxuefeng.com/d.
invokeAll?
take public static void invokeAll (ForkJoinTask T1, ForkJoinTask T2) as an example.

Mar.03,2021
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Message : Disk full (/tmp/#sql-temptable-64f5-49b1119-10e36.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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