SYSCALL - multitasking & Interruput event

Dear OxAX ,
Thanks for your efforts for writing "Linux Inside" . It has cleared most of my doubts.
I request you to please elaborate few technical doubts about System call .

1. System call in multitasking environment :
a. What will happen if higher priority task need system resources by SYSCALL but already lower priority task's SYSCALL in running ( kernel code is executing ) ?

b. During one system call multitasking / multi threading is still possible or only one thread will have access to SYSCALL ?

2. System call during External / Peripheral interrupt :
a. what will happen if external interrupt or higher priority pheripheral interrupt triggers while processing SYSCALL ?

Request you to please reply on this & if possible please add explanation in "Linux Inside"

Regards,
Gaurav

这是一个关于 Linux 内核内部机制（涉及系统调用、多任务处理和中断）的澄清请求。该 issue 并未提议对仓库进行具体更改。要解决它，需要理解相关的内核代码（例如 kernel/sys.c、arch/x86/entry/entry_64.S）以及书中关于系统调用的现有内容。目标是为《Linux Inside》这本书起草一段解释或补充内容。

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