CODEWITHSUNDEEP
unixlinux-kerneloperating-systemqemuxv6
user3274335
user3274335

Reputation: 85

Race Condition in xv6

I am a newbie in the field of OS and trying to learn it by hacking into xv6.My doubt is can we decide before making a call to fork whether to run parent or child using system calls.i,e i can have a function pass an argument to kernel space and decide whether to run parent or child to run first.The argument can be: 1-parent 0-child.

Upvotes: 1

Views: 826

Answers (1)

mike
mike

Reputation: 220

I think the problem is that fork() just creates a copy of the process and makes it runnable, but the module responsible for allowing it to run is the scheduler. Therefore, the parameter you mentioned should also provide this information to the scheduler in some way.

If you manage to do that, I think you can enqueue the two process in the order you prefer in the runnable queue and let the scheduler pick the first runnable process.

However, you cannot control for how long the first process will run. In fact, at the next scheduling event another process might be allowed to run and the previous one would be suspended.

Upvotes: 1

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