User mode scheduling
User mode scheduling
How to enable preemptive multitasking in user mode..any source ?? Plz help...
Re: User mode scheduling
Clarification required. 
You need interrupts for preemptive multitasking; I don't think it's possible to configure and handle interrupts in user mode, so what do you want? Do you mean the normal case, where you want to implement preemptive multitasking in your kernel so that your user-mode programs may be multi-tasked? Multi-threading is an extension of the latter, if I understand right.
The basic idea is to have a timer interrupt. When it fires, save the state of the currently runnning process, decide which process to run next, restore its state, and return to it. EDIT: huh... you could do this in userspace if you can get a regular signal and can save state. The latter may be the hard part.
You need interrupts for preemptive multitasking; I don't think it's possible to configure and handle interrupts in user mode, so what do you want? Do you mean the normal case, where you want to implement preemptive multitasking in your kernel so that your user-mode programs may be multi-tasked? Multi-threading is an extension of the latter, if I understand right.The basic idea is to have a timer interrupt. When it fires, save the state of the currently runnning process, decide which process to run next, restore its state, and return to it. EDIT: huh... you could do this in userspace if you can get a regular signal and can save state. The latter may be the hard part.
Kaph — a modular OS intended to be easy and fun to administer and code for.
"May wisdom, fun, and the greater good shine forth in all your work." — Leo Brodie
"May wisdom, fun, and the greater good shine forth in all your work." — Leo Brodie
Re: User mode scheduling
Thanks for your guidance...eekee wrote:Clarification required.
The basic idea is to have a timer interrupt. When it fires, save the state of the currently runnning process, decide which process to run next, restore its state, and return to it. EDIT: huh... you could do this in userspace if you can get a regular signal and can save state. The latter may be the hard part.
My os support multi threading in kernel mode..now I want to multithread in user mode.. I am confused, how to set up the stack and how to tell the tss to point my user stack...