Re: threads questions

[Alex Riesen <raa.lkml@gmail.com>]

On 9/4/05, Petter Shappen <shappen@gmail.com> wrote:
> As we all know the kernel maintain a data struct for the
> process(PCB),and also for the thread.Because of the latter's smaller
> than the former's,thread switching is faster than the process

not really. They just share some bits (like: address space, file
table, signal handlers, etc),
but aside from that - normal processes.

> switching.And from the book,I read that threads shares some data

What exactly is this book you're reading?

> information of the process,so my question is that when the threads of
> different processes have to switch,and the threads also use some data
> of the processes,will the process switch  before the threads?The speed
> of these threads switching is slower than normal,is that true ?

Why?

> How can the thread's advantage over process reflect?

It usually don't. Not noticably, in any case