I use the word 'process' to describe the working memory context of an application. I use the word 'thread' to describe the execution contexts which actuall run code in a process. In Linux, each thread actuall obtains a unique thread id and process id, whereas in other Unix implementations, each thread gets a unique thread id, but share a common process id. My understanding, which may be wrong, is that all non-realtime threads share a common base level priority. Non-realtime threads never preempt each other to obtain the runnable state for the CPU. Having said that, I don't know what function "nice" performs on a thread (it is not obvious looking at the kernel code). I suspect that it detracts from the percentage of time the thread gets ron from the pool of time allocated to non-realtime threads (?). Realtime threads, can be run only as root, and their priority can be set using the POSIX function shed_setparam. These threads preempt other threads when their state becomes runnable. Take a look at man -k sched to get a list of realtime scheduling functions. Make sure that any realtime threads you create perform some sort of blocking (they do not run continuously), or you will never see your console I/O until the next reboot :) Nat On Sun, 2003-05-04 at 07:35, Jose Luis Alarcon wrote: > Hi. > > Please, i wanna quest you how the priority of the > processes is asigned. > > I am trying know the mechanism for asign the priority > and who is the 'entity' that asign it. The developer of > an aplication?, the developers of the kernel?, the cpu > by itself?. > > Thanks you, very much, in advance. > > Regards. > > Jose. > > > http://linuxespana.scripterz.org > > FreeBSD RELEASE 4.8. > Mandrake Linux 9.0 Kernel 2.4.19 XFS. > Registered Linux User #213309. > Memories..... You are talking about memories. > Rick Deckard. Blade Runner. > > _____________________________________________________________ > Get your own free tiggerfan.com email address!! > DisneySites!! - http://www.disneysites.com/webmail/tiggerfan > > _____________________________________________________________ > Select your own custom email address for FREE! Get you@yourchoice.com w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
