Hi all, I have a doubt on PCI driver initialisation. 1.How is the base address allocated for a PCI device and what is its range? Is it similar to ISA devices where we specify the base addr ranges and irq to be assigned. 2. Does PCI has its own range of base addresses or is it equivalent to ISA buses? 3. Which part of PCI code handles the base addr and irq registration ? Thanks in advance, Bharani. -----Original Message----- From: kernelnewbies-bounce@nl.linux.org [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of Momchil Velikov Sent: Tuesday, 23 April 2002 6:51 PM To: Sridhar N (by way of Sridhar N<srin@srin.homelinux.net>) Cc: Mailing List:Kernel Newbies; Erik Mouw Subject: Re: User-level threads and preemption >>>>> "Sridhar" == Sridhar N <<srin@symonds.net> (by way of Sridhar N <srin@srin.homelinux.net>)> writes: Sridhar> On Monday 22 April 2002 05:02 am, Erik Mouw wrote: >> > If one userspace thread is doing a system call and is pre-empted, can >> > the process execute another of its own thread that also executes a >> > system call ? >> >> Sure, why not? Threads and processes are almost the same on linux, so >> if a process can be preempted, a thread can also be preempted. Sridhar> Sorry, i suppose i didn't say it right. I wasn't talking about the threads Sridhar> that you create using a system call ( eg. clone() ), but i was referring to Sridhar> user-space libs ( like pthread,etc, ) _Usually_ it is not possible, as the kernel is unaware of the existance of some user space date structures, which the user use to call "threads" ;). Thus, a blocked userspace thread blocks the entire process. In GNU/Linux that's the case with GNU Pth, as they are pure userspace, unlike Linuxthreads, which are pure kernelspace. Why "usually" ? :) Because there are systems, where the userland is notified when a thread is put to sleep, thus given the chance to run another one. This is usually called "scheduler activations" with the most notable (or of most practical interest) example being the upcoming FreeBSD 5.0 kernel. Regards, -velco -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ *************************************************************************** This message is proprietary to Future Software Limited (FSL) and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. FSL accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus. *************************************************************************** -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
