On Sun, May 25, 2008 at 12:28 AM, William Case <billlinux@xxxxxxxxxx> wrote: > Thank you Manish; > > I think I am starting to approach an answer I hadn't thought of. Let me > try it out below. Please correct me if I am wrong. > > > On Sat, 2008-05-24 at 23:40 +0530, Manish Katiyar wrote: > [snip] > >> I don't know about other OS's, but swapper is *handcrafted* using the >> macro INIT_TASK() macro. > > If anyone can confirm that there are other OS's that initiate prcesses > differently from the Linux parent-child process. No details are really > needed, I would just like to satisfy myself that either all OS's > basically use the parent-child modal or that there are several different > ways that it can be done. For example, would the Windows registry > system be an alternative?? > >> Suppose if we had to start all the processes >> from raw probably setting the initial values for the task just as >> swapper will take some time, and you might want to use some kind of >> template from you can derive the default values of the raw process >> quickly.....isn't it ??? ....... And isn't it more beneficial if you >> get the values from the process which is *most* closest in nature to >> yours so that you have to change only the few key values like tgid, >> ppid etc. >> > To test my understanding by restating: > > At boot time, when starting PID 0 (the swapping process) some?, > several?, all? of the environmental CONSTANTS for my particular system > are loaded and initialized. By passing those constant values on through > a parent-child modal to each new process those new processes don't have > to re-initialize those constants. And if I am not wrong, that is *one of the reasons* why you have some members as pointers and some as normal variables in task_struct, so that the required information can be quickly copied by just setting the proper pointer without copying the whole info. Members like *fs, *files and many other. > > Is this true? And, might there be other reasons to use a parent-child > modal? > >> Ohh and isn't it the same parent child relationship that we were >> discussing, or in other words it is a raw process getting default >> values from a closest template ? >> > > As stated above, this sounds close to a BINGO. >> > > [snip >> > > >> -- >> Thanks & Regards, >> ******************************************** >> Manish Katiyar ( http://mkatiyar.googlepages.com ) >> 3rd Floor, Fair Winds Block >> EGL Software Park >> Off Intermediate Ring Road >> Bangalore 560071, India >> *********************************************** > -- > Regards Bill > > -- Thanks & Regards, ******************************************** Manish Katiyar ( http://mkatiyar.googlepages.com ) 3rd Floor, Fair Winds Block EGL Software Park Off Intermediate Ring Road Bangalore 560071, India *********************************************** -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
