From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Garnett To: Stuart Hughes Cc: elix@sourceware.cygnus.com Subject: Re: RTLinux workshop and EL/IX press coverage on EETimes Date: Thu, 23 Dec 1999 04:23:00 -0000 Message-id: References: <01d801bf4c95$b7938640$2f2782c2@cygnus.co.uk> <38611114.8CE7C1D@zentropix.com> <3861F6B9.1FA6C63A@zentropix.com> X-SW-Source: 1999-q4/msg00017.html Stuart Hughes writes: > You're right, if a realtime task made a call to a Linux kernel service, > is not longer running at a realtime priority and this would need to be > made very clear. One of the ideas we had was to reserve a group of > priorities that would be 'kernel priority', and say that any RT task > calling these services must run at kernel priority, to enforce this we > would need some checking (maybe simply forcing the need to link to a > library). At the moment, this is only an idea, but I would love to see > some kind of transparent access to the Linux kernel from RT to make the > programmer feel that he/she is developing in a coherent environment. > I think this is important. The "two level" model that currently exists is, as someone on /. said yesterday, a bit of a hack. The more that can be done to produce a single seamless programmer model the better. > As you mention, the C library is also a problem and there is a need for > (and we have been exploring) a libc_rt.a library. Already some brave > people have been linking in some of the static libraries into their > applications (libm.a is common). Generally this works, but at the end > of that day you need to know what you are letting yourself in for. > > BTW Nick, can you let me have another e-mail address for you > (nickg@cygnus.co.uk has been bouncing). > Really? That is my canonical address and should work. You can try nickg@cygnus.com, but that is really just a forward to my .uk address. It may be that you are accidentally being zapped by out spam filter. I have just talked to our sysadmin and that is exactly what is happening. It appears that your IP address is in a range that someone sometime decided we didn't like. Probably as a result of spam from another user of your ISP. It should be fixed now. If you get any more bounces, let me know. -- Nick Garnett mailto:nickg@cygnus.co.uk Cygnus Solutions, UK http://www.cygnus.co.uk