🚀 go-pugleaf

In <1993Jan27.195309.15120@cpio1.fr.mugnet.org> bernard@cpio1.fr.mugnet.org (Bernard Fouche) writes:

>Hi wizards!

>I run many applications that need to call very often the time(2)
>system call. I do not see how I could design my programs to do without
>having to get the result of time(2) very ofen.

>But I wonder if there is a way (on a 486 running Dell Unix 2.0 at
>least) to get time information without having to do a system call each
>time.

Every time you do a system call you are giving UNIX a chance
to swap your process.

>For instance, does someone know if I can get a pointer toward the
>value of time that is stored somewhere in the system ? Of course this
>should work with processes having no suid bit set nor running as root
>and files like /unix or /dev/kmem must stay to be not readable by
>anyone :-)

How about this. Each process attaches to a small shared memory
segment when they start. 1 process has an alarm go off every
second, it does the time() call and updates the shared memory.
Whenever any other process requires the time, it simply uses the
shared memory value. No setuid required, or running as root, or
touching of /unix or /de/kmem required. Have a nice day :)

Gord Cody - all opinions are MINE,MINE,MINE #$@%^#!##:^)  gcody@gandalf.ca
Gandalf Mobile Systems Inc. - the company has its own     613-723-6500 x 8817
2 Gurdwara Rd. Nepean Ont. Can.  - #define  th_th_th_thats_all_folks  }