🚀 go-pugleaf

[Someone noted that I managed to mangle one of the rlimit structure
field names, as well as the spelling of concurrency.  I've corrected
both, and canceled the earlier article -- Eric ]

rosenkra@convex.com (William Rosenkranz) writes:
- In article <1993Jan19.132612.4970@wl.com> agrafiot@wl.com (Dimitris Agrafiotis) writes:
- >Is there a system call that returns the number of processors available
- >on a convex?
- >Thanks
- 
- getsysinfo(2) does report the number of CPUs in the box. however, if you
- have set "limit concurrency n" from the shell to a lesser number, you can
- also do a limit command from within a program to find out the number of
- processes actually used (note that i don't know the behavior if your
- launching shell is sh or ksh, i just know this works if it is csh):

	A much better way to get the resource limits in an application
is to use getrlimit(2).  Starting up a Cshell is such a waste!

	A small sample routine to get the concurrency limit of the
current process:

#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>

int main()
{
struct rlimit info;
	
	if(getrlimit(RLIMIT_CONCUR, &info)) {
		perror("rlimit");
		return 1;
	}

	printf("current concurrency: %d\n", info.rlim_cur);
	printf("max concurrency: %d\n", info.rlim_max);
	return 0;
}
-- 
Eric Schnoebelen		eric@cirr.com		schnoebe@convex.com
Life is the only game in which the object of the game is to learn the rules.