06-05-2014
I prefer Advanced Tea Substitute, it tastes almost, but not quite, entirely unlike tea. ;-)
Programming is about problem solving, and programming well is about solving problems without repeating a lot of logic over and over. Can you get the results that you want without hard coding magic values, can someone understand what your program is doing and why? Can someone new come in and maintain the code with out just slapping on more code? You don't need to be a genius, you just need to write thoughtful well documented code that adapts to change easily.
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LEARN ABOUT NETBSD
setpriority
GETPRIORITY(2) BSD System Calls Manual GETPRIORITY(2)
NAME
getpriority, setpriority -- get/set program scheduling priority
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/resource.h>
int
getpriority(int which, id_t who);
int
setpriority(int which, id_t who, int prio);
DESCRIPTION
The scheduling priority of the process, process group, or user, as indicated by which and who is obtained with the getpriority() call and set
with the setpriority() call. which is one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, and who is interpreted relative to which (a process
identifier for PRIO_PROCESS, process group identifier for PRIO_PGRP, and a user ID for PRIO_USER). A zero value of who denotes the current
process, process group, or user. prio is a value in the range -20 to 20. The default priority is 0; lower priorities cause more favorable
scheduling. A value of 19 or 20 will schedule a process only when nothing at priority <= 0 is runnable.
The getpriority() call returns the highest priority (lowest numerical value) enjoyed by any of the specified processes. The setpriority()
call sets the priorities of all of the specified processes to the specified value. Only the super-user may lower priorities.
RETURN VALUES
Since getpriority() can legitimately return the value -1, it is necessary to clear the external variable errno prior to the call, then check
it afterward to determine if a -1 is an error or a legitimate value. The setpriority() call returns 0 if there is no error, or -1 if there
is.
ERRORS
getpriority() and setpriority() will fail if:
[ESRCH] No process was located using the which and who values specified.
[EINVAL] which was not one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER.
In addition to the errors indicated above, setpriority() will fail if:
[EPERM] A process was located, but neither its effective nor real user ID matched the effective user ID of the caller.
[EACCES] A non super-user attempted to lower a process priority.
SEE ALSO
nice(1), fork(2), renice(8)
HISTORY
The getpriority() function call appeared in 4.2BSD.
BSD
April 25, 2004 BSD