NAME
priocntlset − generalized process scheduler control
SYNOPSIS
#include
<sys/types.h>
#include <sys/procset.h>
#include <sys/priocntl.h>
#include <sys/rtpriocntl.h>
#include <sys/tspriocntl.h>
long priocntlset(procset_t *psp, int cmd, /* arg */ ...);
DESCRIPTION
The priocntlset() function changes the scheduling properties of running processes. priocntlset() has the same functions as the priocntl() function, but a more general way of specifying the set of processes whose scheduling properties are to be changed.
cmd specifies the function to be performed. arg is a pointer to a structure whose type depends on cmd. See priocntl(2) for the valid values of cmd and the corresponding arg structures.
psp is a pointer to a procset structure, which priocntlset() uses to specify the set of processes whose scheduling properties are to be changed. The procset structure contains the following members:
idop_t p_op; /* operator connecting left/right sets */ idtype_t p_lidtype; /* left set ID type */ id_t p_lid; /* left set ID */ idtype_t p_ridtype; /* right set ID type */ id_t p_rid; /* right set ID */
The
p_lidtype and p_lid members specify the
ID type and ID of one ("left") set
of processes; the p_ridtype and p_rid members
specify the ID type and ID of a second
("right") set of processes. ID types and
IDs are specified just as for the priocntl()
function. The p_op member specifies the operation to
be performed on the two sets of processes to get the set of
processes the function is to apply to. The valid values for
p_op and the processes they specify are:
POP_DIFF
Set difference: processes in left set and not in right set.
POP_AND
Set intersection: processes in both left and right sets.
POP_OR
Set union: processes in either left or right sets or both.
POP_XOR
Set exclusive-or: processes in left or right set but not in both.
The following macro, which is defined in <procset.h>, offers a convenient way to initialize a procset structure:
#define setprocset(psp, op, ltype, lid, rtype, rid) \ (psp)->p_op = (op), \ (psp)->p_lidtype = (ltype), \ (psp)->p_lid = (lid), \ (psp)->p_ridtype = (rtype), \ (psp)->p_rid = (rid),
RETURN VALUES
Unless otherwise noted above, priocntlset() returns 0 on success. Otherwise, it returns −1 and sets errno to indicate the error.
ERRORS
The
priocntlset() function will fail if:
EAGAIN
An attempt to change the class of a process failed because of insufficient resources other than memory (for example, class-specific kernel data structures).
EFAULT
One of the arguments points to an illegal address.
EINVAL
The argument cmd was invalid, an invalid or unconfigured class was specified, or one of the parameters specified was invalid.
ENOMEM
An attempt to change the class of a process failed because of insufficient memory.
|
EPERM |
The effective user of the calling process is not super-user. |
ERANGE
The requested time quantum is out of range.
|
ESRCH |
None of the specified processes exist. |