priocntlset(2)

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

priocntlset() 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_tp_op;/∗ operator connecting left/right sets ∗/
idtype_tp_lidtype; /∗ left set ID type ∗/
id_tp_lid;/∗ left set ID ∗/
idtype_tp_ridtype; /∗ right set ID type ∗/
id_tp_rid;/∗ right set ID ∗/

p_lidtype and p_lid specify the ID type and ID of one (“left”) set of processes; p_ridtype and p_rid 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. p_op 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:

#definesetprocset(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 a value of 0 on success. priocntlset() returns −1 on failure and sets errno to indicate the error.

ERRORS

priocntlset() fails if one or more of the following are true :

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.

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