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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_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 */

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 ID s 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: 


#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 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.

See Also

priocntl(1) , priocntl(2)

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