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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:
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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 */
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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.
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POP_AND
- Set
intersection: processes in both left and right sets.
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POP_OR
- Set
union: processes in either left or right sets or both.
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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:
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#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),
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