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         #include <sys/param.h>
         #include <sys/cpuset.h>
         cpuset(cpusetid_t *setid);
         cpuset_setid(cpuwhich_t which, id_t id, cpusetid_t setid);
         cpuset_getid(cpulevel_t level, cpuwhich_t which, id_t id,
                 cpusetid_t *setid);


         The cpuset family of system calls allow applications to control sets of
         processors and assign processes and threads to these sets.  Processor
         sets contain lists of CPUs that members may run on and exist only as long
         as some process is a member of the set.  All processes in the system have
         an assigned set.  The default set for all processes in the system is the
         set numbered 1.  Threads belong to the same set as the process which con-
         tains them, however, they may further restrict their set with the anony-
         mous per-thread mask.
         Sets are referenced by a number of type cpuset_id_t.  Each thread has a
         root set, an assigned set, and an anonymous mask.  Only the root and
         assigned sets are numbered.  The root set is the set of all CPUs avail-
         able in the system or in the system partition the thread is running in.
         The assigned set is a subset of the root set and is administratively
         assignable on a per-process basis.  Many processes and threads may be
         members of a numbered set.
         The anonymous set is a further thread-specific refinement on the assigned
         set.  It is intended that administrators will manipulate numbered sets
         using cpuset(1) while application developers will manipulate anonymous
         sets using cpuset_setaffinity(2).
         To select the correct set a value of type cpulevel_t is used.  The fol-
         lowing values for level are supported:
               CPU_LEVEL_ROOT      Root set
               CPU_LEVEL_CPUSET    Assigned set
               CPU_LEVEL_WHICH     Set specified by which argument
         The which argument determines how the value of id is interpreted and is
         of type cpuwhich_t.  The which argument may have the following values:
               CPU_WHICH_TID       id is lwpid_t (thread id)
               CPU_WHICH_PID       id is pid_t (process id)
               CPU_WHICH_CPUSET    id is a cpusetid_t (cpuset id)
               CPU_WHICH_IRQ       id is an irq number
         cpuset_setid() attempts to set the id of the object specified by the
         which argument.  Currently CPU_WHICH_PID is the only acceptable value for
         which as threads do not have an id distinct from their process and the
         API does not permit changing the id of an existing set.  Upon successful
         completion all of the threads in the target process will be running on
         CPUs permitted by the set.
         cpuset_getid() retrieves a set id from the object indicated by which and
         stores it in the space pointed to by setid.  The retrieved id may be that
         of either the root or assigned set depending on the value of level.
         level should be CPU_LEVEL_CPUSET or CPU_LEVEL_ROOT to get the set id from
         the process or thread specified by the id argument.  Specifying
         CPU_LEVEL_WHICH with a process or thread is unsupported since this refer-
         ences the unnumbered anonymous mask.
         The actual contents of the sets may be retrieved or manipulated using
         cpuset_getaffinity(2) and cpuset_setaffinity(2).  See those manual pages
         for more detail.


         Upon successful completion, the value 0 is returned; otherwise the
         value -1 is returned and the global variable errno is set to indicate the


         The following error codes may be set in errno:
         [EINVAL]           The which or level argument was not a valid value.
         [EDEADLK]          The cpuset_setid() call would leave a thread without a
                            valid CPU to run on because the set does not overlap
                            with the thread's anonymous mask.
         [EFAULT]           The setid pointer passed to cpuset_getid() or cpuset()
                            was invalid.
         [ESRCH]            The object specified by the id and which arguments
                            could not be found.
         [EPERM]            The calling process did not have the credentials
                            required to complete the operation.
         [ENFILE]           There was no free cpusetid_t for allocation.


         cpuset(1), cpuset_getaffinity(2), cpuset_setaffinity(2), CPU_SET(3),
         pthread_affinity_np(3), pthread_attr_affinity_np(3)


         The cpuset family of system calls first appeared in FreeBSD 7.1.

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