DragonFly On-Line Manual Pages

SYSINIT(9)            DragonFly Kernel Developer's Manual           SYSINIT(9)

NAME
     SYSINIT -- Subsystem initialization

SYNOPSIS
     #include <sys/kernel.h>

     SYSINIT(uniquifier, subsystem, order, func, ident);

DESCRIPTION
     SYSINIT is a mechanism used in the initialization of kernel subsystems.
     The function func is called with the argument ident either when the ker-
     nel is booted or when a module is loaded, depending on where the invoca-
     tion is found.

     The subsystem and order parameters control when the function is called
     during initialization.  The kernel calls all of the functions in a sub-
     system before advancing to the next one.

     Most SYSINIT invocations will use one of these identifiers for subsystem:

     SI_SUB_DRIVERS         Device driver initialization

     SI_SUB_VFS             Virtual file system, vnodes, vnode recovery, name-
                            cache

     SI_SUB_HELPER_THREADS  Helper threads (used by random number generator)

     DV SI_SUB_KTHREAD_VM   VM daemon initialization

     SI_SUB_KTHREAD_IDLE    Idle-time kernel threads

     These subsystems are initialized in the order they are listed.  For the
     complete list of subsystems, consult <sys/kernel.h>.

     The order parameter controls when in a subsystem a function is called.
     The SI_ORDER_FIRST parameter marks a function to be called first in sub-
     system.  The SI_ORDER_SECOND and SI_ORDER_THIRD flags mark a function to
     be called second and third, respectively.  The SI_ORDER_MIDDLE flag marks
     a function to be called somewhere in the middle of a subsystem's initial-
     ization.  The SI_ORDER_ANY flag marks a function to be called after all
     other types of functions.

     The uniquifier parameter is a unique identifier for this SYSINIT invoca-
     tion.

EXAMPLES
     This example calls the function rand_thread_init() with a NULL argument
     at any point while initializing helper threads:

     SYSINIT(rand, SI_SUB_HELPER_THREADS, SI_ORDER_ANY, rand_thread_init, NULL);

DragonFly 3.5                 September 29, 2010                 DragonFly 3.5