lock_write(9r)															    lock_write(9r)

NAME

       lock_write - Asserts a complex lock with write access

SYNOPSIS

       #include <kern/lock.h>

       void lock_write(
	       lock_t lock_structptr );

ARGUMENTS

       Specifies  a  pointer  to  the  complex	lock structure, lock. This is the lock structure associated with the resource on which you want to
       assert a complex lock with write access. The lock structure is an opaque data structure; that is, its associated members are referenced and
       manipulated by the operating system and not by the user of the complex lock mechanism.

DESCRIPTION

       The  lock_write	routine  asserts a lock with exclusive write access for the resource associated with the specified lock structure pointer.
       This means that once a write lock is asserted, no other kernel thread can gain read or write access to the resource until it is released.

       To release a complex write lock successfully asserted by lock_write, call the lock_done routine.

NOTES

       You must call lock_init (once only) prior to calling lock_write to initialize the lock structure pointer for  the  resource.   A  resource,
       from  the  kernel  module's standpoint, is data that more than one kernel thread can manipulate. You can store the resource in global vari-
       ables and in data structure members.

RETURN VALUES

       None

FILES

SEE ALSO

       Routines: lock_done(9r), lock_read(9r), lock_terminate(9r), lock_try_read(9r), lock_try_write(9r)

       Data Structures: lock(9s)

																    lock_write(9r)