lock_read man page on DigitalUNIX

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lock_read(9r)							 lock_read(9r)

NAME
       lock_read - General: Asserts a complex lock with read-only access

SYNOPSIS
       #include <kern/lock.h>

       void lock_read(
	       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 read-only 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_read routine asserts a lock  with  read-only  access  for  the
       resource	 associated  with  the	specified  lock structure pointer. The
       lock_read routine allows multiple kernel threads to access the resource
       read-only at the same time. When a read lock is asserted, the protected
       resource is guaranteed not to change.

       To release a previously asserted read lock, call the lock_done routine.

NOTES
       You must call lock_init (once only) prior to calling lock_read to  ini‐
       tialize	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 variables
       and in data structure members.

RETURN VALUES
       None

FILES
SEE ALSO
       Routines:   lock_done(9r),    lock_terminate(9r),    lock_try_read(9r),
       lock_try_write(9r), lock_write(9r)

       Data Structures: lock(9s)

								 lock_read(9r)
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