09-11-2008
Authorizing Access to Dynamic Spatial-Temporal Data
Authorizing access to individual data objects based on spatial and temporal references is a complex task. Read this case study to learn one feasible approach.
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LEARN ABOUT OSF1
lock_read
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 pro-
tected 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 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 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)