simple_lock(9r)simple_lock(9r)NAME
simple_lock - General: Asserts a simple lock
SYNOPSIS
#include <kern/lock.h>
void simple_lock(
simple_lock_t slock_ptr );
ARGUMENTS
Specifies a pointer to a simple lock structure. You can declare this simple lock structure by using the decl_simple_lock_data routine.
DESCRIPTION
The simple_lock routine asserts a lock with exclusive access for the resource associated with the specified slock structure pointer. This
means that no other kernel thread can gain access to the locked resource until you call simple_unlock to release it. Because simple locks
are spin locks, simple_lock does not return until the lock has been obtained.
NOTES
You must call simple_lock_init (once only) prior to calling simple_lock to initialize the simple lock structure 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: decl_simple_lock_data(9r), simple_lock_init(9r), simple_lock_terminate(9r), simple_lock_try(9r), simple_unlock(9r)
Data Structures: slock(9s)simple_lock(9r)
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decl_simple_lock_data(9r)decl_simple_lock_data(9r)NAME
decl_simple_lock_data - General: Declares a simple lock structure
SYNOPSIS
#include <kern/lock.h>
void decl_simple_lock_data(
char class,
char name );
ARGUMENTS
Specifies the class of the declaration. For example, you pass the keyword extern if you want to declare the simple lock structure as an
external structure. Specifies the name you want the decl_simple_lock_data routine to assign to the declaration of the simple lock struc-
ture.
DESCRIPTION
The decl_simple_lock_data routine declares a simple lock structure, slock, of the specified name. You declare a simple lock structure to
protect data structures and device register access. You use decl_simple_lock_data to declare a simple lock structure and then pass it to
the following simple lock-specific routines: simple_lock_init, simple_lock, simple_lock_try, simple_unlock, and simple_lock_terminate.
RETURN VALUES
None
FILES SEE ALSO
Routines: simple_lock(9r), simple_lock_try(9r), simple_lock_init(9r), simple_unlock(9r)
Data Structures: slock(9s)decl_simple_lock_data(9r)
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