lock(9) [netbsd man page]

LOCK(9) 						   BSD Kernel Developer's Manual						   LOCK(9)

NAME

     lock, simple_lock_init, simple_lock, simple_lock_try, simple_unlock, simple_lock_freecheck, simple_lock_dump, lockinit, lockmgr, lockstatus,
     lockmgr_printinfo, spinlockinit, spinlockmgr -- kernel lock functions

DESCRIPTION

     These interfaces have been obsoleted and removed from the system.

     Please see the condvar(9), mutex(9), and rwlock(9) manual pages for information on kernel synchronisation primitives.

SEE ALSO

     condvar(9), mutex(9), rwlock(9)

HISTORY

     The kernel locking API first appeared in 4.4BSD-lite2, and was replaced in NetBSD 5.0.

BSD
								 January 30, 2008							       BSD

simple_lock_try(9r)													       simple_lock_try(9r)

NAME

       simple_lock_try - General: Tries to assert a simple lock

SYNOPSIS

       #include <kern/lock.h>

       boolean_t simple_lock_try(
	       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_try  routine tries to assert a lock with read and write access for the resource associated with the specified simple lock.
       The main difference between this routine and simple_lock is that simple_lock_try returns immediately if the  resource  is  already  locked,
       while  simple_lock  spins until the lock has been obtained. Thus, call simple_lock_try when you need a simple lock but the code cannot spin
       until the lock is obtained.

       To release a simple lock successfully asserted by simple_lock_try, call the simple_unlock routine.

RETURN VALUES

       The simple_lock_try routine returns one of the following values: The simple_lock_try routine successfully asserted the  simple  lock.   The
       simple_lock_try routine failed to assert the simple lock.

FILES

SEE ALSO

       Routines: decl_simple_lock_data(9r), simple_lock(9r), simple_lock_init(9r), simple_lock_terminate(9r), simple_unlock(9r)

       Data Structures: slock(9s)

															       simple_lock_try(9r)