lock_try_read - General: Tries to assert a complex lock
with read-only access
lock_t lock_structptr );
Specifies a pointer to the complex lock structure, lock.
This is the lock structure associated with the resource on
which you want to try to assert a complex lock with readonly
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.
The lock_try_read routine tries to assert a complex lock
(without blocking) with read-only access for the resource
associated with the specified lock structure pointer. To
release a complex lock with read-only access successfully
asserted by lock_try_read, call the lock_done routine.
You must call lock_init (once only) prior to calling
lock_try_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.
The lock_try_read routine returns one of the following
values: The attempt to acquire the read-only complex lock
was successful. The attempt to acquire the read-only complex
lock was unsuccessful.
Routines: lock_done(9r), lock_terminate(9r),
Data Structures: lock(9s)
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