jdk.util.concurrent.atomic.AtomicStampedReference — clojure-interop/java.util.concurrent 1.0.0

An AtomicStampedReference maintains an object reference along with an integer stamp, that can be updated atomically.

Implementation note: This implementation maintains stamped references by creating internal objects representing boxed [reference, integer] pairs.

->atomic-stamped-reference clj

(->atomic-stamped-reference initial-ref initial-stamp)

Constructor.

Creates a new AtomicStampedReference with the given initial values.

initial-ref - the initial reference - AtomicStampedReference.V initial-stamp - the initial stamp - int

attempt-stamp clj

(attempt-stamp this expected-reference new-stamp)

Atomically sets the value of the stamp to the given update value if the current reference is == to the expected reference. Any given invocation of this operation may fail (return false) spuriously, but repeated invocation when the current value holds the expected value and no other thread is also attempting to set the value will eventually succeed.

expected-reference - the expected value of the reference - AtomicStampedReference.V new-stamp - the new value for the stamp - int

returns: true if successful - boolean

compare-and-set clj

(compare-and-set this expected-reference new-reference expected-stamp new-stamp)

Atomically sets the value of both the reference and stamp to the given update values if the current reference is == to the expected reference and the current stamp is equal to the expected stamp.

expected-reference - the expected value of the reference - AtomicStampedReference.V new-reference - the new value for the reference - AtomicStampedReference.V expected-stamp - the expected value of the stamp - int new-stamp - the new value for the stamp - int

returns: true if successful - boolean

get clj

(get this stamp-holder)

Returns the current values of both the reference and the stamp. Typical usage is int[1] holder; ref = v.get(holder); .

stamp-holder - an array of size of at least one. On return, stampholder[0] will hold the value of the stamp. - int[]

returns: the current value of the reference - AtomicStampedReference.V

get-reference clj

(get-reference this)

Returns the current value of the reference.

returns: the current value of the reference - AtomicStampedReference.V

get-stamp clj

(get-stamp this)

Returns the current value of the stamp.

returns: the current value of the stamp - int

set clj

(set this new-reference new-stamp)

Unconditionally sets the value of both the reference and stamp.

new-reference - the new value for the reference - AtomicStampedReference.V new-stamp - the new value for the stamp - int

weak-compare-and-set clj

(weak-compare-and-set this
                      expected-reference
                      new-reference
                      expected-stamp
                      new-stamp)

Atomically sets the value of both the reference and stamp to the given update values if the current reference is == to the expected reference and the current stamp is equal to the expected stamp.

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.

expected-reference - the expected value of the reference - AtomicStampedReference.V new-reference - the new value for the reference - AtomicStampedReference.V expected-stamp - the expected value of the stamp - int new-stamp - the new value for the stamp - int

returns: true if successful - boolean