clojure.core/locking

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Type: macro Added: Clojure 1.0 Examples: 2 Runnable: 0

([x & body])

Executes exprs in an implicit do, while holding the monitor of x. Will release the monitor of x in all circumstances.

Examples

by gstamp on 2010-10-05 . May have evaluation errors. ▶

(def o (Object.)) (future (locking o (Thread/sleep 5000) (println "done1"))) ;; Now run this before 5 seconds is up and you'll ;; find the second instance waits for the first instance to print done1 ;; and release the lock, and then it waits for 1 second and prints done2 (Thread/sleep 1000) ; give first instance 1 sec to acquire the lock (locking o (Thread/sleep 1000) (println "done2")) ;; => done1 ;; => done2 ;; => nil ;; locking operates like the synchronized keyword in Java.

by liuchong on 2019-07-18 . May have evaluation errors. ▶

(def x 1) ;; Reentrant (locking x (locking x (println "hehe in")) (println "hehe out")) ;; => hehe in ;; => hehe out ;; => nil

See also

• clojure.core/future (1)

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