diff --git a/content/news/2023/10/20/clojure-1-12-alpha5.doc b/content/news/2023/10/20/clojure-1-12-alpha5.doc index 9a3bd875..1cfdba01 100644 --- a/content/news/2023/10/20/clojure-1-12-alpha5.doc +++ b/content/news/2023/10/20/clojure-1-12-alpha5.doc @@ -7,4 +7,4 @@ Clojure 1.12.0-alpha5 is now available and we encourage you to try it and give u == Use locks instead of synchronized blocks around user code in lazy-seq and delay -Clojure users want to use virtual threads on JDK 21. Prior to 1.12, Clojure lazy-seqs and delays, in order to enforce run-once behavior, ran user code under synchronized blocks, which don't participate in cooperative blocking. Thus if that code did e.g. blocking I/O it would pin a real thread. JDK 21 may emit the following warning for this . To avoid this pinning, in 1.12 we've changed lazy-seqs and delay to use locks instead of synchronized blocks. +Clojure users want to use virtual threads on JDK 21. Prior to 1.12, Clojure lazy-seqs and delays, in order to enforce run-once behavior, ran user code under synchronized blocks, which don't participate in cooperative blocking. Thus if that code did e.g. blocking I/O it would pin a real thread. JDK 21 may emit warnings for this when using `-Djdk.tracePinnedThreads=full`. To avoid this pinning, in 1.12 we've changed lazy-seqs and delay to use locks instead of synchronized blocks.