> JEP 444 proposes to make virtual threads a permanent feature in Java 21. The > APIs that were preview APIs in Java 19/20 are changed to permanent and their > `@since`/equivalent are changed to 21 (as per the guidance in JEP 12). The > JNI and JVMTI versions are bumped as this is the first change in 21 to need > the new version number. A lot of tests are updated to drop `@enablePreview` > and --enable-preview. > > There is one API change from Java 19/20, the preview API > Thread.Builder.allowSetThreadLocals(boolean) is dropped. This requires an > update to the JVMTI GetThreadInfo implementation to read the TCCL > consistently. > > In addition, there are a small number of implementation changes to sync up > from the loom fibers branch: > > - A number of stack frames are `@Hidden` to reduce noise in the stack traces. > This exposed a few issues with the stack walker code. More specifically, the > cases where end of a continuation falls precisely at the end of the batch, > or where the remaining frames are hidden, weren't handled correctly. > - The code to emit the JFR jdk.ThreadSleepEvent is refactored so it's in > Thread rather than in two classes. > - A few robustness improvements for OOME and SOE. There is more to do here, > for future PRs. > - New system property to print a stack trace when a virtual thread sets its > own value of a TL. > - ThreadPerTaskExecutor is changed to use FutureTask. > > Testing: tier1-6.
Alan Bateman has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision: - ThreadSleepEvent refactoring - Merge - Merge - Initial sync from fibers branch ------------- Changes: - all: https://git.openjdk.org/jdk/pull/13203/files - new: https://git.openjdk.org/jdk/pull/13203/files/1c62dc8a..7906dbb4 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=13203&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13203&range=00-01 Stats: 2112 lines in 47 files changed: 1050 ins; 822 del; 240 mod Patch: https://git.openjdk.org/jdk/pull/13203.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13203/head:pull/13203 PR: https://git.openjdk.org/jdk/pull/13203
