> This patch adds an alternative virtual thread implementation where each > virtual thread is backed by an OS thread. It doesn't scale but it can be used > by ports that don't have continuations support in the VM. Aside from > scalability, the lack of continuations support means: > > 1. JVM TI is not supported when running with --enable-preview (the JVM TI > spec allows for this) > 2. jshell --enable-preview can't be used (as jshell uses the debugger APIs > and so needs JVM TI) > > The VM option "VMContinuations" is added as an experimental option so it can > be used by tests. A number of tests are changed to re-run with > -XX:-VMContinuations. A new jtreg property is added so that tests that need > the underlying VM support to be present can use "@requires vm.continuations" > in the test description. A follow-up change would be to add "@requires > vm.continuations" to the ~70 serviceability/jvmti/vthread that run with > preview features enabled.
Alan Bateman has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits: - Fixed another typo in comment - Merge - Fix typos in comments - Allowing linking without intrinsic stub, contributed-by: rehn - Continuation clinit should fail if no continuations support - Fix merge issue with test - Change VMContinuations to be experimental option, ensure JNI GetEnv returns EVERSION - Update - Expend test coverage - Merge - ... and 1 more: https://git.openjdk.java.net/jdk/compare/3deb58a8...a5c06cb6 ------------- Changes: https://git.openjdk.java.net/jdk/pull/8939/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8939&range=02 Stats: 747 lines in 72 files changed: 574 ins; 53 del; 120 mod Patch: https://git.openjdk.java.net/jdk/pull/8939.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8939/head:pull/8939 PR: https://git.openjdk.java.net/jdk/pull/8939
