On Tue, 31 May 2022 15:39:39 GMT, Alan Bateman <al...@openjdk.org> wrote:
>> 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 incrementally with one additional > commit since the last revision: > > Allowing linking without intrinsic stub, contributed-by: rehn I expected this change to fix the broken ARM32 port, but it doesn't work. # A fatal error has been detected by the Java Runtime Environment: # # Internal Error (templateInterpreterGenerator_arm.cpp:732), pid=27345, tid=27346 # Error: Unimplemented() # # JRE version: (19.0) (build ) # Java VM: OpenJDK Server VM (19-commit6f6486e9-adhoc.re.jdk, mixed mode, g1 gc, linux-arm) # Problematic frame: # V [libjvm.so+0xa14fe0] TemplateInterpreterGenerator::generate_Continuation_doYield_entry()+0x2c ------------- PR: https://git.openjdk.java.net/jdk/pull/8939
