Integrated: JDK-8313656: assert(!JvmtiExport::can_support_virtual_threads()) with -XX:-DoJVMTIVirtualThreadTransitions

[Alex Menkov]

On Thu, 10 Aug 2023 01:45:47 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> The change fixes several issues with capability management:
> - handling can_support_virtual_threads capability. JvmtiExport::can_support_virtual_threads() should be set to true if we have one or more agent with can_support_virtual_threads capability;
> - JvmtiManageCapabilities (used by GetPotentialCapabilities/AddCapabilities/RelinquishCapabilities/GetCapabilities) is not thread safe;
> - SuspendAllVirtualThreads and ResumeAllVirtualThreads should check capability on the caller agent (and not JvmtiExport::can_support_virtual_threads()).
> 
> Testing: tier1..5

This pull request has now been integrated.

Changeset: b38bcae1
Author:    Alex Menkov <amenkov at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b38bcae1bad399d0a3ffc091835bf89140550bc2
Stats:     53 lines in 3 files changed: 47 ins; 0 del; 6 mod

8313656: assert(!JvmtiExport::can_support_virtual_threads()) with -XX:-DoJVMTIVirtualThreadTransitions

Reviewed-by: sspitsyn, lmesnik

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PR: https://git.openjdk.org/jdk/pull/15219