[calbebop]

What

pthread_attr_get_np leaves the destination attribute's previous scheduling policy unchanged, and scePthreadAttrGet always reports FIFO. Both now copy the thread's stored policy, so attribute queries agree with explicit or inherited creation and later successful scheduling changes.

The regression queries both exports after RR creation and RR → FIFO → RR changes, preloading the destination with the opposite policy before each query. The policy snapshot follows FreeBSD 11.4's attribute query and scheduling update. The debt entry records that applying the same rule to the SCE query has not been measured on PS5 hardware.

Tested

Ubuntu 24.04, GCC 13.3, x86-64, entirely inside Docker Desktop.

• The new regression fails against unchanged production code at dacd78525. A diagnostic run records incorrect policies in 10 of 12 queries.
• The corrected regression passes all 12 policy assertions, covering both query exports, both creation modes, and both runtime setter exports.
• Updated onto main a0f5916a2; all production libraries and the relinker build successfully.
• All 23 selected pthread/scheduling and patched-library-loading checks pass: ctest -R '^(guest_pthread_.*|guest_available_cpumask|guest_sched_priority|patched_libraries)$'.
• python3 tools/check_conventions.py --base origin/main and git diff --check pass.

No Windows, PS5 hardware, or title run was performed. This corrects reported guest metadata; it does not change host scheduling. The entire project test suite was not run.

Checklist

• Based on current main; no other open PR implements this policy-query correction (checked the open PR list and adjacent feat(libkernel): implement pthread_setaffinity_np #4514, fix(libkernel): keep a finished Windows thread's stack until it is joined or detached #4563, fix(libkernel): inherit floating-point environment on Windows threads #4981, and fix(libkernel): give an inheriting thread its creator's priority #5230 diffs)
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw; no silent stubs added
• No notes, investigation .md files or images added to the repository
• New third-party code is a submodule built from source: no new dependency
• Generic behaviour, not specific to one title
• Depends on: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
#4953	docs/dev/debt/libkernel.md L13
#5537	docs/dev/debt/libkernel.md L13
#5553	docs/dev/debt/libkernel.md L13