KVM: selftests: Add helper APIs to cancel+join pthreads

Deduplicate test code that does cancel()+join() on pthreads by adding a
collection of syscall wrappers.  The tests that asynchronously cancel
pthreads, i.e. use PTHREAD_CANCEL_ASYNCHRONOUS, are particularly ugly,
especially since it's not immediately obvious why those tests assert on
the thread being CANCELED, whereas others do not.

No functional change intended.

Link: https://patch.msgid.link/20260731195612.2697986-11-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions