ext/threads/shared/t/shared_attr.t Test :shared attribute
ext/threads/shared/t/sv_refs.t thread shared variables
ext/threads/shared/t/sv_simple.t thread shared variables
+ext/threads/shared/t/waithires.t Test sub-second cond_timedwait
ext/threads/shared/t/wait.t Test cond_wait and cond_timedwait
ext/threads/t/basic.t ithreads
ext/threads/t/blocks.t Test threads in special blocks