remove `NON_SCALAR_THREAD_ID` support

`NON_SCALAR_THREAD_ID` shows `pthread_t` is non-scalar (non-pointer)
and only s390x is known platform. However, the supporting code is
very complex and it is only used for deubg print information.

So this patch removes the support of `NON_SCALAR_THREAD_ID`
and make the code simple.

1 files changed, 1 insertions, 7 deletions

diff --git a/vm_dump.c b/vm_dump.c
index ebc9a03680..5c79e80352 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -1180,10 +1180,6 @@ rb_vm_bugreport(const void *ctx)
     }
 }
 
-#ifdef NON_SCALAR_THREAD_ID
-const char *ruby_fill_thread_id_string(rb_nativethread_id_t thid, rb_thread_id_string_t buf);
-#endif
-
 void
 rb_vmdebug_stack_dump_all_threads(void)
 {
@@ -1193,9 +1189,7 @@ rb_vmdebug_stack_dump_all_threads(void)
     // TODO: now it only shows current ractor
     ccan_list_for_each(&r->threads.set, th, lt_node) {
 #ifdef NON_SCALAR_THREAD_ID
-        rb_thread_id_string_t buf;
-	ruby_fill_thread_id_string(th->nt->thread_id, buf);
-	fprintf(stderr, "th: %p, native_id: %s\n", th, buf);
+	fprintf(stderr, "th: %p, native_id: N/A\n", th);
 #else
         fprintf(stderr, "th: %p, native_id: %p\n", (void *)th, (void *)(uintptr_t)th->nt->thread_id);
 #endif