pre-emptive thread register cache updating on ctrl thread - cache reading/updating on ui thread should always be allowed to gracefully fail, since it is literally impossible on linux, but we can always rely on the ctrl thread to pipe the right thing through eventually.

src/ctrl/ctrl_core.c

@@ -3867,6 +3867,22 @@ ctrl_thread__entry_point(void *p)
     ins_atomic_u64_inc_eval(&ctrl_state->mem_gen);
     ins_atomic_u64_inc_eval(&ctrl_state->reg_gen);
     
+    //- rjf: update thread register cache
+    ProfScope("update thread register cache")
+    {
+      CTRL_EntityCtx *entity_ctx = &ctrl_state->ctrl_thread_entity_store->ctx;
+      CTRL_EntityArray threads = ctrl_entity_array_from_kind(entity_ctx, CTRL_EntityKind_Thread);
+      REGS_RegBlockX64 *blocks = push_array(scratch.arena, REGS_RegBlockX64, threads.count);
+      {
+        for EachIndex(idx, threads.count)
+        {
+          Temp scratch = scratch_begin(0, 0);
+          ctrl_reg_block_from_thread(scratch.arena, entity_ctx, threads.v[idx]->handle);
+          scratch_end(scratch);
+        }
+      }
+    }
+    
     //- rjf: gather & output logs
     ctrl_thread__end_and_flush_log();
   }