[Scheduler] Add SGLANG_FORCE_COARSE_WAR_BARRIER opt-in for a whole-forward WAR barrier (#29353)

test/registered/unit/mem_cache/test_unified_radix_cache_unittest.py

@@ -932,6 +932,7 @@ class UnifiedRadixCacheSuite:
         req.last_node = cache.root_node
         req.cache_protected_len = 0
         req.swa_uuid_for_lock = None
+        req.swa_prefix_lock_released = True
         req.extra_key = None
         req.full_untruncated_fill_ids = array("q", tokens)
         req.set_extend_range(
@@ -975,6 +976,7 @@ class UnifiedRadixCacheSuite:
         self.assertGreater(len(req.prefix_indices), 0)
         self.assertEqual(req.cache_protected_len, len(req.prefix_indices))
         self.assertIsNotNone(req.last_node)
+        self.assertFalse(req.swa_prefix_lock_released)
 
         cache.dec_lock_ref(
             req.last_node,