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diff --git a/src/armadillo/include/armadillo_bits/mp_misc.hpp b/src/armadillo/include/armadillo_bits/mp_misc.hpp
new file mode 100644
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--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/mp_misc.hpp
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup mp_misc
+//! @{
+
+
+
+
+template<typename eT, const bool use_smaller_thresh = false>
+struct mp_gate
+  {
+  arma_inline
+  static
+  bool
+  eval(const uword n_elem)
+    {
+    #if defined(ARMA_USE_OPENMP)
+      {
+      const bool length_ok = (is_cx<eT>::yes || use_smaller_thresh) ? (n_elem >= (arma_config::mp_threshold/uword(2))) : (n_elem >= arma_config::mp_threshold);
+      
+      if(length_ok)
+        {
+        if(omp_in_parallel())  { return false; }
+        }
+      
+      return length_ok;
+      }
+    #else
+      {
+      arma_ignore(n_elem);
+      
+      return false;
+      }
+    #endif
+    }
+  };
+
+
+
+struct mp_thread_limit
+  {
+  arma_inline
+  static
+  int
+  get()
+    {
+    #if defined(ARMA_USE_OPENMP)
+      int n_threads = (std::min)(int(arma_config::mp_threads), int((std::max)(int(1), int(omp_get_max_threads()))));
+    #else
+      int n_threads = int(1);
+    #endif
+    
+    return n_threads;
+    }
+  
+  arma_inline
+  static
+  bool
+  in_parallel()
+    {
+    #if defined(ARMA_USE_OPENMP)
+      {
+      return bool(omp_in_parallel());
+      }
+    #else
+      {
+      return false;
+      }
+    #endif
+    }
+  };
+
+
+
+//! @}