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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_RUNTIME_GC_WEAK_ROOT_STATE_H_
     18 #define ART_RUNTIME_GC_WEAK_ROOT_STATE_H_
     19 
     20 #include <iosfwd>
     21 
     22 namespace art {
     23 namespace gc {
     24 
     25 enum WeakRootState {
     26   // Can read or add weak roots.
     27   kWeakRootStateNormal,
     28   // Need to wait until we can read weak roots.
     29   kWeakRootStateNoReadsOrWrites,
     30   // Need to mark new weak roots to make sure they don't get swept.
     31   // kWeakRootStateMarkNewRoots is currently unused but I was planning on using to allow adding new
     32   // weak roots during the CMS reference processing phase.
     33   kWeakRootStateMarkNewRoots,
     34 };
     35 
     36 std::ostream& operator<<(std::ostream& os, const WeakRootState&);
     37 
     38 }  // namespace gc
     39 }  // namespace art
     40 
     41 #endif  // ART_RUNTIME_GC_WEAK_ROOT_STATE_H_
     42