1 /* 2 * Copyright (C) 2018 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_LIBARTBASE_BASE_MEMBARRIER_H_ 18 #define ART_LIBARTBASE_BASE_MEMBARRIER_H_ 19 20 namespace art { 21 // Command types for the linux membarrier system call. Different Linux installation may include 22 // different subsets of these commands (at the same codepoints). 23 // 24 // Hardcoding these values is temporary until bionic and prebuilts glibc have an up to date 25 // linux/membarrier.h. The order and values follow the current linux definitions. 26 enum class MembarrierCommand : int { 27 // MEMBARRIER_CMD_QUERY 28 kQuery = 0, 29 // MEMBARRIER_CMD_GLOBAL 30 kGlobal = (1 << 0), 31 // MEMBARRIER_CMD_GLOBAL_EXPEDITED 32 kGlobalExpedited = (1 << 1), 33 // MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED 34 kRegisterGlobalExpedited = (1 << 2), 35 // MEMBARRIER_CMD_PRIVATE_EXPEDITED 36 kPrivateExpedited = (1 << 3), 37 // MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED 38 kRegisterPrivateExpedited = (1 << 4), 39 // MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE 40 kPrivateExpeditedSyncCore = (1 << 5), 41 // MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE 42 kRegisterPrivateExpeditedSyncCore = (1 << 6) 43 }; 44 45 // Call membarrier(2) if available on platform and return result. This method can fail if the 46 // command is not supported by the kernel. The underlying system call is linux specific. 47 int membarrier(MembarrierCommand command); 48 49 } // namespace art 50 51 #endif // ART_LIBARTBASE_BASE_MEMBARRIER_H_ 52
