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52 lines
2.0 KiB
52 lines
2.0 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBARTBASE_BASE_MEMBARRIER_H_
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#define ART_LIBARTBASE_BASE_MEMBARRIER_H_
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namespace art {
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// Command types for the linux membarrier system call. Different Linux installation may include
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// different subsets of these commands (at the same codepoints).
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//
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// Hardcoding these values is temporary until bionic and prebuilts glibc have an up to date
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// linux/membarrier.h. The order and values follow the current linux definitions.
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enum class MembarrierCommand : int {
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// MEMBARRIER_CMD_QUERY
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kQuery = 0,
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// MEMBARRIER_CMD_GLOBAL
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kGlobal = (1 << 0),
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// MEMBARRIER_CMD_GLOBAL_EXPEDITED
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kGlobalExpedited = (1 << 1),
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// MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED
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kRegisterGlobalExpedited = (1 << 2),
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// MEMBARRIER_CMD_PRIVATE_EXPEDITED
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kPrivateExpedited = (1 << 3),
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// MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED
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kRegisterPrivateExpedited = (1 << 4),
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// MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE
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kPrivateExpeditedSyncCore = (1 << 5),
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// MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE
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kRegisterPrivateExpeditedSyncCore = (1 << 6)
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};
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// Call membarrier(2) if available on platform and return result. This method can fail if the
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// command is not supported by the kernel. The underlying system call is linux specific.
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int membarrier(MembarrierCommand command);
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} // namespace art
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#endif // ART_LIBARTBASE_BASE_MEMBARRIER_H_
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