Enrico Fraccaroli
23 lines
780 B
C
23 lines
780 B
C
/// MentOS, The Mentoring Operating system project
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/// @file compiler.h
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/// @brief
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#pragma once
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/*
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* Prevent the compiler from merging or refetching reads or writes.
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*
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* Ensuring that the compiler does not fold, spindle, or otherwise
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* mutilate accesses that either do not require ordering or that interact
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* with an explicit memory barrier or atomic instruction that provides the
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* required ordering.
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*/
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/// @brief Assign the value to the given variable.
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#define WRITE_ONCE(var, val) (*((volatile typeof(val) *)(&(var))) = (val))
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/// @brief Read the value from the given variable.
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#define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))
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