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Last change
on this file since 9bfa8c8 was d7f7a4a, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 3 years ago |
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Replace some license headers with SPDX identifier
Headers are replaced using tools/transorm-copyright.sh only
when it can be matched verbatim with the license header used
throughout most of the codebase.
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-
Property mode
set to
100644
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File size:
767 bytes
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| [11904316] | 1 | /*
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| [d7f7a4a] | 2 | * SPDX-FileCopyrightText: 2012 Adam Hraska
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| [11904316] | 3 | *
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| [d7f7a4a] | 4 | * SPDX-License-Identifier: BSD-3-Clause
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| [11904316] | 5 | */
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| 6 |
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| 7 | /** @addtogroup libc
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| 8 | * @{
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| 9 | */
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| 10 | /** @file
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| 11 | */
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| 12 |
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| [4805495] | 13 | #ifndef _LIBC_COMPILER_BARRIER_H_
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| 14 | #define _LIBC_COMPILER_BARRIER_H_
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| [11904316] | 15 |
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| [d51cca8] | 16 | #include <stdatomic.h>
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| [05882233] | 17 |
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| [d51cca8] | 18 | static inline void compiler_barrier(void)
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| 19 | {
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| 20 | atomic_signal_fence(memory_order_seq_cst);
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| 21 | }
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| 22 |
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| 23 | static inline void memory_barrier(void)
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| 24 | {
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| 25 | atomic_thread_fence(memory_order_seq_cst);
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| 26 | }
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| 27 |
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| 28 | static inline void read_barrier(void)
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| 29 | {
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| 30 | atomic_thread_fence(memory_order_acquire);
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| 31 | }
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| 32 |
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| 33 | static inline void write_barrier(void)
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| 34 | {
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| 35 | atomic_thread_fence(memory_order_release);
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| 36 | }
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| [11904316] | 37 |
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| 38 | /** Forces the compiler to access (ie load/store) the variable only once. */
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| 39 | #define ACCESS_ONCE(var) (*((volatile typeof(var)*)&(var)))
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| 40 |
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| [4805495] | 41 | #endif /* _LIBC_COMPILER_BARRIER_H_ */
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