| 1 | /*
|
|---|
| 2 | * Copyright (c) 2006 Jakub Jermar
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup generic
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #ifndef KERN_ATOMIC_H_
|
|---|
| 36 | #define KERN_ATOMIC_H_
|
|---|
| 37 |
|
|---|
| 38 | #include <stdbool.h>
|
|---|
| 39 | #include <typedefs.h>
|
|---|
| 40 | #include <stdatomic.h>
|
|---|
| 41 |
|
|---|
| 42 | // TODO: Remove.
|
|---|
| 43 | // Before <stdatomic.h> was available, there was only one atomic type
|
|---|
| 44 | // equivalent to atomic_size_t. This means that in some places, atomic_t can
|
|---|
| 45 | // be replaced with a more appropriate type (e.g. atomic_bool for flags or
|
|---|
| 46 | // a signed type for potentially signed values).
|
|---|
| 47 | // So atomic_t should be replaced with the most appropriate type on a case by
|
|---|
| 48 | // case basis, and after there are no more uses, remove this type.
|
|---|
| 49 | typedef atomic_size_t atomic_t;
|
|---|
| 50 |
|
|---|
| 51 | #define atomic_predec(val) \
|
|---|
| 52 | (atomic_fetch_sub((val), 1) - 1)
|
|---|
| 53 |
|
|---|
| 54 | #define atomic_preinc(val) \
|
|---|
| 55 | (atomic_fetch_add((val), 1) + 1)
|
|---|
| 56 |
|
|---|
| 57 | #define atomic_postdec(val) \
|
|---|
| 58 | atomic_fetch_sub((val), 1)
|
|---|
| 59 |
|
|---|
| 60 | #define atomic_postinc(val) \
|
|---|
| 61 | atomic_fetch_add((val), 1)
|
|---|
| 62 |
|
|---|
| 63 | #define atomic_dec(val) \
|
|---|
| 64 | ((void) atomic_fetch_sub(val, 1))
|
|---|
| 65 |
|
|---|
| 66 | #define atomic_inc(val) \
|
|---|
| 67 | ((void) atomic_fetch_add(val, 1))
|
|---|
| 68 |
|
|---|
| 69 | #define local_atomic_exchange(var_addr, new_val) \
|
|---|
| 70 | atomic_exchange_explicit(var_addr, new_val, memory_order_relaxed)
|
|---|
| 71 |
|
|---|
| 72 | #endif
|
|---|
| 73 |
|
|---|
| 74 | /** @}
|
|---|
| 75 | */
|
|---|
