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mbed/platform/critical.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
boo

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annieluo2 0:d6c9b09b4042 1
annieluo2 0:d6c9b09b4042 2 /** \addtogroup platform */
annieluo2 0:d6c9b09b4042 3 /** @{*/
annieluo2 0:d6c9b09b4042 4 /*
annieluo2 0:d6c9b09b4042 5 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
annieluo2 0:d6c9b09b4042 6 * SPDX-License-Identifier: Apache-2.0
annieluo2 0:d6c9b09b4042 7 *
annieluo2 0:d6c9b09b4042 8 * Licensed under the Apache License, Version 2.0 (the "License"); you may
annieluo2 0:d6c9b09b4042 9 * not use this file except in compliance with the License.
annieluo2 0:d6c9b09b4042 10 * You may obtain a copy of the License at
annieluo2 0:d6c9b09b4042 11 *
annieluo2 0:d6c9b09b4042 12 * http://www.apache.org/licenses/LICENSE-2.0
annieluo2 0:d6c9b09b4042 13 *
annieluo2 0:d6c9b09b4042 14 * Unless required by applicable law or agreed to in writing, software
annieluo2 0:d6c9b09b4042 15 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
annieluo2 0:d6c9b09b4042 16 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
annieluo2 0:d6c9b09b4042 17 * See the License for the specific language governing permissions and
annieluo2 0:d6c9b09b4042 18 * limitations under the License.
annieluo2 0:d6c9b09b4042 19 */
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 #ifndef __MBED_UTIL_CRITICAL_H__
annieluo2 0:d6c9b09b4042 22 #define __MBED_UTIL_CRITICAL_H__
annieluo2 0:d6c9b09b4042 23
annieluo2 0:d6c9b09b4042 24 #include <stdbool.h>
annieluo2 0:d6c9b09b4042 25 #include <stdint.h>
annieluo2 0:d6c9b09b4042 26 #include <stddef.h>
annieluo2 0:d6c9b09b4042 27
annieluo2 0:d6c9b09b4042 28 #ifdef __cplusplus
annieluo2 0:d6c9b09b4042 29 extern "C" {
annieluo2 0:d6c9b09b4042 30 #endif
annieluo2 0:d6c9b09b4042 31
annieluo2 0:d6c9b09b4042 32
annieluo2 0:d6c9b09b4042 33 /** Determine the current interrupts enabled state
annieluo2 0:d6c9b09b4042 34 *
annieluo2 0:d6c9b09b4042 35 * This function can be called to determine whether or not interrupts are currently enabled.
annieluo2 0:d6c9b09b4042 36 * \note
annieluo2 0:d6c9b09b4042 37 * NOTE:
annieluo2 0:d6c9b09b4042 38 * This function works for both cortex-A and cortex-M, although the underlyng implementation
annieluo2 0:d6c9b09b4042 39 * differs.
annieluo2 0:d6c9b09b4042 40 * @return true if interrupts are enabled, false otherwise
annieluo2 0:d6c9b09b4042 41 */
annieluo2 0:d6c9b09b4042 42 bool core_util_are_interrupts_enabled(void);
annieluo2 0:d6c9b09b4042 43
annieluo2 0:d6c9b09b4042 44 /** Mark the start of a critical section
annieluo2 0:d6c9b09b4042 45 *
annieluo2 0:d6c9b09b4042 46 * This function should be called to mark the start of a critical section of code.
annieluo2 0:d6c9b09b4042 47 * \note
annieluo2 0:d6c9b09b4042 48 * NOTES:
annieluo2 0:d6c9b09b4042 49 * 1) The use of this style of critical section is targetted at C based implementations.
annieluo2 0:d6c9b09b4042 50 * 2) These critical sections can be nested.
annieluo2 0:d6c9b09b4042 51 * 3) The interrupt enable state on entry to the first critical section (of a nested set, or single
annieluo2 0:d6c9b09b4042 52 * section) will be preserved on exit from the section.
annieluo2 0:d6c9b09b4042 53 * 4) This implementation will currently only work on code running in privileged mode.
annieluo2 0:d6c9b09b4042 54 */
annieluo2 0:d6c9b09b4042 55 void core_util_critical_section_enter(void);
annieluo2 0:d6c9b09b4042 56
annieluo2 0:d6c9b09b4042 57 /** Mark the end of a critical section
annieluo2 0:d6c9b09b4042 58 *
annieluo2 0:d6c9b09b4042 59 * This function should be called to mark the end of a critical section of code.
annieluo2 0:d6c9b09b4042 60 * \note
annieluo2 0:d6c9b09b4042 61 * NOTES:
annieluo2 0:d6c9b09b4042 62 * 1) The use of this style of critical section is targetted at C based implementations.
annieluo2 0:d6c9b09b4042 63 * 2) These critical sections can be nested.
annieluo2 0:d6c9b09b4042 64 * 3) The interrupt enable state on entry to the first critical section (of a nested set, or single
annieluo2 0:d6c9b09b4042 65 * section) will be preserved on exit from the section.
annieluo2 0:d6c9b09b4042 66 * 4) This implementation will currently only work on code running in privileged mode.
annieluo2 0:d6c9b09b4042 67 */
annieluo2 0:d6c9b09b4042 68 void core_util_critical_section_exit(void);
annieluo2 0:d6c9b09b4042 69
annieluo2 0:d6c9b09b4042 70 /**
annieluo2 0:d6c9b09b4042 71 * Atomic compare and set. It compares the contents of a memory location to a
annieluo2 0:d6c9b09b4042 72 * given value and, only if they are the same, modifies the contents of that
annieluo2 0:d6c9b09b4042 73 * memory location to a given new value. This is done as a single atomic
annieluo2 0:d6c9b09b4042 74 * operation. The atomicity guarantees that the new value is calculated based on
annieluo2 0:d6c9b09b4042 75 * up-to-date information; if the value had been updated by another thread in
annieluo2 0:d6c9b09b4042 76 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
annieluo2 0:d6c9b09b4042 77 *
annieluo2 0:d6c9b09b4042 78 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
annieluo2 0:d6c9b09b4042 79 * you to the article on compare-and swap].
annieluo2 0:d6c9b09b4042 80 *
annieluo2 0:d6c9b09b4042 81 * @param ptr The target memory location.
annieluo2 0:d6c9b09b4042 82 * @param[in,out] expectedCurrentValue A pointer to some location holding the
annieluo2 0:d6c9b09b4042 83 * expected current value of the data being set atomically.
annieluo2 0:d6c9b09b4042 84 * The computed 'desiredValue' should be a function of this current value.
annieluo2 0:d6c9b09b4042 85 * @Note: This is an in-out parameter. In the
annieluo2 0:d6c9b09b4042 86 * failure case of atomic_cas (where the
annieluo2 0:d6c9b09b4042 87 * destination isn't set), the pointee of expectedCurrentValue is
annieluo2 0:d6c9b09b4042 88 * updated with the current value.
annieluo2 0:d6c9b09b4042 89 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
annieluo2 0:d6c9b09b4042 90 *
annieluo2 0:d6c9b09b4042 91 * @return true if the memory location was atomically
annieluo2 0:d6c9b09b4042 92 * updated with the desired value (after verifying
annieluo2 0:d6c9b09b4042 93 * that it contained the expectedCurrentValue),
annieluo2 0:d6c9b09b4042 94 * false otherwise. In the failure case,
annieluo2 0:d6c9b09b4042 95 * exepctedCurrentValue is updated with the new
annieluo2 0:d6c9b09b4042 96 * value of the target memory location.
annieluo2 0:d6c9b09b4042 97 *
annieluo2 0:d6c9b09b4042 98 * pseudocode:
annieluo2 0:d6c9b09b4042 99 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
annieluo2 0:d6c9b09b4042 100 * if *p != *old {
annieluo2 0:d6c9b09b4042 101 * *old = *p
annieluo2 0:d6c9b09b4042 102 * return false
annieluo2 0:d6c9b09b4042 103 * }
annieluo2 0:d6c9b09b4042 104 * *p = new
annieluo2 0:d6c9b09b4042 105 * return true
annieluo2 0:d6c9b09b4042 106 * }
annieluo2 0:d6c9b09b4042 107 *
annieluo2 0:d6c9b09b4042 108 * @Note: In the failure case (where the destination isn't set), the value
annieluo2 0:d6c9b09b4042 109 * pointed to by expectedCurrentValue is still updated with the current value.
annieluo2 0:d6c9b09b4042 110 * This property helps writing concise code for the following incr:
annieluo2 0:d6c9b09b4042 111 *
annieluo2 0:d6c9b09b4042 112 * function incr(p : pointer to int, a : int) returns int {
annieluo2 0:d6c9b09b4042 113 * done = false
annieluo2 0:d6c9b09b4042 114 * value = *p // This fetch operation need not be atomic.
annieluo2 0:d6c9b09b4042 115 * while not done {
annieluo2 0:d6c9b09b4042 116 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
annieluo2 0:d6c9b09b4042 117 * }
annieluo2 0:d6c9b09b4042 118 * return value + a
annieluo2 0:d6c9b09b4042 119 * }
annieluo2 0:d6c9b09b4042 120 */
annieluo2 0:d6c9b09b4042 121 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue);
annieluo2 0:d6c9b09b4042 122
annieluo2 0:d6c9b09b4042 123 /**
annieluo2 0:d6c9b09b4042 124 * Atomic compare and set. It compares the contents of a memory location to a
annieluo2 0:d6c9b09b4042 125 * given value and, only if they are the same, modifies the contents of that
annieluo2 0:d6c9b09b4042 126 * memory location to a given new value. This is done as a single atomic
annieluo2 0:d6c9b09b4042 127 * operation. The atomicity guarantees that the new value is calculated based on
annieluo2 0:d6c9b09b4042 128 * up-to-date information; if the value had been updated by another thread in
annieluo2 0:d6c9b09b4042 129 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
annieluo2 0:d6c9b09b4042 130 *
annieluo2 0:d6c9b09b4042 131 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
annieluo2 0:d6c9b09b4042 132 * you to the article on compare-and swap].
annieluo2 0:d6c9b09b4042 133 *
annieluo2 0:d6c9b09b4042 134 * @param ptr The target memory location.
annieluo2 0:d6c9b09b4042 135 * @param[in,out] expectedCurrentValue A pointer to some location holding the
annieluo2 0:d6c9b09b4042 136 * expected current value of the data being set atomically.
annieluo2 0:d6c9b09b4042 137 * The computed 'desiredValue' should be a function of this current value.
annieluo2 0:d6c9b09b4042 138 * @Note: This is an in-out parameter. In the
annieluo2 0:d6c9b09b4042 139 * failure case of atomic_cas (where the
annieluo2 0:d6c9b09b4042 140 * destination isn't set), the pointee of expectedCurrentValue is
annieluo2 0:d6c9b09b4042 141 * updated with the current value.
annieluo2 0:d6c9b09b4042 142 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
annieluo2 0:d6c9b09b4042 143 *
annieluo2 0:d6c9b09b4042 144 * @return true if the memory location was atomically
annieluo2 0:d6c9b09b4042 145 * updated with the desired value (after verifying
annieluo2 0:d6c9b09b4042 146 * that it contained the expectedCurrentValue),
annieluo2 0:d6c9b09b4042 147 * false otherwise. In the failure case,
annieluo2 0:d6c9b09b4042 148 * exepctedCurrentValue is updated with the new
annieluo2 0:d6c9b09b4042 149 * value of the target memory location.
annieluo2 0:d6c9b09b4042 150 *
annieluo2 0:d6c9b09b4042 151 * pseudocode:
annieluo2 0:d6c9b09b4042 152 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
annieluo2 0:d6c9b09b4042 153 * if *p != *old {
annieluo2 0:d6c9b09b4042 154 * *old = *p
annieluo2 0:d6c9b09b4042 155 * return false
annieluo2 0:d6c9b09b4042 156 * }
annieluo2 0:d6c9b09b4042 157 * *p = new
annieluo2 0:d6c9b09b4042 158 * return true
annieluo2 0:d6c9b09b4042 159 * }
annieluo2 0:d6c9b09b4042 160 *
annieluo2 0:d6c9b09b4042 161 * @Note: In the failure case (where the destination isn't set), the value
annieluo2 0:d6c9b09b4042 162 * pointed to by expectedCurrentValue is still updated with the current value.
annieluo2 0:d6c9b09b4042 163 * This property helps writing concise code for the following incr:
annieluo2 0:d6c9b09b4042 164 *
annieluo2 0:d6c9b09b4042 165 * function incr(p : pointer to int, a : int) returns int {
annieluo2 0:d6c9b09b4042 166 * done = false
annieluo2 0:d6c9b09b4042 167 * value = *p // This fetch operation need not be atomic.
annieluo2 0:d6c9b09b4042 168 * while not done {
annieluo2 0:d6c9b09b4042 169 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
annieluo2 0:d6c9b09b4042 170 * }
annieluo2 0:d6c9b09b4042 171 * return value + a
annieluo2 0:d6c9b09b4042 172 * }
annieluo2 0:d6c9b09b4042 173 */
annieluo2 0:d6c9b09b4042 174 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue);
annieluo2 0:d6c9b09b4042 175
annieluo2 0:d6c9b09b4042 176 /**
annieluo2 0:d6c9b09b4042 177 * Atomic compare and set. It compares the contents of a memory location to a
annieluo2 0:d6c9b09b4042 178 * given value and, only if they are the same, modifies the contents of that
annieluo2 0:d6c9b09b4042 179 * memory location to a given new value. This is done as a single atomic
annieluo2 0:d6c9b09b4042 180 * operation. The atomicity guarantees that the new value is calculated based on
annieluo2 0:d6c9b09b4042 181 * up-to-date information; if the value had been updated by another thread in
annieluo2 0:d6c9b09b4042 182 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
annieluo2 0:d6c9b09b4042 183 *
annieluo2 0:d6c9b09b4042 184 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
annieluo2 0:d6c9b09b4042 185 * you to the article on compare-and swap].
annieluo2 0:d6c9b09b4042 186 *
annieluo2 0:d6c9b09b4042 187 * @param ptr The target memory location.
annieluo2 0:d6c9b09b4042 188 * @param[in,out] expectedCurrentValue A pointer to some location holding the
annieluo2 0:d6c9b09b4042 189 * expected current value of the data being set atomically.
annieluo2 0:d6c9b09b4042 190 * The computed 'desiredValue' should be a function of this current value.
annieluo2 0:d6c9b09b4042 191 * @Note: This is an in-out parameter. In the
annieluo2 0:d6c9b09b4042 192 * failure case of atomic_cas (where the
annieluo2 0:d6c9b09b4042 193 * destination isn't set), the pointee of expectedCurrentValue is
annieluo2 0:d6c9b09b4042 194 * updated with the current value.
annieluo2 0:d6c9b09b4042 195 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
annieluo2 0:d6c9b09b4042 196 *
annieluo2 0:d6c9b09b4042 197 * @return true if the memory location was atomically
annieluo2 0:d6c9b09b4042 198 * updated with the desired value (after verifying
annieluo2 0:d6c9b09b4042 199 * that it contained the expectedCurrentValue),
annieluo2 0:d6c9b09b4042 200 * false otherwise. In the failure case,
annieluo2 0:d6c9b09b4042 201 * exepctedCurrentValue is updated with the new
annieluo2 0:d6c9b09b4042 202 * value of the target memory location.
annieluo2 0:d6c9b09b4042 203 *
annieluo2 0:d6c9b09b4042 204 * pseudocode:
annieluo2 0:d6c9b09b4042 205 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
annieluo2 0:d6c9b09b4042 206 * if *p != *old {
annieluo2 0:d6c9b09b4042 207 * *old = *p
annieluo2 0:d6c9b09b4042 208 * return false
annieluo2 0:d6c9b09b4042 209 * }
annieluo2 0:d6c9b09b4042 210 * *p = new
annieluo2 0:d6c9b09b4042 211 * return true
annieluo2 0:d6c9b09b4042 212 * }
annieluo2 0:d6c9b09b4042 213 *
annieluo2 0:d6c9b09b4042 214 * @Note: In the failure case (where the destination isn't set), the value
annieluo2 0:d6c9b09b4042 215 * pointed to by expectedCurrentValue is still updated with the current value.
annieluo2 0:d6c9b09b4042 216 * This property helps writing concise code for the following incr:
annieluo2 0:d6c9b09b4042 217 *
annieluo2 0:d6c9b09b4042 218 * function incr(p : pointer to int, a : int) returns int {
annieluo2 0:d6c9b09b4042 219 * done = false
annieluo2 0:d6c9b09b4042 220 * value = *p // This fetch operation need not be atomic.
annieluo2 0:d6c9b09b4042 221 * while not done {
annieluo2 0:d6c9b09b4042 222 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
annieluo2 0:d6c9b09b4042 223 * }
annieluo2 0:d6c9b09b4042 224 * return value + a
annieluo2 0:d6c9b09b4042 225 * }
annieluo2 0:d6c9b09b4042 226 */
annieluo2 0:d6c9b09b4042 227 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue);
annieluo2 0:d6c9b09b4042 228
annieluo2 0:d6c9b09b4042 229 /**
annieluo2 0:d6c9b09b4042 230 * Atomic compare and set. It compares the contents of a memory location to a
annieluo2 0:d6c9b09b4042 231 * given value and, only if they are the same, modifies the contents of that
annieluo2 0:d6c9b09b4042 232 * memory location to a given new value. This is done as a single atomic
annieluo2 0:d6c9b09b4042 233 * operation. The atomicity guarantees that the new value is calculated based on
annieluo2 0:d6c9b09b4042 234 * up-to-date information; if the value had been updated by another thread in
annieluo2 0:d6c9b09b4042 235 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
annieluo2 0:d6c9b09b4042 236 *
annieluo2 0:d6c9b09b4042 237 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
annieluo2 0:d6c9b09b4042 238 * you to the article on compare-and swap].
annieluo2 0:d6c9b09b4042 239 *
annieluo2 0:d6c9b09b4042 240 * @param ptr The target memory location.
annieluo2 0:d6c9b09b4042 241 * @param[in,out] expectedCurrentValue A pointer to some location holding the
annieluo2 0:d6c9b09b4042 242 * expected current value of the data being set atomically.
annieluo2 0:d6c9b09b4042 243 * The computed 'desiredValue' should be a function of this current value.
annieluo2 0:d6c9b09b4042 244 * @Note: This is an in-out parameter. In the
annieluo2 0:d6c9b09b4042 245 * failure case of atomic_cas (where the
annieluo2 0:d6c9b09b4042 246 * destination isn't set), the pointee of expectedCurrentValue is
annieluo2 0:d6c9b09b4042 247 * updated with the current value.
annieluo2 0:d6c9b09b4042 248 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
annieluo2 0:d6c9b09b4042 249 *
annieluo2 0:d6c9b09b4042 250 * @return true if the memory location was atomically
annieluo2 0:d6c9b09b4042 251 * updated with the desired value (after verifying
annieluo2 0:d6c9b09b4042 252 * that it contained the expectedCurrentValue),
annieluo2 0:d6c9b09b4042 253 * false otherwise. In the failure case,
annieluo2 0:d6c9b09b4042 254 * exepctedCurrentValue is updated with the new
annieluo2 0:d6c9b09b4042 255 * value of the target memory location.
annieluo2 0:d6c9b09b4042 256 *
annieluo2 0:d6c9b09b4042 257 * pseudocode:
annieluo2 0:d6c9b09b4042 258 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
annieluo2 0:d6c9b09b4042 259 * if *p != *old {
annieluo2 0:d6c9b09b4042 260 * *old = *p
annieluo2 0:d6c9b09b4042 261 * return false
annieluo2 0:d6c9b09b4042 262 * }
annieluo2 0:d6c9b09b4042 263 * *p = new
annieluo2 0:d6c9b09b4042 264 * return true
annieluo2 0:d6c9b09b4042 265 * }
annieluo2 0:d6c9b09b4042 266 *
annieluo2 0:d6c9b09b4042 267 * @Note: In the failure case (where the destination isn't set), the value
annieluo2 0:d6c9b09b4042 268 * pointed to by expectedCurrentValue is still updated with the current value.
annieluo2 0:d6c9b09b4042 269 * This property helps writing concise code for the following incr:
annieluo2 0:d6c9b09b4042 270 *
annieluo2 0:d6c9b09b4042 271 * function incr(p : pointer to int, a : int) returns int {
annieluo2 0:d6c9b09b4042 272 * done = false
annieluo2 0:d6c9b09b4042 273 * value = *p // This fetch operation need not be atomic.
annieluo2 0:d6c9b09b4042 274 * while not done {
annieluo2 0:d6c9b09b4042 275 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
annieluo2 0:d6c9b09b4042 276 * }
annieluo2 0:d6c9b09b4042 277 * return value + a
annieluo2 0:d6c9b09b4042 278 * }
annieluo2 0:d6c9b09b4042 279 */
annieluo2 0:d6c9b09b4042 280 bool core_util_atomic_cas_ptr(void **ptr, void **expectedCurrentValue, void *desiredValue);
annieluo2 0:d6c9b09b4042 281
annieluo2 0:d6c9b09b4042 282 /**
annieluo2 0:d6c9b09b4042 283 * Atomic increment.
annieluo2 0:d6c9b09b4042 284 * @param valuePtr Target memory location being incremented.
annieluo2 0:d6c9b09b4042 285 * @param delta The amount being incremented.
annieluo2 0:d6c9b09b4042 286 * @return The new incremented value.
annieluo2 0:d6c9b09b4042 287 */
annieluo2 0:d6c9b09b4042 288 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta);
annieluo2 0:d6c9b09b4042 289
annieluo2 0:d6c9b09b4042 290 /**
annieluo2 0:d6c9b09b4042 291 * Atomic increment.
annieluo2 0:d6c9b09b4042 292 * @param valuePtr Target memory location being incremented.
annieluo2 0:d6c9b09b4042 293 * @param delta The amount being incremented.
annieluo2 0:d6c9b09b4042 294 * @return The new incremented value.
annieluo2 0:d6c9b09b4042 295 */
annieluo2 0:d6c9b09b4042 296 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta);
annieluo2 0:d6c9b09b4042 297
annieluo2 0:d6c9b09b4042 298 /**
annieluo2 0:d6c9b09b4042 299 * Atomic increment.
annieluo2 0:d6c9b09b4042 300 * @param valuePtr Target memory location being incremented.
annieluo2 0:d6c9b09b4042 301 * @param delta The amount being incremented.
annieluo2 0:d6c9b09b4042 302 * @return The new incremented value.
annieluo2 0:d6c9b09b4042 303 */
annieluo2 0:d6c9b09b4042 304 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta);
annieluo2 0:d6c9b09b4042 305
annieluo2 0:d6c9b09b4042 306 /**
annieluo2 0:d6c9b09b4042 307 * Atomic increment.
annieluo2 0:d6c9b09b4042 308 * @param valuePtr Target memory location being incremented.
annieluo2 0:d6c9b09b4042 309 * @param delta The amount being incremented in bytes.
annieluo2 0:d6c9b09b4042 310 * @return The new incremented value.
annieluo2 0:d6c9b09b4042 311 *
annieluo2 0:d6c9b09b4042 312 * @note The type of the pointer argument is not taken into account
annieluo2 0:d6c9b09b4042 313 * and the pointer is incremented by bytes.
annieluo2 0:d6c9b09b4042 314 */
annieluo2 0:d6c9b09b4042 315 void *core_util_atomic_incr_ptr(void **valuePtr, ptrdiff_t delta);
annieluo2 0:d6c9b09b4042 316
annieluo2 0:d6c9b09b4042 317 /**
annieluo2 0:d6c9b09b4042 318 * Atomic decrement.
annieluo2 0:d6c9b09b4042 319 * @param valuePtr Target memory location being decremented.
annieluo2 0:d6c9b09b4042 320 * @param delta The amount being decremented.
annieluo2 0:d6c9b09b4042 321 * @return The new decremented value.
annieluo2 0:d6c9b09b4042 322 */
annieluo2 0:d6c9b09b4042 323 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta);
annieluo2 0:d6c9b09b4042 324
annieluo2 0:d6c9b09b4042 325 /**
annieluo2 0:d6c9b09b4042 326 * Atomic decrement.
annieluo2 0:d6c9b09b4042 327 * @param valuePtr Target memory location being decremented.
annieluo2 0:d6c9b09b4042 328 * @param delta The amount being decremented.
annieluo2 0:d6c9b09b4042 329 * @return The new decremented value.
annieluo2 0:d6c9b09b4042 330 */
annieluo2 0:d6c9b09b4042 331 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta);
annieluo2 0:d6c9b09b4042 332
annieluo2 0:d6c9b09b4042 333 /**
annieluo2 0:d6c9b09b4042 334 * Atomic decrement.
annieluo2 0:d6c9b09b4042 335 * @param valuePtr Target memory location being decremented.
annieluo2 0:d6c9b09b4042 336 * @param delta The amount being decremented.
annieluo2 0:d6c9b09b4042 337 * @return The new decremented value.
annieluo2 0:d6c9b09b4042 338 */
annieluo2 0:d6c9b09b4042 339 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta);
annieluo2 0:d6c9b09b4042 340
annieluo2 0:d6c9b09b4042 341 /**
annieluo2 0:d6c9b09b4042 342 * Atomic decrement.
annieluo2 0:d6c9b09b4042 343 * @param valuePtr Target memory location being decremented.
annieluo2 0:d6c9b09b4042 344 * @param delta The amount being decremented in bytes.
annieluo2 0:d6c9b09b4042 345 * @return The new decremented value.
annieluo2 0:d6c9b09b4042 346 *
annieluo2 0:d6c9b09b4042 347 * @note The type of the pointer argument is not taken into account
annieluo2 0:d6c9b09b4042 348 * and the pointer is decremented by bytes
annieluo2 0:d6c9b09b4042 349 */
annieluo2 0:d6c9b09b4042 350 void *core_util_atomic_decr_ptr(void **valuePtr, ptrdiff_t delta);
annieluo2 0:d6c9b09b4042 351
annieluo2 0:d6c9b09b4042 352 #ifdef __cplusplus
annieluo2 0:d6c9b09b4042 353 } // extern "C"
annieluo2 0:d6c9b09b4042 354 #endif
annieluo2 0:d6c9b09b4042 355
annieluo2 0:d6c9b09b4042 356
annieluo2 0:d6c9b09b4042 357 #endif // __MBED_UTIL_CRITICAL_H__
annieluo2 0:d6c9b09b4042 358
annieluo2 0:d6c9b09b4042 359 /** @}*/