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platform/mbed_critical.h@167:1657b442184c, 2017-06-29 (annotated)

Committer:
thedo
Date:
Thu Jun 29 11:01:39 2017 +0000
Revision:
167:1657b442184c
Opencv 3.1 project on GR-PEACH board, 4 apps

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thedo 167:1657b442184c 1
thedo 167:1657b442184c 2 /** \addtogroup platform */
thedo 167:1657b442184c 3 /** @{*/
thedo 167:1657b442184c 4 /*
thedo 167:1657b442184c 5 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
thedo 167:1657b442184c 6 * SPDX-License-Identifier: Apache-2.0
thedo 167:1657b442184c 7 *
thedo 167:1657b442184c 8 * Licensed under the Apache License, Version 2.0 (the "License"); you may
thedo 167:1657b442184c 9 * not use this file except in compliance with the License.
thedo 167:1657b442184c 10 * You may obtain a copy of the License at
thedo 167:1657b442184c 11 *
thedo 167:1657b442184c 12 * http://www.apache.org/licenses/LICENSE-2.0
thedo 167:1657b442184c 13 *
thedo 167:1657b442184c 14 * Unless required by applicable law or agreed to in writing, software
thedo 167:1657b442184c 15 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
thedo 167:1657b442184c 16 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
thedo 167:1657b442184c 17 * See the License for the specific language governing permissions and
thedo 167:1657b442184c 18 * limitations under the License.
thedo 167:1657b442184c 19 */
thedo 167:1657b442184c 20
thedo 167:1657b442184c 21 #ifndef __MBED_UTIL_CRITICAL_H__
thedo 167:1657b442184c 22 #define __MBED_UTIL_CRITICAL_H__
thedo 167:1657b442184c 23
thedo 167:1657b442184c 24 #include <stdbool.h>
thedo 167:1657b442184c 25 #include <stdint.h>
thedo 167:1657b442184c 26 #include <stddef.h>
thedo 167:1657b442184c 27
thedo 167:1657b442184c 28 #ifdef __cplusplus
thedo 167:1657b442184c 29 extern "C" {
thedo 167:1657b442184c 30 #endif
thedo 167:1657b442184c 31
thedo 167:1657b442184c 32
thedo 167:1657b442184c 33 /** Determine the current interrupts enabled state
thedo 167:1657b442184c 34 *
thedo 167:1657b442184c 35 * This function can be called to determine whether or not interrupts are currently enabled.
thedo 167:1657b442184c 36 * @note
thedo 167:1657b442184c 37 * NOTE:
thedo 167:1657b442184c 38 * This function works for both cortex-A and cortex-M, although the underlyng implementation
thedo 167:1657b442184c 39 * differs.
thedo 167:1657b442184c 40 * @return true if interrupts are enabled, false otherwise
thedo 167:1657b442184c 41 */
thedo 167:1657b442184c 42 bool core_util_are_interrupts_enabled(void);
thedo 167:1657b442184c 43
thedo 167:1657b442184c 44 /** Determine if this code is executing from an interrupt
thedo 167:1657b442184c 45 *
thedo 167:1657b442184c 46 * This function can be called to determine if the code is running on interrupt context.
thedo 167:1657b442184c 47 * @note
thedo 167:1657b442184c 48 * NOTE:
thedo 167:1657b442184c 49 * This function works for both cortex-A and cortex-M, although the underlyng implementation
thedo 167:1657b442184c 50 * differs.
thedo 167:1657b442184c 51 * @return true if in an isr, false otherwise
thedo 167:1657b442184c 52 */
thedo 167:1657b442184c 53 bool core_util_is_isr_active(void);
thedo 167:1657b442184c 54
thedo 167:1657b442184c 55 /** Mark the start of a critical section
thedo 167:1657b442184c 56 *
thedo 167:1657b442184c 57 * This function should be called to mark the start of a critical section of code.
thedo 167:1657b442184c 58 * @note
thedo 167:1657b442184c 59 * NOTES:
thedo 167:1657b442184c 60 * 1) The use of this style of critical section is targetted at C based implementations.
thedo 167:1657b442184c 61 * 2) These critical sections can be nested.
thedo 167:1657b442184c 62 * 3) The interrupt enable state on entry to the first critical section (of a nested set, or single
thedo 167:1657b442184c 63 * section) will be preserved on exit from the section.
thedo 167:1657b442184c 64 * 4) This implementation will currently only work on code running in privileged mode.
thedo 167:1657b442184c 65 */
thedo 167:1657b442184c 66 void core_util_critical_section_enter(void);
thedo 167:1657b442184c 67
thedo 167:1657b442184c 68 /** Mark the end of a critical section
thedo 167:1657b442184c 69 *
thedo 167:1657b442184c 70 * This function should be called to mark the end of a critical section of code.
thedo 167:1657b442184c 71 * @note
thedo 167:1657b442184c 72 * NOTES:
thedo 167:1657b442184c 73 * 1) The use of this style of critical section is targetted at C based implementations.
thedo 167:1657b442184c 74 * 2) These critical sections can be nested.
thedo 167:1657b442184c 75 * 3) The interrupt enable state on entry to the first critical section (of a nested set, or single
thedo 167:1657b442184c 76 * section) will be preserved on exit from the section.
thedo 167:1657b442184c 77 * 4) This implementation will currently only work on code running in privileged mode.
thedo 167:1657b442184c 78 */
thedo 167:1657b442184c 79 void core_util_critical_section_exit(void);
thedo 167:1657b442184c 80
thedo 167:1657b442184c 81 /**
thedo 167:1657b442184c 82 * Atomic compare and set. It compares the contents of a memory location to a
thedo 167:1657b442184c 83 * given value and, only if they are the same, modifies the contents of that
thedo 167:1657b442184c 84 * memory location to a given new value. This is done as a single atomic
thedo 167:1657b442184c 85 * operation. The atomicity guarantees that the new value is calculated based on
thedo 167:1657b442184c 86 * up-to-date information; if the value had been updated by another thread in
thedo 167:1657b442184c 87 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
thedo 167:1657b442184c 88 *
thedo 167:1657b442184c 89 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
thedo 167:1657b442184c 90 * you to the article on compare-and swap].
thedo 167:1657b442184c 91 *
thedo 167:1657b442184c 92 * @param ptr The target memory location.
thedo 167:1657b442184c 93 * @param[in,out] expectedCurrentValue A pointer to some location holding the
thedo 167:1657b442184c 94 * expected current value of the data being set atomically.
thedo 167:1657b442184c 95 * The computed 'desiredValue' should be a function of this current value.
thedo 167:1657b442184c 96 * @note: This is an in-out parameter. In the
thedo 167:1657b442184c 97 * failure case of atomic_cas (where the
thedo 167:1657b442184c 98 * destination isn't set), the pointee of expectedCurrentValue is
thedo 167:1657b442184c 99 * updated with the current value.
thedo 167:1657b442184c 100 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
thedo 167:1657b442184c 101 *
thedo 167:1657b442184c 102 * @return true if the memory location was atomically
thedo 167:1657b442184c 103 * updated with the desired value (after verifying
thedo 167:1657b442184c 104 * that it contained the expectedCurrentValue),
thedo 167:1657b442184c 105 * false otherwise. In the failure case,
thedo 167:1657b442184c 106 * exepctedCurrentValue is updated with the new
thedo 167:1657b442184c 107 * value of the target memory location.
thedo 167:1657b442184c 108 *
thedo 167:1657b442184c 109 * pseudocode:
thedo 167:1657b442184c 110 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
thedo 167:1657b442184c 111 * if *p != *old {
thedo 167:1657b442184c 112 * *old = *p
thedo 167:1657b442184c 113 * return false
thedo 167:1657b442184c 114 * }
thedo 167:1657b442184c 115 * *p = new
thedo 167:1657b442184c 116 * return true
thedo 167:1657b442184c 117 * }
thedo 167:1657b442184c 118 *
thedo 167:1657b442184c 119 * @note: In the failure case (where the destination isn't set), the value
thedo 167:1657b442184c 120 * pointed to by expectedCurrentValue is still updated with the current value.
thedo 167:1657b442184c 121 * This property helps writing concise code for the following incr:
thedo 167:1657b442184c 122 *
thedo 167:1657b442184c 123 * function incr(p : pointer to int, a : int) returns int {
thedo 167:1657b442184c 124 * done = false
thedo 167:1657b442184c 125 * value = *p // This fetch operation need not be atomic.
thedo 167:1657b442184c 126 * while not done {
thedo 167:1657b442184c 127 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
thedo 167:1657b442184c 128 * }
thedo 167:1657b442184c 129 * return value + a
thedo 167:1657b442184c 130 * }
thedo 167:1657b442184c 131 */
thedo 167:1657b442184c 132 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue);
thedo 167:1657b442184c 133
thedo 167:1657b442184c 134 /**
thedo 167:1657b442184c 135 * Atomic compare and set. It compares the contents of a memory location to a
thedo 167:1657b442184c 136 * given value and, only if they are the same, modifies the contents of that
thedo 167:1657b442184c 137 * memory location to a given new value. This is done as a single atomic
thedo 167:1657b442184c 138 * operation. The atomicity guarantees that the new value is calculated based on
thedo 167:1657b442184c 139 * up-to-date information; if the value had been updated by another thread in
thedo 167:1657b442184c 140 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
thedo 167:1657b442184c 141 *
thedo 167:1657b442184c 142 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
thedo 167:1657b442184c 143 * you to the article on compare-and swap].
thedo 167:1657b442184c 144 *
thedo 167:1657b442184c 145 * @param ptr The target memory location.
thedo 167:1657b442184c 146 * @param[in,out] expectedCurrentValue A pointer to some location holding the
thedo 167:1657b442184c 147 * expected current value of the data being set atomically.
thedo 167:1657b442184c 148 * The computed 'desiredValue' should be a function of this current value.
thedo 167:1657b442184c 149 * @note: This is an in-out parameter. In the
thedo 167:1657b442184c 150 * failure case of atomic_cas (where the
thedo 167:1657b442184c 151 * destination isn't set), the pointee of expectedCurrentValue is
thedo 167:1657b442184c 152 * updated with the current value.
thedo 167:1657b442184c 153 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
thedo 167:1657b442184c 154 *
thedo 167:1657b442184c 155 * @return true if the memory location was atomically
thedo 167:1657b442184c 156 * updated with the desired value (after verifying
thedo 167:1657b442184c 157 * that it contained the expectedCurrentValue),
thedo 167:1657b442184c 158 * false otherwise. In the failure case,
thedo 167:1657b442184c 159 * exepctedCurrentValue is updated with the new
thedo 167:1657b442184c 160 * value of the target memory location.
thedo 167:1657b442184c 161 *
thedo 167:1657b442184c 162 * pseudocode:
thedo 167:1657b442184c 163 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
thedo 167:1657b442184c 164 * if *p != *old {
thedo 167:1657b442184c 165 * *old = *p
thedo 167:1657b442184c 166 * return false
thedo 167:1657b442184c 167 * }
thedo 167:1657b442184c 168 * *p = new
thedo 167:1657b442184c 169 * return true
thedo 167:1657b442184c 170 * }
thedo 167:1657b442184c 171 *
thedo 167:1657b442184c 172 * @note: In the failure case (where the destination isn't set), the value
thedo 167:1657b442184c 173 * pointed to by expectedCurrentValue is still updated with the current value.
thedo 167:1657b442184c 174 * This property helps writing concise code for the following incr:
thedo 167:1657b442184c 175 *
thedo 167:1657b442184c 176 * function incr(p : pointer to int, a : int) returns int {
thedo 167:1657b442184c 177 * done = false
thedo 167:1657b442184c 178 * value = *p // This fetch operation need not be atomic.
thedo 167:1657b442184c 179 * while not done {
thedo 167:1657b442184c 180 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
thedo 167:1657b442184c 181 * }
thedo 167:1657b442184c 182 * return value + a
thedo 167:1657b442184c 183 * }
thedo 167:1657b442184c 184 */
thedo 167:1657b442184c 185 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue);
thedo 167:1657b442184c 186
thedo 167:1657b442184c 187 /**
thedo 167:1657b442184c 188 * Atomic compare and set. It compares the contents of a memory location to a
thedo 167:1657b442184c 189 * given value and, only if they are the same, modifies the contents of that
thedo 167:1657b442184c 190 * memory location to a given new value. This is done as a single atomic
thedo 167:1657b442184c 191 * operation. The atomicity guarantees that the new value is calculated based on
thedo 167:1657b442184c 192 * up-to-date information; if the value had been updated by another thread in
thedo 167:1657b442184c 193 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
thedo 167:1657b442184c 194 *
thedo 167:1657b442184c 195 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
thedo 167:1657b442184c 196 * you to the article on compare-and swap].
thedo 167:1657b442184c 197 *
thedo 167:1657b442184c 198 * @param ptr The target memory location.
thedo 167:1657b442184c 199 * @param[in,out] expectedCurrentValue A pointer to some location holding the
thedo 167:1657b442184c 200 * expected current value of the data being set atomically.
thedo 167:1657b442184c 201 * The computed 'desiredValue' should be a function of this current value.
thedo 167:1657b442184c 202 * @note: This is an in-out parameter. In the
thedo 167:1657b442184c 203 * failure case of atomic_cas (where the
thedo 167:1657b442184c 204 * destination isn't set), the pointee of expectedCurrentValue is
thedo 167:1657b442184c 205 * updated with the current value.
thedo 167:1657b442184c 206 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
thedo 167:1657b442184c 207 *
thedo 167:1657b442184c 208 * @return true if the memory location was atomically
thedo 167:1657b442184c 209 * updated with the desired value (after verifying
thedo 167:1657b442184c 210 * that it contained the expectedCurrentValue),
thedo 167:1657b442184c 211 * false otherwise. In the failure case,
thedo 167:1657b442184c 212 * exepctedCurrentValue is updated with the new
thedo 167:1657b442184c 213 * value of the target memory location.
thedo 167:1657b442184c 214 *
thedo 167:1657b442184c 215 * pseudocode:
thedo 167:1657b442184c 216 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
thedo 167:1657b442184c 217 * if *p != *old {
thedo 167:1657b442184c 218 * *old = *p
thedo 167:1657b442184c 219 * return false
thedo 167:1657b442184c 220 * }
thedo 167:1657b442184c 221 * *p = new
thedo 167:1657b442184c 222 * return true
thedo 167:1657b442184c 223 * }
thedo 167:1657b442184c 224 *
thedo 167:1657b442184c 225 * @note: In the failure case (where the destination isn't set), the value
thedo 167:1657b442184c 226 * pointed to by expectedCurrentValue is still updated with the current value.
thedo 167:1657b442184c 227 * This property helps writing concise code for the following incr:
thedo 167:1657b442184c 228 *
thedo 167:1657b442184c 229 * function incr(p : pointer to int, a : int) returns int {
thedo 167:1657b442184c 230 * done = false
thedo 167:1657b442184c 231 * value = *p // This fetch operation need not be atomic.
thedo 167:1657b442184c 232 * while not done {
thedo 167:1657b442184c 233 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
thedo 167:1657b442184c 234 * }
thedo 167:1657b442184c 235 * return value + a
thedo 167:1657b442184c 236 * }
thedo 167:1657b442184c 237 */
thedo 167:1657b442184c 238 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue);
thedo 167:1657b442184c 239
thedo 167:1657b442184c 240 /**
thedo 167:1657b442184c 241 * Atomic compare and set. It compares the contents of a memory location to a
thedo 167:1657b442184c 242 * given value and, only if they are the same, modifies the contents of that
thedo 167:1657b442184c 243 * memory location to a given new value. This is done as a single atomic
thedo 167:1657b442184c 244 * operation. The atomicity guarantees that the new value is calculated based on
thedo 167:1657b442184c 245 * up-to-date information; if the value had been updated by another thread in
thedo 167:1657b442184c 246 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
thedo 167:1657b442184c 247 *
thedo 167:1657b442184c 248 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
thedo 167:1657b442184c 249 * you to the article on compare-and swap].
thedo 167:1657b442184c 250 *
thedo 167:1657b442184c 251 * @param ptr The target memory location.
thedo 167:1657b442184c 252 * @param[in,out] expectedCurrentValue A pointer to some location holding the
thedo 167:1657b442184c 253 * expected current value of the data being set atomically.
thedo 167:1657b442184c 254 * The computed 'desiredValue' should be a function of this current value.
thedo 167:1657b442184c 255 * @note: This is an in-out parameter. In the
thedo 167:1657b442184c 256 * failure case of atomic_cas (where the
thedo 167:1657b442184c 257 * destination isn't set), the pointee of expectedCurrentValue is
thedo 167:1657b442184c 258 * updated with the current value.
thedo 167:1657b442184c 259 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
thedo 167:1657b442184c 260 *
thedo 167:1657b442184c 261 * @return true if the memory location was atomically
thedo 167:1657b442184c 262 * updated with the desired value (after verifying
thedo 167:1657b442184c 263 * that it contained the expectedCurrentValue),
thedo 167:1657b442184c 264 * false otherwise. In the failure case,
thedo 167:1657b442184c 265 * exepctedCurrentValue is updated with the new
thedo 167:1657b442184c 266 * value of the target memory location.
thedo 167:1657b442184c 267 *
thedo 167:1657b442184c 268 * pseudocode:
thedo 167:1657b442184c 269 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
thedo 167:1657b442184c 270 * if *p != *old {
thedo 167:1657b442184c 271 * *old = *p
thedo 167:1657b442184c 272 * return false
thedo 167:1657b442184c 273 * }
thedo 167:1657b442184c 274 * *p = new
thedo 167:1657b442184c 275 * return true
thedo 167:1657b442184c 276 * }
thedo 167:1657b442184c 277 *
thedo 167:1657b442184c 278 * @note: In the failure case (where the destination isn't set), the value
thedo 167:1657b442184c 279 * pointed to by expectedCurrentValue is still updated with the current value.
thedo 167:1657b442184c 280 * This property helps writing concise code for the following incr:
thedo 167:1657b442184c 281 *
thedo 167:1657b442184c 282 * function incr(p : pointer to int, a : int) returns int {
thedo 167:1657b442184c 283 * done = false
thedo 167:1657b442184c 284 * value = *p // This fetch operation need not be atomic.
thedo 167:1657b442184c 285 * while not done {
thedo 167:1657b442184c 286 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
thedo 167:1657b442184c 287 * }
thedo 167:1657b442184c 288 * return value + a
thedo 167:1657b442184c 289 * }
thedo 167:1657b442184c 290 */
thedo 167:1657b442184c 291 bool core_util_atomic_cas_ptr(void **ptr, void **expectedCurrentValue, void *desiredValue);
thedo 167:1657b442184c 292
thedo 167:1657b442184c 293 /**
thedo 167:1657b442184c 294 * Atomic increment.
thedo 167:1657b442184c 295 * @param valuePtr Target memory location being incremented.
thedo 167:1657b442184c 296 * @param delta The amount being incremented.
thedo 167:1657b442184c 297 * @return The new incremented value.
thedo 167:1657b442184c 298 */
thedo 167:1657b442184c 299 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta);
thedo 167:1657b442184c 300
thedo 167:1657b442184c 301 /**
thedo 167:1657b442184c 302 * Atomic increment.
thedo 167:1657b442184c 303 * @param valuePtr Target memory location being incremented.
thedo 167:1657b442184c 304 * @param delta The amount being incremented.
thedo 167:1657b442184c 305 * @return The new incremented value.
thedo 167:1657b442184c 306 */
thedo 167:1657b442184c 307 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta);
thedo 167:1657b442184c 308
thedo 167:1657b442184c 309 /**
thedo 167:1657b442184c 310 * Atomic increment.
thedo 167:1657b442184c 311 * @param valuePtr Target memory location being incremented.
thedo 167:1657b442184c 312 * @param delta The amount being incremented.
thedo 167:1657b442184c 313 * @return The new incremented value.
thedo 167:1657b442184c 314 */
thedo 167:1657b442184c 315 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta);
thedo 167:1657b442184c 316
thedo 167:1657b442184c 317 /**
thedo 167:1657b442184c 318 * Atomic increment.
thedo 167:1657b442184c 319 * @param valuePtr Target memory location being incremented.
thedo 167:1657b442184c 320 * @param delta The amount being incremented in bytes.
thedo 167:1657b442184c 321 * @return The new incremented value.
thedo 167:1657b442184c 322 *
thedo 167:1657b442184c 323 * @note The type of the pointer argument is not taken into account
thedo 167:1657b442184c 324 * and the pointer is incremented by bytes.
thedo 167:1657b442184c 325 */
thedo 167:1657b442184c 326 void *core_util_atomic_incr_ptr(void **valuePtr, ptrdiff_t delta);
thedo 167:1657b442184c 327
thedo 167:1657b442184c 328 /**
thedo 167:1657b442184c 329 * Atomic decrement.
thedo 167:1657b442184c 330 * @param valuePtr Target memory location being decremented.
thedo 167:1657b442184c 331 * @param delta The amount being decremented.
thedo 167:1657b442184c 332 * @return The new decremented value.
thedo 167:1657b442184c 333 */
thedo 167:1657b442184c 334 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta);
thedo 167:1657b442184c 335
thedo 167:1657b442184c 336 /**
thedo 167:1657b442184c 337 * Atomic decrement.
thedo 167:1657b442184c 338 * @param valuePtr Target memory location being decremented.
thedo 167:1657b442184c 339 * @param delta The amount being decremented.
thedo 167:1657b442184c 340 * @return The new decremented value.
thedo 167:1657b442184c 341 */
thedo 167:1657b442184c 342 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta);
thedo 167:1657b442184c 343
thedo 167:1657b442184c 344 /**
thedo 167:1657b442184c 345 * Atomic decrement.
thedo 167:1657b442184c 346 * @param valuePtr Target memory location being decremented.
thedo 167:1657b442184c 347 * @param delta The amount being decremented.
thedo 167:1657b442184c 348 * @return The new decremented value.
thedo 167:1657b442184c 349 */
thedo 167:1657b442184c 350 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta);
thedo 167:1657b442184c 351
thedo 167:1657b442184c 352 /**
thedo 167:1657b442184c 353 * Atomic decrement.
thedo 167:1657b442184c 354 * @param valuePtr Target memory location being decremented.
thedo 167:1657b442184c 355 * @param delta The amount being decremented in bytes.
thedo 167:1657b442184c 356 * @return The new decremented value.
thedo 167:1657b442184c 357 *
thedo 167:1657b442184c 358 * @note The type of the pointer argument is not taken into account
thedo 167:1657b442184c 359 * and the pointer is decremented by bytes
thedo 167:1657b442184c 360 */
thedo 167:1657b442184c 361 void *core_util_atomic_decr_ptr(void **valuePtr, ptrdiff_t delta);
thedo 167:1657b442184c 362
thedo 167:1657b442184c 363 #ifdef __cplusplus
thedo 167:1657b442184c 364 } // extern "C"
thedo 167:1657b442184c 365 #endif
thedo 167:1657b442184c 366
thedo 167:1657b442184c 367
thedo 167:1657b442184c 368 #endif // __MBED_UTIL_CRITICAL_H__
thedo 167:1657b442184c 369
thedo 167:1657b442184c 370 /** @}*/
thedo 167:1657b442184c 371