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platform/mbed_critical.h@178:79309dc6340a, 2017-11-23 (annotated)

Committer:
AnnaBridge
Date:
Thu Nov 23 11:57:25 2017 +0000
Revision:
178:79309dc6340a
Parent:
167:e84263d55307
Child:
180:96ed750bd169
mbed-dev library. Release version 156

Who changed what in which revision?

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<> 160:d5399cc887bb 1
<> 160:d5399cc887bb 2 /*
<> 160:d5399cc887bb 3 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
<> 160:d5399cc887bb 4 * SPDX-License-Identifier: Apache-2.0
<> 160:d5399cc887bb 5 *
<> 160:d5399cc887bb 6 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 160:d5399cc887bb 7 * not use this file except in compliance with the License.
<> 160:d5399cc887bb 8 * You may obtain a copy of the License at
<> 160:d5399cc887bb 9 *
<> 160:d5399cc887bb 10 * http://www.apache.org/licenses/LICENSE-2.0
<> 160:d5399cc887bb 11 *
<> 160:d5399cc887bb 12 * Unless required by applicable law or agreed to in writing, software
<> 160:d5399cc887bb 13 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 160:d5399cc887bb 14 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 160:d5399cc887bb 15 * See the License for the specific language governing permissions and
<> 160:d5399cc887bb 16 * limitations under the License.
<> 160:d5399cc887bb 17 */
<> 160:d5399cc887bb 18
<> 160:d5399cc887bb 19 #ifndef __MBED_UTIL_CRITICAL_H__
<> 160:d5399cc887bb 20 #define __MBED_UTIL_CRITICAL_H__
<> 160:d5399cc887bb 21
<> 160:d5399cc887bb 22 #include <stdbool.h>
<> 160:d5399cc887bb 23 #include <stdint.h>
<> 160:d5399cc887bb 24 #include <stddef.h>
<> 160:d5399cc887bb 25
<> 160:d5399cc887bb 26 #ifdef __cplusplus
<> 160:d5399cc887bb 27 extern "C" {
<> 160:d5399cc887bb 28 #endif
<> 160:d5399cc887bb 29
AnnaBridge 178:79309dc6340a 30 /** \addtogroup platform */
AnnaBridge 178:79309dc6340a 31 /** @{*/
AnnaBridge 178:79309dc6340a 32 /**
AnnaBridge 178:79309dc6340a 33 * \defgroup platform_critical critical section function
AnnaBridge 178:79309dc6340a 34 * @{
AnnaBridge 178:79309dc6340a 35 */
<> 160:d5399cc887bb 36
<> 160:d5399cc887bb 37 /** Determine the current interrupts enabled state
<> 160:d5399cc887bb 38 *
<> 160:d5399cc887bb 39 * This function can be called to determine whether or not interrupts are currently enabled.
AnnaBridge 167:e84263d55307 40 * @note
<> 160:d5399cc887bb 41 * NOTE:
<> 160:d5399cc887bb 42 * This function works for both cortex-A and cortex-M, although the underlyng implementation
<> 160:d5399cc887bb 43 * differs.
<> 160:d5399cc887bb 44 * @return true if interrupts are enabled, false otherwise
<> 160:d5399cc887bb 45 */
<> 160:d5399cc887bb 46 bool core_util_are_interrupts_enabled(void);
<> 160:d5399cc887bb 47
AnnaBridge 167:e84263d55307 48 /** Determine if this code is executing from an interrupt
AnnaBridge 167:e84263d55307 49 *
AnnaBridge 167:e84263d55307 50 * This function can be called to determine if the code is running on interrupt context.
AnnaBridge 167:e84263d55307 51 * @note
AnnaBridge 167:e84263d55307 52 * NOTE:
AnnaBridge 167:e84263d55307 53 * This function works for both cortex-A and cortex-M, although the underlyng implementation
AnnaBridge 167:e84263d55307 54 * differs.
AnnaBridge 167:e84263d55307 55 * @return true if in an isr, false otherwise
AnnaBridge 167:e84263d55307 56 */
AnnaBridge 167:e84263d55307 57 bool core_util_is_isr_active(void);
AnnaBridge 167:e84263d55307 58
<> 160:d5399cc887bb 59 /** Mark the start of a critical section
<> 160:d5399cc887bb 60 *
<> 160:d5399cc887bb 61 * This function should be called to mark the start of a critical section of code.
AnnaBridge 167:e84263d55307 62 * @note
<> 160:d5399cc887bb 63 * NOTES:
<> 160:d5399cc887bb 64 * 1) The use of this style of critical section is targetted at C based implementations.
<> 160:d5399cc887bb 65 * 2) These critical sections can be nested.
<> 160:d5399cc887bb 66 * 3) The interrupt enable state on entry to the first critical section (of a nested set, or single
<> 160:d5399cc887bb 67 * section) will be preserved on exit from the section.
<> 160:d5399cc887bb 68 * 4) This implementation will currently only work on code running in privileged mode.
<> 160:d5399cc887bb 69 */
<> 160:d5399cc887bb 70 void core_util_critical_section_enter(void);
<> 160:d5399cc887bb 71
<> 160:d5399cc887bb 72 /** Mark the end of a critical section
<> 160:d5399cc887bb 73 *
<> 160:d5399cc887bb 74 * This function should be called to mark the end of a critical section of code.
AnnaBridge 167:e84263d55307 75 * @note
<> 160:d5399cc887bb 76 * NOTES:
<> 160:d5399cc887bb 77 * 1) The use of this style of critical section is targetted at C based implementations.
<> 160:d5399cc887bb 78 * 2) These critical sections can be nested.
<> 160:d5399cc887bb 79 * 3) The interrupt enable state on entry to the first critical section (of a nested set, or single
<> 160:d5399cc887bb 80 * section) will be preserved on exit from the section.
<> 160:d5399cc887bb 81 * 4) This implementation will currently only work on code running in privileged mode.
<> 160:d5399cc887bb 82 */
<> 160:d5399cc887bb 83 void core_util_critical_section_exit(void);
<> 160:d5399cc887bb 84
<> 160:d5399cc887bb 85 /**
<> 160:d5399cc887bb 86 * Atomic compare and set. It compares the contents of a memory location to a
<> 160:d5399cc887bb 87 * given value and, only if they are the same, modifies the contents of that
<> 160:d5399cc887bb 88 * memory location to a given new value. This is done as a single atomic
<> 160:d5399cc887bb 89 * operation. The atomicity guarantees that the new value is calculated based on
<> 160:d5399cc887bb 90 * up-to-date information; if the value had been updated by another thread in
<> 160:d5399cc887bb 91 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
<> 160:d5399cc887bb 92 *
<> 160:d5399cc887bb 93 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
<> 160:d5399cc887bb 94 * you to the article on compare-and swap].
<> 160:d5399cc887bb 95 *
<> 160:d5399cc887bb 96 * @param ptr The target memory location.
<> 160:d5399cc887bb 97 * @param[in,out] expectedCurrentValue A pointer to some location holding the
<> 160:d5399cc887bb 98 * expected current value of the data being set atomically.
<> 160:d5399cc887bb 99 * The computed 'desiredValue' should be a function of this current value.
AnnaBridge 167:e84263d55307 100 * @note: This is an in-out parameter. In the
<> 160:d5399cc887bb 101 * failure case of atomic_cas (where the
<> 160:d5399cc887bb 102 * destination isn't set), the pointee of expectedCurrentValue is
<> 160:d5399cc887bb 103 * updated with the current value.
<> 160:d5399cc887bb 104 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
<> 160:d5399cc887bb 105 *
<> 160:d5399cc887bb 106 * @return true if the memory location was atomically
<> 160:d5399cc887bb 107 * updated with the desired value (after verifying
<> 160:d5399cc887bb 108 * that it contained the expectedCurrentValue),
<> 160:d5399cc887bb 109 * false otherwise. In the failure case,
<> 160:d5399cc887bb 110 * exepctedCurrentValue is updated with the new
<> 160:d5399cc887bb 111 * value of the target memory location.
<> 160:d5399cc887bb 112 *
<> 160:d5399cc887bb 113 * pseudocode:
<> 160:d5399cc887bb 114 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
<> 160:d5399cc887bb 115 * if *p != *old {
<> 160:d5399cc887bb 116 * *old = *p
<> 160:d5399cc887bb 117 * return false
<> 160:d5399cc887bb 118 * }
<> 160:d5399cc887bb 119 * *p = new
<> 160:d5399cc887bb 120 * return true
<> 160:d5399cc887bb 121 * }
<> 160:d5399cc887bb 122 *
AnnaBridge 167:e84263d55307 123 * @note: In the failure case (where the destination isn't set), the value
<> 160:d5399cc887bb 124 * pointed to by expectedCurrentValue is still updated with the current value.
<> 160:d5399cc887bb 125 * This property helps writing concise code for the following incr:
<> 160:d5399cc887bb 126 *
<> 160:d5399cc887bb 127 * function incr(p : pointer to int, a : int) returns int {
<> 160:d5399cc887bb 128 * done = false
<> 160:d5399cc887bb 129 * value = *p // This fetch operation need not be atomic.
<> 160:d5399cc887bb 130 * while not done {
<> 160:d5399cc887bb 131 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
<> 160:d5399cc887bb 132 * }
<> 160:d5399cc887bb 133 * return value + a
<> 160:d5399cc887bb 134 * }
<> 160:d5399cc887bb 135 */
<> 160:d5399cc887bb 136 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue);
<> 160:d5399cc887bb 137
<> 160:d5399cc887bb 138 /**
<> 160:d5399cc887bb 139 * Atomic compare and set. It compares the contents of a memory location to a
<> 160:d5399cc887bb 140 * given value and, only if they are the same, modifies the contents of that
<> 160:d5399cc887bb 141 * memory location to a given new value. This is done as a single atomic
<> 160:d5399cc887bb 142 * operation. The atomicity guarantees that the new value is calculated based on
<> 160:d5399cc887bb 143 * up-to-date information; if the value had been updated by another thread in
<> 160:d5399cc887bb 144 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
<> 160:d5399cc887bb 145 *
<> 160:d5399cc887bb 146 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
<> 160:d5399cc887bb 147 * you to the article on compare-and swap].
<> 160:d5399cc887bb 148 *
<> 160:d5399cc887bb 149 * @param ptr The target memory location.
<> 160:d5399cc887bb 150 * @param[in,out] expectedCurrentValue A pointer to some location holding the
<> 160:d5399cc887bb 151 * expected current value of the data being set atomically.
<> 160:d5399cc887bb 152 * The computed 'desiredValue' should be a function of this current value.
AnnaBridge 167:e84263d55307 153 * @note: This is an in-out parameter. In the
<> 160:d5399cc887bb 154 * failure case of atomic_cas (where the
<> 160:d5399cc887bb 155 * destination isn't set), the pointee of expectedCurrentValue is
<> 160:d5399cc887bb 156 * updated with the current value.
<> 160:d5399cc887bb 157 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
<> 160:d5399cc887bb 158 *
<> 160:d5399cc887bb 159 * @return true if the memory location was atomically
<> 160:d5399cc887bb 160 * updated with the desired value (after verifying
<> 160:d5399cc887bb 161 * that it contained the expectedCurrentValue),
<> 160:d5399cc887bb 162 * false otherwise. In the failure case,
<> 160:d5399cc887bb 163 * exepctedCurrentValue is updated with the new
<> 160:d5399cc887bb 164 * value of the target memory location.
<> 160:d5399cc887bb 165 *
<> 160:d5399cc887bb 166 * pseudocode:
<> 160:d5399cc887bb 167 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
<> 160:d5399cc887bb 168 * if *p != *old {
<> 160:d5399cc887bb 169 * *old = *p
<> 160:d5399cc887bb 170 * return false
<> 160:d5399cc887bb 171 * }
<> 160:d5399cc887bb 172 * *p = new
<> 160:d5399cc887bb 173 * return true
<> 160:d5399cc887bb 174 * }
<> 160:d5399cc887bb 175 *
AnnaBridge 167:e84263d55307 176 * @note: In the failure case (where the destination isn't set), the value
<> 160:d5399cc887bb 177 * pointed to by expectedCurrentValue is still updated with the current value.
<> 160:d5399cc887bb 178 * This property helps writing concise code for the following incr:
<> 160:d5399cc887bb 179 *
<> 160:d5399cc887bb 180 * function incr(p : pointer to int, a : int) returns int {
<> 160:d5399cc887bb 181 * done = false
<> 160:d5399cc887bb 182 * value = *p // This fetch operation need not be atomic.
<> 160:d5399cc887bb 183 * while not done {
<> 160:d5399cc887bb 184 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
<> 160:d5399cc887bb 185 * }
<> 160:d5399cc887bb 186 * return value + a
<> 160:d5399cc887bb 187 * }
<> 160:d5399cc887bb 188 */
<> 160:d5399cc887bb 189 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue);
<> 160:d5399cc887bb 190
<> 160:d5399cc887bb 191 /**
<> 160:d5399cc887bb 192 * Atomic compare and set. It compares the contents of a memory location to a
<> 160:d5399cc887bb 193 * given value and, only if they are the same, modifies the contents of that
<> 160:d5399cc887bb 194 * memory location to a given new value. This is done as a single atomic
<> 160:d5399cc887bb 195 * operation. The atomicity guarantees that the new value is calculated based on
<> 160:d5399cc887bb 196 * up-to-date information; if the value had been updated by another thread in
<> 160:d5399cc887bb 197 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
<> 160:d5399cc887bb 198 *
<> 160:d5399cc887bb 199 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
<> 160:d5399cc887bb 200 * you to the article on compare-and swap].
<> 160:d5399cc887bb 201 *
<> 160:d5399cc887bb 202 * @param ptr The target memory location.
<> 160:d5399cc887bb 203 * @param[in,out] expectedCurrentValue A pointer to some location holding the
<> 160:d5399cc887bb 204 * expected current value of the data being set atomically.
<> 160:d5399cc887bb 205 * The computed 'desiredValue' should be a function of this current value.
AnnaBridge 167:e84263d55307 206 * @note: This is an in-out parameter. In the
<> 160:d5399cc887bb 207 * failure case of atomic_cas (where the
<> 160:d5399cc887bb 208 * destination isn't set), the pointee of expectedCurrentValue is
<> 160:d5399cc887bb 209 * updated with the current value.
<> 160:d5399cc887bb 210 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
<> 160:d5399cc887bb 211 *
<> 160:d5399cc887bb 212 * @return true if the memory location was atomically
<> 160:d5399cc887bb 213 * updated with the desired value (after verifying
<> 160:d5399cc887bb 214 * that it contained the expectedCurrentValue),
<> 160:d5399cc887bb 215 * false otherwise. In the failure case,
<> 160:d5399cc887bb 216 * exepctedCurrentValue is updated with the new
<> 160:d5399cc887bb 217 * value of the target memory location.
<> 160:d5399cc887bb 218 *
<> 160:d5399cc887bb 219 * pseudocode:
<> 160:d5399cc887bb 220 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
<> 160:d5399cc887bb 221 * if *p != *old {
<> 160:d5399cc887bb 222 * *old = *p
<> 160:d5399cc887bb 223 * return false
<> 160:d5399cc887bb 224 * }
<> 160:d5399cc887bb 225 * *p = new
<> 160:d5399cc887bb 226 * return true
<> 160:d5399cc887bb 227 * }
<> 160:d5399cc887bb 228 *
AnnaBridge 167:e84263d55307 229 * @note: In the failure case (where the destination isn't set), the value
<> 160:d5399cc887bb 230 * pointed to by expectedCurrentValue is still updated with the current value.
<> 160:d5399cc887bb 231 * This property helps writing concise code for the following incr:
<> 160:d5399cc887bb 232 *
<> 160:d5399cc887bb 233 * function incr(p : pointer to int, a : int) returns int {
<> 160:d5399cc887bb 234 * done = false
<> 160:d5399cc887bb 235 * value = *p // This fetch operation need not be atomic.
<> 160:d5399cc887bb 236 * while not done {
<> 160:d5399cc887bb 237 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
<> 160:d5399cc887bb 238 * }
<> 160:d5399cc887bb 239 * return value + a
<> 160:d5399cc887bb 240 * }
<> 160:d5399cc887bb 241 */
<> 160:d5399cc887bb 242 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue);
<> 160:d5399cc887bb 243
<> 160:d5399cc887bb 244 /**
<> 160:d5399cc887bb 245 * Atomic compare and set. It compares the contents of a memory location to a
<> 160:d5399cc887bb 246 * given value and, only if they are the same, modifies the contents of that
<> 160:d5399cc887bb 247 * memory location to a given new value. This is done as a single atomic
<> 160:d5399cc887bb 248 * operation. The atomicity guarantees that the new value is calculated based on
<> 160:d5399cc887bb 249 * up-to-date information; if the value had been updated by another thread in
<> 160:d5399cc887bb 250 * the meantime, the write would fail due to a mismatched expectedCurrentValue.
<> 160:d5399cc887bb 251 *
<> 160:d5399cc887bb 252 * Refer to https://en.wikipedia.org/wiki/Compare-and-set [which may redirect
<> 160:d5399cc887bb 253 * you to the article on compare-and swap].
<> 160:d5399cc887bb 254 *
<> 160:d5399cc887bb 255 * @param ptr The target memory location.
<> 160:d5399cc887bb 256 * @param[in,out] expectedCurrentValue A pointer to some location holding the
<> 160:d5399cc887bb 257 * expected current value of the data being set atomically.
<> 160:d5399cc887bb 258 * The computed 'desiredValue' should be a function of this current value.
AnnaBridge 167:e84263d55307 259 * @note: This is an in-out parameter. In the
<> 160:d5399cc887bb 260 * failure case of atomic_cas (where the
<> 160:d5399cc887bb 261 * destination isn't set), the pointee of expectedCurrentValue is
<> 160:d5399cc887bb 262 * updated with the current value.
<> 160:d5399cc887bb 263 * @param[in] desiredValue The new value computed based on '*expectedCurrentValue'.
<> 160:d5399cc887bb 264 *
<> 160:d5399cc887bb 265 * @return true if the memory location was atomically
<> 160:d5399cc887bb 266 * updated with the desired value (after verifying
<> 160:d5399cc887bb 267 * that it contained the expectedCurrentValue),
<> 160:d5399cc887bb 268 * false otherwise. In the failure case,
<> 160:d5399cc887bb 269 * exepctedCurrentValue is updated with the new
<> 160:d5399cc887bb 270 * value of the target memory location.
<> 160:d5399cc887bb 271 *
<> 160:d5399cc887bb 272 * pseudocode:
<> 160:d5399cc887bb 273 * function cas(p : pointer to int, old : pointer to int, new : int) returns bool {
<> 160:d5399cc887bb 274 * if *p != *old {
<> 160:d5399cc887bb 275 * *old = *p
<> 160:d5399cc887bb 276 * return false
<> 160:d5399cc887bb 277 * }
<> 160:d5399cc887bb 278 * *p = new
<> 160:d5399cc887bb 279 * return true
<> 160:d5399cc887bb 280 * }
<> 160:d5399cc887bb 281 *
AnnaBridge 167:e84263d55307 282 * @note: In the failure case (where the destination isn't set), the value
<> 160:d5399cc887bb 283 * pointed to by expectedCurrentValue is still updated with the current value.
<> 160:d5399cc887bb 284 * This property helps writing concise code for the following incr:
<> 160:d5399cc887bb 285 *
<> 160:d5399cc887bb 286 * function incr(p : pointer to int, a : int) returns int {
<> 160:d5399cc887bb 287 * done = false
<> 160:d5399cc887bb 288 * value = *p // This fetch operation need not be atomic.
<> 160:d5399cc887bb 289 * while not done {
<> 160:d5399cc887bb 290 * done = atomic_cas(p, &value, value + a) // *value gets updated automatically until success
<> 160:d5399cc887bb 291 * }
<> 160:d5399cc887bb 292 * return value + a
<> 160:d5399cc887bb 293 * }
<> 160:d5399cc887bb 294 */
<> 160:d5399cc887bb 295 bool core_util_atomic_cas_ptr(void **ptr, void **expectedCurrentValue, void *desiredValue);
<> 160:d5399cc887bb 296
<> 160:d5399cc887bb 297 /**
<> 160:d5399cc887bb 298 * Atomic increment.
<> 160:d5399cc887bb 299 * @param valuePtr Target memory location being incremented.
<> 160:d5399cc887bb 300 * @param delta The amount being incremented.
<> 160:d5399cc887bb 301 * @return The new incremented value.
<> 160:d5399cc887bb 302 */
<> 160:d5399cc887bb 303 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta);
<> 160:d5399cc887bb 304
<> 160:d5399cc887bb 305 /**
<> 160:d5399cc887bb 306 * Atomic increment.
<> 160:d5399cc887bb 307 * @param valuePtr Target memory location being incremented.
<> 160:d5399cc887bb 308 * @param delta The amount being incremented.
<> 160:d5399cc887bb 309 * @return The new incremented value.
<> 160:d5399cc887bb 310 */
<> 160:d5399cc887bb 311 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta);
<> 160:d5399cc887bb 312
<> 160:d5399cc887bb 313 /**
<> 160:d5399cc887bb 314 * Atomic increment.
<> 160:d5399cc887bb 315 * @param valuePtr Target memory location being incremented.
<> 160:d5399cc887bb 316 * @param delta The amount being incremented.
<> 160:d5399cc887bb 317 * @return The new incremented value.
<> 160:d5399cc887bb 318 */
<> 160:d5399cc887bb 319 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta);
<> 160:d5399cc887bb 320
<> 160:d5399cc887bb 321 /**
<> 160:d5399cc887bb 322 * Atomic increment.
<> 160:d5399cc887bb 323 * @param valuePtr Target memory location being incremented.
<> 160:d5399cc887bb 324 * @param delta The amount being incremented in bytes.
<> 160:d5399cc887bb 325 * @return The new incremented value.
<> 160:d5399cc887bb 326 *
<> 160:d5399cc887bb 327 * @note The type of the pointer argument is not taken into account
<> 160:d5399cc887bb 328 * and the pointer is incremented by bytes.
<> 160:d5399cc887bb 329 */
<> 160:d5399cc887bb 330 void *core_util_atomic_incr_ptr(void **valuePtr, ptrdiff_t delta);
<> 160:d5399cc887bb 331
<> 160:d5399cc887bb 332 /**
<> 160:d5399cc887bb 333 * Atomic decrement.
<> 160:d5399cc887bb 334 * @param valuePtr Target memory location being decremented.
<> 160:d5399cc887bb 335 * @param delta The amount being decremented.
<> 160:d5399cc887bb 336 * @return The new decremented value.
<> 160:d5399cc887bb 337 */
<> 160:d5399cc887bb 338 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta);
<> 160:d5399cc887bb 339
<> 160:d5399cc887bb 340 /**
<> 160:d5399cc887bb 341 * Atomic decrement.
<> 160:d5399cc887bb 342 * @param valuePtr Target memory location being decremented.
<> 160:d5399cc887bb 343 * @param delta The amount being decremented.
<> 160:d5399cc887bb 344 * @return The new decremented value.
<> 160:d5399cc887bb 345 */
<> 160:d5399cc887bb 346 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta);
<> 160:d5399cc887bb 347
<> 160:d5399cc887bb 348 /**
<> 160:d5399cc887bb 349 * Atomic decrement.
<> 160:d5399cc887bb 350 * @param valuePtr Target memory location being decremented.
<> 160:d5399cc887bb 351 * @param delta The amount being decremented.
<> 160:d5399cc887bb 352 * @return The new decremented value.
<> 160:d5399cc887bb 353 */
<> 160:d5399cc887bb 354 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta);
<> 160:d5399cc887bb 355
<> 160:d5399cc887bb 356 /**
<> 160:d5399cc887bb 357 * Atomic decrement.
<> 160:d5399cc887bb 358 * @param valuePtr Target memory location being decremented.
<> 160:d5399cc887bb 359 * @param delta The amount being decremented in bytes.
<> 160:d5399cc887bb 360 * @return The new decremented value.
<> 160:d5399cc887bb 361 *
<> 160:d5399cc887bb 362 * @note The type of the pointer argument is not taken into account
<> 160:d5399cc887bb 363 * and the pointer is decremented by bytes
<> 160:d5399cc887bb 364 */
<> 160:d5399cc887bb 365 void *core_util_atomic_decr_ptr(void **valuePtr, ptrdiff_t delta);
<> 160:d5399cc887bb 366
<> 160:d5399cc887bb 367 #ifdef __cplusplus
<> 160:d5399cc887bb 368 } // extern "C"
<> 160:d5399cc887bb 369 #endif
AnnaBridge 178:79309dc6340a 370 /**@}*/
<> 160:d5399cc887bb 371
AnnaBridge 178:79309dc6340a 372 /**@}*/
<> 160:d5399cc887bb 373
<> 160:d5399cc887bb 374 #endif // __MBED_UTIL_CRITICAL_H__
<> 160:d5399cc887bb 375
AnnaBridge 178:79309dc6340a 376
AnnaBridge 178:79309dc6340a 377