1/* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17// Don't edit this file! It is auto-generated by frameworks/rs/api/generate.sh. 18 19/* 20 * rs_atomic.rsh: Atomic Update Functions 21 * 22 * To update values shared between multiple threads, use the functions below. 23 * They ensure that the values are atomically updated, i.e. that the memory 24 * reads, the updates, and the memory writes are done in the right order. 25 * 26 * These functions are slower than their non-atomic equivalents, so use 27 * them only when synchronization is needed. 28 * 29 * Note that in RenderScript, your code is likely to be running in separate 30 * threads even though you did not explicitely create them. The RenderScript 31 * runtime will very often split the execution of one kernel across multiple 32 * threads. Updating globals should be done with atomic functions. If possible, 33 * modify your algorithm to avoid them altogether. 34 */ 35 36#ifndef RENDERSCRIPT_RS_ATOMIC_RSH 37#define RENDERSCRIPT_RS_ATOMIC_RSH 38 39/* 40 * rsAtomicAdd: Thread-safe addition 41 * 42 * Atomicly adds a value to the value at addr, i.e. *addr += value. 43 * 44 * Parameters: 45 * addr: Address of the value to modify. 46 * value: Amount to add. 47 * 48 * Returns: Value of *addr prior to the operation. 49 */ 50#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 51extern int32_t __attribute__((overloadable)) 52 rsAtomicAdd(volatile int32_t* addr, int32_t value); 53#endif 54 55#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 56extern int32_t __attribute__((overloadable)) 57 rsAtomicAdd(volatile uint32_t* addr, uint32_t value); 58#endif 59 60/* 61 * rsAtomicAnd: Thread-safe bitwise and 62 * 63 * Atomicly performs a bitwise and of two values, storing the result back at addr, 64 * i.e. *addr &= value. 65 * 66 * Parameters: 67 * addr: Address of the value to modify. 68 * value: Value to and with. 69 * 70 * Returns: Value of *addr prior to the operation. 71 */ 72#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 73extern int32_t __attribute__((overloadable)) 74 rsAtomicAnd(volatile int32_t* addr, int32_t value); 75#endif 76 77#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 78extern int32_t __attribute__((overloadable)) 79 rsAtomicAnd(volatile uint32_t* addr, uint32_t value); 80#endif 81 82/* 83 * rsAtomicCas: Thread-safe compare and set 84 * 85 * If the value at addr matches compareValue then the newValue is written at addr, 86 * i.e. if (*addr == compareValue) { *addr = newValue; }. 87 * 88 * You can check that the value was written by checking that the value returned 89 * by rsAtomicCas() is compareValue. 90 * 91 * Parameters: 92 * addr: Address of the value to compare and replace if the test passes. 93 * compareValue: Value to test *addr against. 94 * newValue: Value to write if the test passes. 95 * 96 * Returns: Value of *addr prior to the operation. 97 */ 98#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 99extern int32_t __attribute__((overloadable)) 100 rsAtomicCas(volatile int32_t* addr, int32_t compareValue, int32_t newValue); 101#endif 102 103#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 104extern uint32_t __attribute__((overloadable)) 105 rsAtomicCas(volatile uint32_t* addr, uint32_t compareValue, uint32_t newValue); 106#endif 107 108/* 109 * rsAtomicDec: Thread-safe decrement 110 * 111 * Atomicly subtracts one from the value at addr. This is equivalent to rsAtomicSub(addr, 1). 112 * 113 * Parameters: 114 * addr: Address of the value to decrement. 115 * 116 * Returns: Value of *addr prior to the operation. 117 */ 118#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 119extern int32_t __attribute__((overloadable)) 120 rsAtomicDec(volatile int32_t* addr); 121#endif 122 123#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 124extern int32_t __attribute__((overloadable)) 125 rsAtomicDec(volatile uint32_t* addr); 126#endif 127 128/* 129 * rsAtomicInc: Thread-safe increment 130 * 131 * Atomicly adds one to the value at addr. This is equivalent to rsAtomicAdd(addr, 1). 132 * 133 * Parameters: 134 * addr: Address of the value to increment. 135 * 136 * Returns: Value of *addr prior to the operation. 137 */ 138#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 139extern int32_t __attribute__((overloadable)) 140 rsAtomicInc(volatile int32_t* addr); 141#endif 142 143#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 144extern int32_t __attribute__((overloadable)) 145 rsAtomicInc(volatile uint32_t* addr); 146#endif 147 148/* 149 * rsAtomicMax: Thread-safe maximum 150 * 151 * Atomicly sets the value at addr to the maximum of *addr and value, i.e. 152 * *addr = max(*addr, value). 153 * 154 * Parameters: 155 * addr: Address of the value to modify. 156 * value: Comparison value. 157 * 158 * Returns: Value of *addr prior to the operation. 159 */ 160#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 161extern uint32_t __attribute__((overloadable)) 162 rsAtomicMax(volatile uint32_t* addr, uint32_t value); 163#endif 164 165#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 166extern int32_t __attribute__((overloadable)) 167 rsAtomicMax(volatile int32_t* addr, int32_t value); 168#endif 169 170/* 171 * rsAtomicMin: Thread-safe minimum 172 * 173 * Atomicly sets the value at addr to the minimum of *addr and value, i.e. 174 * *addr = min(*addr, value). 175 * 176 * Parameters: 177 * addr: Address of the value to modify. 178 * value: Comparison value. 179 * 180 * Returns: Value of *addr prior to the operation. 181 */ 182#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 183extern uint32_t __attribute__((overloadable)) 184 rsAtomicMin(volatile uint32_t* addr, uint32_t value); 185#endif 186 187#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 188extern int32_t __attribute__((overloadable)) 189 rsAtomicMin(volatile int32_t* addr, int32_t value); 190#endif 191 192/* 193 * rsAtomicOr: Thread-safe bitwise or 194 * 195 * Atomicly perform a bitwise or two values, storing the result at addr, 196 * i.e. *addr |= value. 197 * 198 * Parameters: 199 * addr: Address of the value to modify. 200 * value: Value to or with. 201 * 202 * Returns: Value of *addr prior to the operation. 203 */ 204#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 205extern int32_t __attribute__((overloadable)) 206 rsAtomicOr(volatile int32_t* addr, int32_t value); 207#endif 208 209#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 210extern int32_t __attribute__((overloadable)) 211 rsAtomicOr(volatile uint32_t* addr, uint32_t value); 212#endif 213 214/* 215 * rsAtomicSub: Thread-safe subtraction 216 * 217 * Atomicly subtracts a value from the value at addr, i.e. *addr -= value. 218 * 219 * Parameters: 220 * addr: Address of the value to modify. 221 * value: Amount to subtract. 222 * 223 * Returns: Value of *addr prior to the operation. 224 */ 225#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 226extern int32_t __attribute__((overloadable)) 227 rsAtomicSub(volatile int32_t* addr, int32_t value); 228#endif 229 230#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 231extern int32_t __attribute__((overloadable)) 232 rsAtomicSub(volatile uint32_t* addr, uint32_t value); 233#endif 234 235/* 236 * rsAtomicXor: Thread-safe bitwise exclusive or 237 * 238 * Atomicly performs a bitwise xor of two values, storing the result at addr, 239 * i.e. *addr ^= value. 240 * 241 * Parameters: 242 * addr: Address of the value to modify. 243 * value: Value to xor with. 244 * 245 * Returns: Value of *addr prior to the operation. 246 */ 247#if (defined(RS_VERSION) && (RS_VERSION >= 14)) 248extern int32_t __attribute__((overloadable)) 249 rsAtomicXor(volatile int32_t* addr, int32_t value); 250#endif 251 252#if (defined(RS_VERSION) && (RS_VERSION >= 20)) 253extern int32_t __attribute__((overloadable)) 254 rsAtomicXor(volatile uint32_t* addr, uint32_t value); 255#endif 256 257#endif // RENDERSCRIPT_RS_ATOMIC_RSH 258