| /* $Id$ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to you under the Apache License, Version |
| * 2.0 (the "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifdef ATOMIC_OPERATION_INC_HEADER |
| #endif |
| |
| #ifdef ATOMIC_OPERATION_INC_MEMBER |
| #endif |
| |
| #ifdef ATOMIC_OPERATION_INC_IMPL |
| inline uint32_t AtomicOperation::AtomicAdd32(volatile uint32_t &mem, uint32_t summand) { |
| //TODO: Make this thread-safe |
| uint32_t oldValue = mem; |
| __asm__ volatile ( |
| "1: ldrex r0, [%0] \n\t" //load mem into r0 |
| "add r0, r0, %1 \n\t" //add summand to r0 and store result in r0 |
| "strex r1, r0, [%0] \n\t" //store result from register back to mem |
| "cmp r1, #0 \n\t" //check if we have had exclusive access |
| "bne 1b" //if there was no exclusive access, try it again |
| : /* no output register needed */ |
| : "r" (&mem), "r"(summand) |
| : "r0" , "r1" |
| ); |
| |
| return oldValue; |
| } |
| |
| inline uint32_t AtomicOperation::AtomicSub32(volatile uint32_t &mem, uint32_t subtrahend) { |
| //TODO: Make this thread-safe |
| uint32_t oldValue = mem; |
| |
| __asm__ volatile ( |
| "2: ldrex r0, [%0] \n\t" //load mem into r0 |
| "sub r0, r0, %1 \n\t" //subs subthrahend from r0 and store result in r0 |
| "strex r1, r0, [%0] \n\t" //store result from register back to mem |
| "cmp r1, #0 \n\t" //check if we have had exclusive access |
| "bne 2b" //if there was no exclusive access, try it again |
| : /* no output register needed */ |
| : "r" (&mem), "r"(subtrahend) |
| : "r0" , "r1" |
| ); |
| |
| return oldValue; |
| } |
| |
| inline uint32_t AtomicOperation::AtomicInc32(volatile uint32_t &mem){ |
| return AtomicAdd32(mem, 1); |
| } |
| |
| inline uint32_t AtomicOperation::AtomicDec32(volatile uint32_t &mem) { |
| return AtomicSub32(mem, 1); |
| } |
| #endif |
