1251875Speter/* Licensed to the Apache Software Foundation (ASF) under one or more 2251875Speter * contributor license agreements. See the NOTICE file distributed with 3251875Speter * this work for additional information regarding copyright ownership. 4251875Speter * The ASF licenses this file to You under the Apache License, Version 2.0 5251875Speter * (the "License"); you may not use this file except in compliance with 6251875Speter * the License. You may obtain a copy of the License at 7251875Speter * 8251875Speter * http://www.apache.org/licenses/LICENSE-2.0 9251875Speter * 10251875Speter * Unless required by applicable law or agreed to in writing, software 11251875Speter * distributed under the License is distributed on an "AS IS" BASIS, 12251875Speter * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13251875Speter * See the License for the specific language governing permissions and 14251875Speter * limitations under the License. 15251875Speter */ 16251875Speter 17251875Speter#include "apr_arch_atomic.h" 18251875Speter 19251875Speter#ifdef USE_ATOMICS_IA32 20251875Speter 21251875SpeterAPR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p) 22251875Speter{ 23251875Speter return APR_SUCCESS; 24251875Speter} 25251875Speter 26251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem) 27251875Speter{ 28251875Speter return *mem; 29251875Speter} 30251875Speter 31251875SpeterAPR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val) 32251875Speter{ 33251875Speter *mem = val; 34251875Speter} 35251875Speter 36251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val) 37251875Speter{ 38251875Speter asm volatile ("lock; xaddl %0,%1" 39251875Speter : "=r" (val), "=m" (*mem) 40251875Speter : "0" (val), "m" (*mem) 41251875Speter : "memory", "cc"); 42251875Speter return val; 43251875Speter} 44251875Speter 45251875SpeterAPR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) 46251875Speter{ 47251875Speter asm volatile ("lock; subl %1, %0" 48251875Speter : /* no output */ 49251875Speter : "m" (*(mem)), "r" (val) 50251875Speter : "memory", "cc"); 51251875Speter} 52251875Speter 53251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem) 54251875Speter{ 55251875Speter return apr_atomic_add32(mem, 1); 56251875Speter} 57251875Speter 58251875SpeterAPR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem) 59251875Speter{ 60251875Speter unsigned char prev; 61251875Speter 62251875Speter asm volatile ("lock; decl %0; setnz %1" 63251875Speter : "=m" (*mem), "=qm" (prev) 64251875Speter : "m" (*mem) 65251875Speter : "memory"); 66251875Speter 67251875Speter return prev; 68251875Speter} 69251875Speter 70251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with, 71251875Speter apr_uint32_t cmp) 72251875Speter{ 73251875Speter apr_uint32_t prev; 74251875Speter 75251875Speter asm volatile ("lock; cmpxchgl %1, %2" 76251875Speter : "=a" (prev) 77251875Speter : "r" (with), "m" (*(mem)), "0"(cmp) 78251875Speter : "memory", "cc"); 79251875Speter return prev; 80251875Speter} 81251875Speter 82251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) 83251875Speter{ 84251875Speter apr_uint32_t prev = val; 85251875Speter 86251875Speter asm volatile ("xchgl %0, %1" 87251875Speter : "=r" (prev), "+m" (*mem) 88251875Speter : "0" (prev)); 89251875Speter return prev; 90251875Speter} 91251875Speter 92251875SpeterAPR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp) 93251875Speter{ 94251875Speter void *prev; 95251875Speter#if APR_SIZEOF_VOIDP == 4 96251875Speter asm volatile ("lock; cmpxchgl %2, %1" 97251875Speter : "=a" (prev), "=m" (*mem) 98251875Speter : "r" (with), "m" (*mem), "0" (cmp)); 99251875Speter#elif APR_SIZEOF_VOIDP == 8 100251875Speter asm volatile ("lock; cmpxchgq %q2, %1" 101251875Speter : "=a" (prev), "=m" (*mem) 102251875Speter : "r" ((unsigned long)with), "m" (*mem), 103251875Speter "0" ((unsigned long)cmp)); 104251875Speter#else 105251875Speter#error APR_SIZEOF_VOIDP value not supported 106251875Speter#endif 107251875Speter return prev; 108251875Speter} 109251875Speter 110251875SpeterAPR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with) 111251875Speter{ 112251875Speter void *prev; 113251875Speter#if APR_SIZEOF_VOIDP == 4 114251875Speter asm volatile ("xchgl %2, %1" 115251875Speter : "=a" (prev), "+m" (*mem) 116251875Speter : "0" (with)); 117251875Speter#elif APR_SIZEOF_VOIDP == 8 118251875Speter asm volatile ("xchgq %q2, %1" 119251875Speter : "=a" (prev), "+m" (*mem) 120253734Speter : "0" (with)); 121251875Speter#else 122251875Speter#error APR_SIZEOF_VOIDP value not supported 123251875Speter#endif 124251875Speter return prev; 125251875Speter} 126251875Speter 127251875Speter#endif /* USE_ATOMICS_IA32 */ 128