1/* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. 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#include "apr_arch_atomic.h" 18 19#ifdef USE_ATOMICS_BUILTINS 20 21APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p) 22{ 23 return APR_SUCCESS; 24} 25 26APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem) 27{ 28 return *mem; 29} 30 31APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val) 32{ 33 *mem = val; 34} 35 36APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val) 37{ 38 return __sync_fetch_and_add(mem, val); 39} 40 41APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) 42{ 43 __sync_fetch_and_sub(mem, val); 44} 45 46APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem) 47{ 48 return __sync_fetch_and_add(mem, 1); 49} 50 51APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem) 52{ 53 return __sync_sub_and_fetch(mem, 1); 54} 55 56APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with, 57 apr_uint32_t cmp) 58{ 59 return __sync_val_compare_and_swap(mem, cmp, with); 60} 61 62APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) 63{ 64 __sync_synchronize(); 65 66 return __sync_lock_test_and_set(mem, val); 67} 68 69APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp) 70{ 71 return (void*) __sync_val_compare_and_swap(mem, cmp, with); 72} 73 74APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with) 75{ 76 __sync_synchronize(); 77 78 return (void*) __sync_lock_test_and_set(mem, with); 79} 80 81#endif /* USE_ATOMICS_BUILTINS */ 82