| /* 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. |
| */ |
| |
| |
| #include "apr.h" |
| #include "apr_atomic.h" |
| |
| #include <stdlib.h> |
| |
| apr_status_t apr_atomic_init(apr_pool_t *p) |
| { |
| return APR_SUCCESS; |
| } |
| |
| apr_uint32_t apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val) |
| { |
| apr_uint32_t old, new_val; |
| |
| old = *mem; /* old is automatically updated on cs failure */ |
| do { |
| new_val = old + val; |
| } while (__cs(&old, (cs_t *)mem, new_val)); |
| return old; |
| } |
| |
| void apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) |
| { |
| apr_uint32_t old, new_val; |
| |
| old = *mem; /* old is automatically updated on cs failure */ |
| do { |
| new_val = old - val; |
| } while (__cs(&old, (cs_t *)mem, new_val)); |
| } |
| |
| apr_uint32_t apr_atomic_inc32(volatile apr_uint32_t *mem) |
| { |
| return apr_atomic_add32(mem, 1); |
| } |
| |
| int apr_atomic_dec32(volatile apr_uint32_t *mem) |
| { |
| apr_uint32_t old, new_val; |
| |
| old = *mem; /* old is automatically updated on cs failure */ |
| do { |
| new_val = old - 1; |
| } while (__cs(&old, (cs_t *)mem, new_val)); |
| |
| return new_val != 0; |
| } |
| |
| apr_uint32_t apr_atomic_read32(volatile apr_uint32_t *mem) |
| { |
| return *mem; |
| } |
| |
| void apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val) |
| { |
| *mem = val; |
| } |
| |
| apr_uint32_t apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t swap, |
| apr_uint32_t cmp) |
| { |
| apr_uint32_t old = cmp; |
| |
| __cs(&old, (cs_t *)mem, swap); |
| return old; /* old is automatically updated from mem on cs failure */ |
| } |
| |
| #if APR_SIZEOF_VOIDP == 4 |
| void *apr_atomic_casptr(volatile void **mem_ptr, |
| void *swap_ptr, |
| const void *cmp_ptr) |
| { |
| __cs1(&cmp_ptr, /* automatically updated from mem on __cs1 failure */ |
| mem_ptr, /* set from swap when __cs1 succeeds */ |
| &swap_ptr); |
| return (void *)cmp_ptr; |
| } |
| #elif APR_SIZEOF_VOIDP == 8 |
| void *apr_atomic_casptr(volatile void **mem_ptr, |
| void *swap_ptr, |
| const void *cmp_ptr) |
| { |
| __csg(&cmp_ptr, /* automatically updated from mem on __csg failure */ |
| mem_ptr, /* set from swap when __csg succeeds */ |
| &swap_ptr); |
| return (void *)cmp_ptr; |
| } |
| #else |
| #error APR_SIZEOF_VOIDP value not supported |
| #endif /* APR_SIZEOF_VOIDP */ |
| |
| apr_uint32_t apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) |
| { |
| apr_uint32_t old, new_val; |
| |
| old = *mem; /* old is automatically updated on cs failure */ |
| do { |
| new_val = val; |
| } while (__cs(&old, (cs_t *)mem, new_val)); |
| |
| return old; |
| } |
| |