/* 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; } APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem_ptr, void *new_ptr) { void *old_ptr; old_ptr = *(void **)mem_ptr; /* old is automatically updated on cs failure */ #if APR_SIZEOF_VOIDP == 4 do { } while (__cs1(&old_ptr, mem_ptr, &new_ptr)); #elif APR_SIZEOF_VOIDP == 8 do { } while (__csg(&old_ptr, mem_ptr, &new_ptr)); #else #error APR_SIZEOF_VOIDP value not supported #endif /* APR_SIZEOF_VOIDP */ return old_ptr; }
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