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/* 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_arch_atomic.h"
#include <stdlib.h>
apr_status_t apr_atomic_init(apr_pool_t *p)
{
#if defined (NEED_ATOMICS_GENERIC64)
return apr__atomic_generic64_init(p);
#else
return APR_SUCCESS;
#endif
}
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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