97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fspr.h"
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#include "fspr_atomic.h"
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#include <stdlib.h>
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fspr_status_t fspr_atomic_init(fspr_pool_t *p)
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{
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return APR_SUCCESS;
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}
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fspr_uint32_t fspr_atomic_add32(volatile fspr_uint32_t *mem, fspr_uint32_t val)
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{
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fspr_uint32_t old, new_val;
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old = *mem; /* old is automatically updated on cs failure */
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do {
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new_val = old + val;
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} while (__cs(&old, (cs_t *)mem, new_val));
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return old;
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}
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void fspr_atomic_sub32(volatile fspr_uint32_t *mem, fspr_uint32_t val)
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{
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fspr_uint32_t old, new_val;
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old = *mem; /* old is automatically updated on cs failure */
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do {
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new_val = old - val;
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} while (__cs(&old, (cs_t *)mem, new_val));
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}
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fspr_uint32_t fspr_atomic_inc32(volatile fspr_uint32_t *mem)
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{
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return fspr_atomic_add32(mem, 1);
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}
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int fspr_atomic_dec32(volatile fspr_uint32_t *mem)
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{
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fspr_uint32_t old, new_val;
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old = *mem; /* old is automatically updated on cs failure */
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do {
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new_val = old - 1;
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} while (__cs(&old, (cs_t *)mem, new_val));
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return new_val != 0;
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}
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fspr_uint32_t fspr_atomic_read32(volatile fspr_uint32_t *mem)
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{
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return *mem;
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}
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void fspr_atomic_set32(volatile fspr_uint32_t *mem, fspr_uint32_t val)
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{
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*mem = val;
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}
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fspr_uint32_t fspr_atomic_cas32(volatile fspr_uint32_t *mem, fspr_uint32_t swap,
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fspr_uint32_t cmp)
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{
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fspr_uint32_t old = cmp;
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__cs(&old, (cs_t *)mem, swap);
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return old; /* old is automatically updated from mem on cs failure */
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}
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fspr_uint32_t fspr_atomic_xchg32(volatile fspr_uint32_t *mem, fspr_uint32_t val)
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{
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fspr_uint32_t old, new_val;
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old = *mem; /* old is automatically updated on cs failure */
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do {
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new_val = val;
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} while (__cs(&old, (cs_t *)mem, new_val));
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return old;
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}
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