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Member "apr-1.7.0/atomic/unix/builtins64.c" (17 Sep 2018, 1954 Bytes) of package /linux/www/apr-1.7.0.tar.bz2:


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    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 
   21 APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem)
   22 {
   23     return *mem;
   24 }
   25 
   26 APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val)
   27 {
   28     *mem = val;
   29 }
   30 
   31 APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val)
   32 {
   33     return __sync_fetch_and_add(mem, val);
   34 }
   35 
   36 APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val)
   37 {
   38     __sync_fetch_and_sub(mem, val);
   39 }
   40 
   41 APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem)
   42 {
   43     return __sync_fetch_and_add(mem, 1);
   44 }
   45 
   46 APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem)
   47 {
   48     return __sync_sub_and_fetch(mem, 1);
   49 }
   50 
   51 APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
   52                                            apr_uint64_t cmp)
   53 {
   54     return __sync_val_compare_and_swap(mem, cmp, with);
   55 }
   56 
   57 APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val)
   58 {
   59     __sync_synchronize();
   60 
   61     return __sync_lock_test_and_set(mem, val);
   62 }
   63 
   64 #endif /* USE_ATOMICS_BUILTINS */