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Member "apr-1.7.0/atomic/os390/atomic.c" (7 Mar 2019, 3947 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 #include <stdlib.h>
   20 
   21 apr_status_t apr_atomic_init(apr_pool_t *p)
   22 {
   23 #if defined (NEED_ATOMICS_GENERIC64)
   24     return apr__atomic_generic64_init(p);
   25 #else
   26     return APR_SUCCESS;
   27 #endif
   28 }
   29 
   30 apr_uint32_t apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
   31 {
   32     apr_uint32_t old, new_val; 
   33 
   34     old = *mem;   /* old is automatically updated on cs failure */
   35     do {
   36         new_val = old + val;
   37     } while (__cs(&old, (cs_t *)mem, new_val));
   38     return old;
   39 }
   40 
   41 void apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
   42 {
   43      apr_uint32_t old, new_val;
   44 
   45      old = *mem;   /* old is automatically updated on cs failure */
   46      do {
   47          new_val = old - val;
   48      } while (__cs(&old, (cs_t *)mem, new_val));
   49 }
   50 
   51 apr_uint32_t apr_atomic_inc32(volatile apr_uint32_t *mem)
   52 {
   53     return apr_atomic_add32(mem, 1);
   54 }
   55 
   56 int apr_atomic_dec32(volatile apr_uint32_t *mem)
   57 {
   58     apr_uint32_t old, new_val; 
   59 
   60     old = *mem;   /* old is automatically updated on cs failure */
   61     do {
   62         new_val = old - 1;
   63     } while (__cs(&old, (cs_t *)mem, new_val)); 
   64 
   65     return new_val != 0;
   66 }
   67 
   68 apr_uint32_t apr_atomic_read32(volatile apr_uint32_t *mem)
   69 {
   70     return *mem;
   71 }
   72 
   73 void apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
   74 {
   75     *mem = val;
   76 }
   77 
   78 apr_uint32_t apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t swap, 
   79                               apr_uint32_t cmp)
   80 {
   81     apr_uint32_t old = cmp;
   82     
   83     __cs(&old, (cs_t *)mem, swap);
   84     return old; /* old is automatically updated from mem on cs failure */
   85 }
   86 
   87 #if APR_SIZEOF_VOIDP == 4
   88 void *apr_atomic_casptr(volatile void **mem_ptr,
   89                         void *swap_ptr,
   90                         const void *cmp_ptr)
   91 {
   92      __cs1(&cmp_ptr,     /* automatically updated from mem on __cs1 failure  */
   93            mem_ptr,      /* set from swap when __cs1 succeeds                */
   94            &swap_ptr);
   95      return (void *)cmp_ptr;
   96 }
   97 #elif APR_SIZEOF_VOIDP == 8
   98 void *apr_atomic_casptr(volatile void **mem_ptr,
   99                         void *swap_ptr,
  100                         const void *cmp_ptr)
  101 {
  102      __csg(&cmp_ptr,     /* automatically updated from mem on __csg failure  */
  103            mem_ptr,      /* set from swap when __csg succeeds                */
  104            &swap_ptr);  
  105      return (void *)cmp_ptr;
  106 }
  107 #else
  108 #error APR_SIZEOF_VOIDP value not supported
  109 #endif /* APR_SIZEOF_VOIDP */
  110 
  111 apr_uint32_t apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
  112 {
  113     apr_uint32_t old, new_val; 
  114 
  115     old = *mem;   /* old is automatically updated on cs failure */
  116     do {
  117         new_val = val;
  118     } while (__cs(&old, (cs_t *)mem, new_val)); 
  119 
  120     return old;
  121 }
  122 
  123 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem_ptr, void *new_ptr)
  124 {
  125     void *old_ptr;
  126 
  127     old_ptr = *(void **)mem_ptr; /* old is automatically updated on cs failure */
  128 #if APR_SIZEOF_VOIDP == 4
  129     do {
  130     } while (__cs1(&old_ptr, mem_ptr, &new_ptr)); 
  131 #elif APR_SIZEOF_VOIDP == 8
  132     do { 
  133     } while (__csg(&old_ptr, mem_ptr, &new_ptr)); 
  134 #else
  135 #error APR_SIZEOF_VOIDP value not supported
  136 #endif /* APR_SIZEOF_VOIDP */
  137 
  138     return old_ptr;
  139 }