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Member "apr-1.7.0/atomic/unix/s390.c" (7 Mar 2019, 4626 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_S390
   20 
   21 APR_DECLARE(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_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
   31 {
   32     return *mem;
   33 }
   34 
   35 APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
   36 {
   37     *mem = val;
   38 }
   39 
   40 static APR_INLINE apr_uint32_t atomic_add(volatile apr_uint32_t *mem, apr_uint32_t val)
   41 {
   42     apr_uint32_t prev = *mem, temp;
   43 
   44     asm volatile ("loop_%=:\n"
   45                   "    lr  %1,%0\n"
   46                   "    alr %1,%3\n"
   47                   "    cs  %0,%1,%2\n"
   48                   "    jl  loop_%=\n"
   49                   : "+d" (prev), "+d" (temp), "=Q" (*mem)
   50                   : "d" (val), "m" (*mem)
   51                   : "cc", "memory");
   52 
   53     return prev;
   54 }
   55 
   56 APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
   57 {
   58     return atomic_add(mem, val);
   59 }
   60 
   61 APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
   62 {
   63     return atomic_add(mem, 1);
   64 }
   65 
   66 static APR_INLINE apr_uint32_t atomic_sub(volatile apr_uint32_t *mem, apr_uint32_t val)
   67 {
   68     apr_uint32_t prev = *mem, temp;
   69 
   70     asm volatile ("loop_%=:\n"
   71                   "    lr  %1,%0\n"
   72                   "    slr %1,%3\n"
   73                   "    cs  %0,%1,%2\n"
   74                   "    jl  loop_%=\n"
   75                   : "+d" (prev), "+d" (temp), "=Q" (*mem)
   76                   : "d" (val), "m" (*mem)
   77                   : "cc", "memory");
   78 
   79     return temp;
   80 }
   81 
   82 APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
   83 {
   84     atomic_sub(mem, val);
   85 }
   86 
   87 APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
   88 {
   89     return atomic_sub(mem, 1);
   90 }
   91 
   92 APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
   93                                            apr_uint32_t cmp)
   94 {
   95     asm volatile ("    cs  %0,%2,%1\n"
   96                   : "+d" (cmp), "=Q" (*mem)
   97                   : "d" (with), "m" (*mem)
   98                   : "cc", "memory");
   99 
  100     return cmp;
  101 }
  102 
  103 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
  104 {
  105     apr_uint32_t prev = *mem;
  106 
  107     asm volatile ("loop_%=:\n"
  108                   "    cs  %0,%2,%1\n"
  109                   "    jl  loop_%=\n"
  110                   : "+d" (prev), "=Q" (*mem)
  111                   : "d" (val), "m" (*mem)
  112                   : "cc", "memory");
  113 
  114     return prev;
  115 }
  116 
  117 APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
  118 {
  119     void *prev = (void *) cmp;
  120 #if APR_SIZEOF_VOIDP == 4
  121     asm volatile ("    cs  %0,%2,%1\n"
  122                   : "+d" (prev), "=Q" (*mem)
  123                   : "d" (with), "m" (*mem)
  124                   : "cc", "memory");
  125 #elif APR_SIZEOF_VOIDP == 8
  126     asm volatile ("    csg %0,%2,%1\n"
  127                   : "+d" (prev), "=Q" (*mem)
  128                   : "d" (with), "m" (*mem)
  129                   : "cc", "memory");
  130 #else
  131 #error APR_SIZEOF_VOIDP value not supported
  132 #endif
  133     return prev;
  134 }
  135 
  136 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
  137 {
  138     void *prev = (void *) *mem;
  139 #if APR_SIZEOF_VOIDP == 4
  140     asm volatile ("loop_%=:\n"
  141                   "    cs  %0,%2,%1\n"
  142                   "    jl  loop_%=\n"
  143                   : "+d" (prev), "=Q" (*mem)
  144                   : "d" (with), "m" (*mem)
  145                   : "cc", "memory");
  146 #elif APR_SIZEOF_VOIDP == 8
  147     asm volatile ("loop_%=:\n"
  148                   "    csg %0,%2,%1\n"
  149                   "    jl  loop_%=\n"
  150                   : "+d" (prev), "=Q" (*mem)
  151                   : "d" (with), "m" (*mem)
  152                   : "cc", "memory");
  153 #else
  154 #error APR_SIZEOF_VOIDP value not supported
  155 #endif
  156     return prev;
  157 }
  158 
  159 #endif /* USE_ATOMICS_S390 */