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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"
#ifdef USE_ATOMICS_S390
APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
{
#if defined(USE_ATOMICS_GENERIC64)
return apr__atomic_generic64_init(p);
#else
return APR_SUCCESS;
#endif
}
APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
{
return *mem;
}
APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
*mem = val;
}
static APR_INLINE apr_uint32_t atomic_add(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t prev = *mem, temp;
asm volatile ("loop_%=:\n"
" lr %1,%0\n"
" alr %1,%3\n"
" cs %0,%1,%2\n"
" jl loop_%=\n"
: "+d" (prev), "+d" (temp), "=Q" (*mem)
: "d" (val), "m" (*mem)
: "cc", "memory");
return prev;
}
APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
return atomic_add(mem, val);
}
APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
{
return atomic_add(mem, 1);
}
static APR_INLINE apr_uint32_t atomic_sub(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t prev = *mem, temp;
asm volatile ("loop_%=:\n"
" lr %1,%0\n"
" slr %1,%3\n"
" cs %0,%1,%2\n"
" jl loop_%=\n"
: "+d" (prev), "+d" (temp), "=Q" (*mem)
: "d" (val), "m" (*mem)
: "cc", "memory");
return temp;
}
APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
atomic_sub(mem, val);
}
APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
{
return atomic_sub(mem, 1);
}
APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
apr_uint32_t cmp)
{
asm volatile (" cs %0,%2,%1\n"
: "+d" (cmp), "=Q" (*mem)
: "d" (with), "m" (*mem)
: "cc", "memory");
return cmp;
}
APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t prev = *mem;
asm volatile ("loop_%=:\n"
" cs %0,%2,%1\n"
" jl loop_%=\n"
: "+d" (prev), "=Q" (*mem)
: "d" (val), "m" (*mem)
: "cc", "memory");
return prev;
}
APR_DECLARE(void*) apr_atomic_casptr(void *volatile *mem, void *with, const void *cmp)
{
void *prev = (void *) cmp;
#if APR_SIZEOF_VOIDP == 4
asm volatile (" cs %0,%2,%1\n"
: "+d" (prev), "=Q" (*mem)
: "d" (with), "m" (*mem)
: "cc", "memory");
#elif APR_SIZEOF_VOIDP == 8
asm volatile (" csg %0,%2,%1\n"
: "+d" (prev), "=Q" (*mem)
: "d" (with), "m" (*mem)
: "cc", "memory");
#else
#error APR_SIZEOF_VOIDP value not supported
#endif
return prev;
}
APR_DECLARE(void*) apr_atomic_xchgptr(void *volatile *mem, void *with)
{
void *prev = (void *) *mem;
#if APR_SIZEOF_VOIDP == 4
asm volatile ("loop_%=:\n"
" cs %0,%2,%1\n"
" jl loop_%=\n"
: "+d" (prev), "=Q" (*mem)
: "d" (with), "m" (*mem)
: "cc", "memory");
#elif APR_SIZEOF_VOIDP == 8
asm volatile ("loop_%=:\n"
" csg %0,%2,%1\n"
" jl loop_%=\n"
: "+d" (prev), "=Q" (*mem)
: "d" (with), "m" (*mem)
: "cc", "memory");
#else
#error APR_SIZEOF_VOIDP value not supported
#endif
return prev;
}
#endif /* USE_ATOMICS_S390 */
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