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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.h"
#include "apr_atomic.h"
#include "apr_thread_mutex.h"
/* Of course we want the 2's compliment of the unsigned value, val */
#ifdef _MSC_VER
#pragma warning(disable: 4146)
#endif
APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
return InterlockedExchangeAdd64((volatile LONG64 *)mem, val);
}
APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
InterlockedExchangeAdd64((volatile LONG64 *)mem, -val);
}
APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem)
{
/* we return old value, win64 returns new value :( */
return InterlockedIncrement64((volatile LONG64 *)mem) - 1;
}
APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem)
{
return !!InterlockedDecrement64((volatile LONG64 *)mem);
}
APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
#if defined(_M_X64)
/* https://docs.microsoft.com/en-us/windows/win32/sync/interlocked-variable-access
* "Simple reads and writes to properly aligned 64-bit variables are atomic
* on 64-bit Windows."*/
*mem = val;
#else
InterlockedExchange64((volatile LONG64 *)mem, val);
#endif
}
APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem)
{
#if defined(_M_X64)
/* https://docs.microsoft.com/en-us/windows/win32/sync/interlocked-variable-access
* "Simple reads and writes to properly aligned 64-bit variables are atomic
* on 64-bit Windows."*/
return *mem;
#else
/* 64-bit read is not atomic on 32-bit platform: use InterlockedCompareExchange
to perform atomic read. */
return InterlockedCompareExchange64((volatile LONG64 *)mem, 0, 0);
#endif
}
APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
apr_uint64_t cmp)
{
return InterlockedCompareExchange64((volatile LONG64 *)mem, with, cmp);
}
APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
return InterlockedExchange64((volatile LONG64 *)mem, val);
}
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