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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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* Copyright 2013-2014 MongoDB, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "bson/bson-prelude.h"
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#ifndef BSON_ATOMIC_H
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#define BSON_ATOMIC_H
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#include "bson/bson-config.h"
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#include "bson/bson-compat.h"
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#include "bson/bson-macros.h"
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BSON_BEGIN_DECLS
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#if defined(__sun) && defined(__SVR4)
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/* Solaris */
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#include <atomic.h>
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#define bson_atomic_int_add(p, v) \
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atomic_add_32_nv ((volatile uint32_t *) p, (v))
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#define bson_atomic_int64_add(p, v) \
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atomic_add_64_nv ((volatile uint64_t *) p, (v))
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#elif defined(_WIN32)
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/* MSVC/MinGW */
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#define bson_atomic_int_add(p, v) \
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(InterlockedExchangeAdd ((volatile LONG *) (p), (LONG) (v)) + (LONG) (v))
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#define bson_atomic_int64_add(p, v) \
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(InterlockedExchangeAdd64 ((volatile LONGLONG *) (p), (LONGLONG) (v)) + \
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(LONGLONG) (v))
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#else
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#ifdef BSON_HAVE_ATOMIC_32_ADD_AND_FETCH
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#define bson_atomic_int_add(p, v) __sync_add_and_fetch ((p), (v))
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#else
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#define __BSON_NEED_ATOMIC_32
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#endif
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#ifdef BSON_HAVE_ATOMIC_64_ADD_AND_FETCH
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#if BSON_GNUC_IS_VERSION(4, 1)
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/*
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* GCC 4.1 on i386 can generate buggy 64-bit atomic increment.
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* So we will work around with a fallback.
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*
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40693
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*/
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#define __BSON_NEED_ATOMIC_64
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#else
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#define bson_atomic_int64_add(p, v) \
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__sync_add_and_fetch ((volatile int64_t *) (p), (int64_t) (v))
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#endif
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#else
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#define __BSON_NEED_ATOMIC_64
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#endif
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#endif
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#ifdef __BSON_NEED_ATOMIC_32
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BSON_EXPORT (int32_t)
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bson_atomic_int_add (volatile int32_t *p, int32_t n);
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#endif
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#ifdef __BSON_NEED_ATOMIC_64
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BSON_EXPORT (int64_t)
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bson_atomic_int64_add (volatile int64_t *p, int64_t n);
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#endif
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#if defined(_WIN32)
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#define bson_memory_barrier() MemoryBarrier ()
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#elif defined(__GNUC__)
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#if BSON_GNUC_CHECK_VERSION(4, 1)
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#define bson_memory_barrier() __sync_synchronize ()
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#else
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#warning "GCC Pre-4.1 discovered, using inline assembly for memory barrier."
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#define bson_memory_barrier() __asm__ volatile("" ::: "memory")
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#endif
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#elif defined(__SUNPRO_C)
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#include <mbarrier.h>
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#define bson_memory_barrier() __machine_rw_barrier ()
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#elif defined(__xlC__)
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#define bson_memory_barrier() __sync ()
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#else
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#define __BSON_NEED_BARRIER 1
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#warning "Unknown compiler, using lock for compiler barrier."
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BSON_EXPORT (void)
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bson_memory_barrier (void);
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#endif
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BSON_END_DECLS
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#endif /* BSON_ATOMIC_H */
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