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f765d422d1
* Add support for C11 bitwise OR & AND operations * Add atomic versions of bitfield macros Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
160 lines
7.1 KiB
C
160 lines
7.1 KiB
C
/*
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* Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _FRRATOMIC_H
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#define _FRRATOMIC_H
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef FRR_AUTOCONF_ATOMIC
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#error autoconf checks for atomic functions were not properly run
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#endif
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/* ISO C11 */
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#ifdef HAVE_STDATOMIC_H
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#include <stdatomic.h>
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/* gcc 4.7 and newer */
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#elif defined(HAVE___ATOMIC)
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#define _Atomic volatile
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#define memory_order_relaxed __ATOMIC_RELAXED
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#define memory_order_consume __ATOMIC_CONSUME
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#define memory_order_acquire __ATOMIC_ACQUIRE
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#define memory_order_release __ATOMIC_RELEASE
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#define memory_order_acq_rel __ATOMIC_ACQ_REL
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#define memory_order_seq_cst __ATOMIC_SEQ_CST
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#define atomic_load_explicit __atomic_load_n
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#define atomic_store_explicit __atomic_store_n
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#define atomic_exchange_explicit __atomic_exchange_n
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#define atomic_fetch_add_explicit __atomic_fetch_add
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#define atomic_fetch_sub_explicit __atomic_fetch_sub
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#define atomic_fetch_and_explicit __atomic_fetch_and
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#define atomic_fetch_or_explicit __atomic_fetch_or
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#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, \
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mem2) \
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__atomic_compare_exchange_n(atom, expect, desire, 1, mem1, mem2)
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/* gcc 4.1 and newer,
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* clang 3.3 (possibly older)
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*
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* __sync_swap isn't in gcc's documentation, but clang has it
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*
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* note __sync_synchronize()
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*/
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#elif defined(HAVE___SYNC)
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#define _Atomic volatile
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#define memory_order_relaxed 0
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#define memory_order_consume 0
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#define memory_order_acquire 0
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#define memory_order_release 0
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#define memory_order_acq_rel 0
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#define memory_order_seq_cst 0
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#define atomic_load_explicit(ptr, mem) \
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({ \
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__sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_add((ptr), 0); \
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__sync_synchronize(); \
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rval; \
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})
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#define atomic_store_explicit(ptr, val, mem) \
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({ \
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__sync_synchronize(); \
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*(ptr) = (val); \
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__sync_synchronize(); \
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(void)0; \
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})
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#ifdef HAVE___SYNC_SWAP
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#define atomic_exchange_explicit(ptr, val, mem) \
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({ \
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__sync_synchronize(); \
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typeof(*ptr) rval = __sync_swap((ptr, val), 0); \
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__sync_synchronize(); \
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rval; \
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})
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#else /* !HAVE___SYNC_SWAP */
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#define atomic_exchange_explicit(ptr, val, mem) \
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({ \
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typeof(ptr) _ptr = (ptr); \
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typeof(val) _val = (val); \
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__sync_synchronize(); \
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typeof(*ptr) old1, old2 = __sync_fetch_and_add(_ptr, 0); \
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do { \
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old1 = old2; \
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old2 = __sync_val_compare_and_swap(_ptr, old1, _val); \
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} while (old1 != old2); \
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__sync_synchronize(); \
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old2; \
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})
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#endif /* !HAVE___SYNC_SWAP */
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#define atomic_fetch_add_explicit(ptr, val, mem) \
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({ \
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__sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_add((ptr), (val)); \
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__sync_synchronize(); \
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rval; \
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})
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#define atomic_fetch_sub_explicit(ptr, val, mem) \
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({ \
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__sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_sub((ptr), (val)); \
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__sync_synchronize(); \
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rval; \
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})
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#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, \
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mem2) \
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({ \
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typeof(atom) _atom = (atom); \
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typeof(expect) _expect = (expect); \
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typeof(desire) _desire = (desire); \
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__sync_synchronize(); \
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typeof(*atom) rval = \
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__sync_val_compare_and_swap(_atom, *_expect, _desire); \
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__sync_synchronize(); \
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bool ret = (rval == *_expect); \
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*_expect = rval; \
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ret; \
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})
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#define atomic_fetch_and_explicit(ptr, val, mem) \
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({ \
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__sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_and(ptr, val); \
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__sync_synchronize(); \
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rval; \
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})
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#define atomic_fetch_or_explicit(ptr, val, mem) \
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({ \
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__sync_synchronize(); \
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typeof(*ptr) rval = __sync_fetch_and_or(ptr, val); \
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__sync_synchronize(); \
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rval; \
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})
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#else /* !HAVE___ATOMIC && !HAVE_STDATOMIC_H */
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#error no atomic functions...
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#endif
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#endif /* _FRRATOMIC_H */
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