mirror of
https://git.proxmox.com/git/mirror_frr
synced 2025-10-31 21:46:33 +00:00
5d6299d7da
... by using `atomic_atomptr_t`. Other ideas seemed worse. Signed-off-by: David Lamparter <equinox@diac24.net>
238 lines
10 KiB
C++
238 lines
10 KiB
C++
/*
|
|
* Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#ifndef _FRRATOMIC_H
|
|
#define _FRRATOMIC_H
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#ifndef FRR_AUTOCONF_ATOMIC
|
|
#error autoconf checks for atomic functions were not properly run
|
|
#endif
|
|
|
|
/* ISO C11 */
|
|
#ifdef __cplusplus
|
|
#include <stdint.h>
|
|
#include <atomic>
|
|
using std::atomic_int;
|
|
using std::memory_order;
|
|
using std::memory_order_relaxed;
|
|
using std::memory_order_acquire;
|
|
using std::memory_order_release;
|
|
using std::memory_order_acq_rel;
|
|
using std::memory_order_consume;
|
|
using std::memory_order_seq_cst;
|
|
|
|
typedef std::atomic<bool> atomic_bool;
|
|
typedef std::atomic<size_t> atomic_size_t;
|
|
typedef std::atomic<uint_fast32_t> atomic_uint_fast32_t;
|
|
typedef std::atomic<uintptr_t> atomic_uintptr_t;
|
|
|
|
#elif defined(HAVE_STDATOMIC_H)
|
|
#include <stdatomic.h>
|
|
|
|
/* These are available in gcc, but not in stdatomic */
|
|
#define atomic_add_fetch_explicit __atomic_add_fetch
|
|
#define atomic_sub_fetch_explicit __atomic_sub_fetch
|
|
#define atomic_and_fetch_explicit __atomic_and_fetch
|
|
#define atomic_or_fetch_explicit __atomic_or_fetch
|
|
|
|
/* gcc 4.7 and newer */
|
|
#elif defined(HAVE___ATOMIC)
|
|
|
|
#define _Atomic volatile
|
|
#define _ATOMIC_WANT_TYPEDEFS
|
|
|
|
#define memory_order_relaxed __ATOMIC_RELAXED
|
|
#define memory_order_consume __ATOMIC_CONSUME
|
|
#define memory_order_acquire __ATOMIC_ACQUIRE
|
|
#define memory_order_release __ATOMIC_RELEASE
|
|
#define memory_order_acq_rel __ATOMIC_ACQ_REL
|
|
#define memory_order_seq_cst __ATOMIC_SEQ_CST
|
|
|
|
#define atomic_load_explicit __atomic_load_n
|
|
#define atomic_store_explicit __atomic_store_n
|
|
#define atomic_exchange_explicit __atomic_exchange_n
|
|
#define atomic_fetch_add_explicit __atomic_fetch_add
|
|
#define atomic_fetch_sub_explicit __atomic_fetch_sub
|
|
#define atomic_fetch_and_explicit __atomic_fetch_and
|
|
#define atomic_fetch_or_explicit __atomic_fetch_or
|
|
|
|
#define atomic_add_fetch_explicit __atomic_add_fetch
|
|
#define atomic_sub_fetch_explicit __atomic_sub_fetch
|
|
#define atomic_and_fetch_explicit __atomic_and_fetch
|
|
#define atomic_or_fetch_explicit __atomic_or_fetch
|
|
|
|
#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, \
|
|
mem2) \
|
|
__atomic_compare_exchange_n(atom, expect, desire, 1, mem1, mem2)
|
|
#define atomic_compare_exchange_strong_explicit(atom, expect, desire, mem1, \
|
|
mem2) \
|
|
__atomic_compare_exchange_n(atom, expect, desire, 0, mem1, mem2)
|
|
|
|
/* gcc 4.1 and newer,
|
|
* clang 3.3 (possibly older)
|
|
*
|
|
* __sync_swap isn't in gcc's documentation, but clang has it
|
|
*
|
|
* note __sync_synchronize()
|
|
*/
|
|
#elif defined(HAVE___SYNC)
|
|
|
|
#define _Atomic volatile
|
|
#define _ATOMIC_WANT_TYPEDEFS
|
|
|
|
#define memory_order_relaxed 0
|
|
#define memory_order_consume 0
|
|
#define memory_order_acquire 0
|
|
#define memory_order_release 0
|
|
#define memory_order_acq_rel 0
|
|
#define memory_order_seq_cst 0
|
|
|
|
#define atomic_load_explicit(ptr, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_fetch_and_add((ptr), 0); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
#define atomic_store_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
*(ptr) = (val); \
|
|
__sync_synchronize(); \
|
|
(void)0; \
|
|
})
|
|
#ifdef HAVE___SYNC_SWAP
|
|
#define atomic_exchange_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_swap((ptr, val), 0); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
#else /* !HAVE___SYNC_SWAP */
|
|
#define atomic_exchange_explicit(ptr, val, mem) \
|
|
({ \
|
|
typeof(ptr) _ptr = (ptr); \
|
|
typeof(val) _val = (val); \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) old1, old2 = __sync_fetch_and_add(_ptr, 0); \
|
|
do { \
|
|
old1 = old2; \
|
|
old2 = __sync_val_compare_and_swap(_ptr, old1, _val); \
|
|
} while (old1 != old2); \
|
|
__sync_synchronize(); \
|
|
old2; \
|
|
})
|
|
#endif /* !HAVE___SYNC_SWAP */
|
|
#define atomic_fetch_add_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_fetch_and_add((ptr), (val)); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
#define atomic_fetch_sub_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_fetch_and_sub((ptr), (val)); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
|
|
#define atomic_compare_exchange_strong_explicit(atom, expect, desire, mem1, \
|
|
mem2) \
|
|
({ \
|
|
typeof(atom) _atom = (atom); \
|
|
typeof(expect) _expect = (expect); \
|
|
typeof(desire) _desire = (desire); \
|
|
__sync_synchronize(); \
|
|
typeof(*atom) rval = \
|
|
__sync_val_compare_and_swap(_atom, *_expect, _desire); \
|
|
__sync_synchronize(); \
|
|
bool ret = (rval == *_expect); \
|
|
*_expect = rval; \
|
|
ret; \
|
|
})
|
|
#define atomic_compare_exchange_weak_explicit \
|
|
atomic_compare_exchange_strong_explicit
|
|
|
|
#define atomic_fetch_and_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_fetch_and_and(ptr, val); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
#define atomic_fetch_or_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_fetch_and_or(ptr, val); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
|
|
#define atomic_add_fetch_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_add_and_fetch((ptr), (val)); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
#define atomic_sub_fetch_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_sub_and_fetch((ptr), (val)); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
|
|
#define atomic_and_fetch_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_and_and_fetch(ptr, val); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
#define atomic_or_fetch_explicit(ptr, val, mem) \
|
|
({ \
|
|
__sync_synchronize(); \
|
|
typeof(*ptr) rval = __sync_or_and_fetch(ptr, val); \
|
|
__sync_synchronize(); \
|
|
rval; \
|
|
})
|
|
|
|
#else /* !HAVE___ATOMIC && !HAVE_STDATOMIC_H */
|
|
#error no atomic functions...
|
|
#endif
|
|
|
|
#ifdef _ATOMIC_WANT_TYPEDEFS
|
|
#undef _ATOMIC_WANT_TYPEDEFS
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
typedef _Atomic bool atomic_bool;
|
|
typedef _Atomic size_t atomic_size_t;
|
|
typedef _Atomic uint_fast32_t atomic_uint_fast32_t;
|
|
typedef _Atomic uintptr_t atomic_uintptr_t;
|
|
#endif
|
|
|
|
#endif /* _FRRATOMIC_H */
|