This operation can be used for non-blocking algorithms, such as a non-blocking stack or ring.
Signed-off-by: Gage Eads <gage.e...@intel.com> --- .../common/include/arch/x86/rte_atomic_64.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h index fd2ec9c53..34c2addf8 100644 --- a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h +++ b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h @@ -34,6 +34,7 @@ /* * Inspired from FreeBSD src/sys/amd64/include/atomic.h * Copyright (c) 1998 Doug Rabson + * Copyright (c) 2019 Intel Corporation * All rights reserved. */ @@ -208,4 +209,25 @@ static inline void rte_atomic64_clear(rte_atomic64_t *v) } #endif +static inline int +rte_atomic128_cmpset(volatile uint64_t *dst, uint64_t *exp, uint64_t *src) +{ + uint8_t res; + + asm volatile ( + MPLOCKED + "cmpxchg16b %[dst];" + " sete %[res]" + : [dst] "=m" (*dst), + [res] "=r" (res) + : "c" (src[1]), + "b" (src[0]), + "m" (*dst), + "d" (exp[1]), + "a" (exp[0]) + : "memory"); + + return res; +} + #endif /* _RTE_ATOMIC_X86_64_H_ */ -- 2.13.6