Date: Fri, 24 Nov 2017 12:10:42 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r326161 - head/sys/i386/include Message-ID: <201711241210.vAOCAg0w092283@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: hselasky Date: Fri Nov 24 12:10:42 2017 New Revision: 326161 URL: https://svnweb.freebsd.org/changeset/base/326161 Log: Implement atomic_fetchadd_64() for i386. This function is needed by the atomic64 header file in the LinuxKPI for i386. Reviewed by: kib MFC after: 1 week Sponsored by: Mellanox Technologies Modified: head/sys/i386/include/atomic.h Modified: head/sys/i386/include/atomic.h ============================================================================== --- head/sys/i386/include/atomic.h Fri Nov 24 12:08:50 2017 (r326160) +++ head/sys/i386/include/atomic.h Fri Nov 24 12:10:42 2017 (r326161) @@ -129,6 +129,7 @@ int atomic_cmpset_64(volatile uint64_t *, uint64_t, u uint64_t atomic_load_acq_64(volatile uint64_t *); void atomic_store_rel_64(volatile uint64_t *, uint64_t); uint64_t atomic_swap_64(volatile uint64_t *, uint64_t); +uint64_t atomic_fetchadd_64(volatile uint64_t *, uint64_t); #else /* !KLD_MODULE && __GNUCLIKE_ASM */ @@ -563,6 +564,17 @@ atomic_swap_64(volatile uint64_t *p, uint64_t v) return (atomic_swap_64_i386(p, v)); else return (atomic_swap_64_i586(p, v)); +} + +static __inline uint64_t +atomic_fetchadd_64(volatile uint64_t *p, uint64_t v) +{ + + for (;;) { + uint64_t t = *p; + if (atomic_cmpset_64(p, t, t + v)) + return (t); + } } #endif /* _KERNEL */
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201711241210.vAOCAg0w092283>