Date: Mon, 5 Jul 2021 12:48:56 GMT From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 2f6dd4a29198 - stable/12 - refcount: add refcount_releasen Message-ID: <202107051248.165CmuV7012044@gitrepo.freebsd.org>
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The branch stable/12 has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=2f6dd4a29198ab82ab013e15b4eb2fa6de25d5bf commit 2f6dd4a29198ab82ab013e15b4eb2fa6de25d5bf Author: Mateusz Guzik <mjg@FreeBSD.org> AuthorDate: 2021-07-05 12:45:32 +0000 Commit: Mateusz Guzik <mjg@FreeBSD.org> CommitDate: 2021-07-05 12:48:23 +0000 refcount: add refcount_releasen This is a direct commit as the routine in main was added as a side effect of functionality which later got reverted. --- sys/sys/refcount.h | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/sys/sys/refcount.h b/sys/sys/refcount.h index 44edbdf953a0..19a8f38772a0 100644 --- a/sys/sys/refcount.h +++ b/sys/sys/refcount.h @@ -70,26 +70,33 @@ refcount_acquire_checked(volatile u_int *count) } static __inline bool -refcount_release(volatile u_int *count) +refcount_releasen(volatile u_int *count, u_int n) { u_int old; atomic_thread_fence_rel(); - old = atomic_fetchadd_int(count, -1); + old = atomic_fetchadd_int(count, -n); KASSERT(old > 0, ("refcount %p is zero", count)); - if (old > 1) + if (old > n) return (false); /* * Last reference. Signal the user to call the destructor. * - * Ensure that the destructor sees all updates. The fence_rel - * at the start of the function synchronized with this fence. + * Ensure that the destructor sees all updates. This synchronizes with + * release fences from all routines which drop the count. */ atomic_thread_fence_acq(); return (true); } +static __inline bool +refcount_release(volatile u_int *count) +{ + + return (refcount_releasen(count, 1)); +} + /* * This functions returns non-zero if the refcount was * incremented. Else zero is returned.
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