Hi, claudio@ mentioned that documentation for membar_enter_after_atomic and membar_exit_before_atomic is missing.
ok? bluhm Index: membar_sync.9 =================================================================== RCS file: /data/mirror/openbsd/cvs/src/share/man/man9/membar_sync.9,v retrieving revision 1.3 diff -u -p -r1.3 membar_sync.9 --- membar_sync.9 14 Feb 2014 05:11:55 -0000 1.3 +++ membar_sync.9 10 Mar 2022 20:51:01 -0000 @@ -35,7 +35,9 @@ .Nm membar_exit , .Nm membar_producer , .Nm membar_consumer , -.Nm membar_sync +.Nm membar_sync , +.Nm membar_enter_after_atomic , +.Nm membar_exit_before_atomic .Nd memory access barrier operations .Sh SYNOPSIS .In sys/atomic.h @@ -49,6 +51,10 @@ .Fn membar_consumer "void" .Ft void .Fn membar_sync "void" +.Ft void +.Fn membar_enter_after_atomic "void" +.Ft void +.Fn membar_exit_before_atomic "void" .Sh DESCRIPTION The membar set of functions provide an interface for issuing memory barrier access operations with respect to multiple processors in the system. @@ -79,14 +85,27 @@ after the memory barrier complete. All loads and stores preceding the memory barrier will complete and reach global visibility before any loads and stores after the memory barrier complete and reach global visibility. +.It Fn membar_enter_after_atomic +An atomic operation preceding +.Fn membar_enter_after_atomic +will reach global visibility before all loads and stores following it. +The atomic operation is used to protect the start of a critical section. +.It Fn membar_exit_before_atomic +All loads and stores preceding +.Fn membar_exit_before_atomic +will reach global visibility before atomic operation that follows it. +The atomic operation is used to protect the end of a critical section. .El .Sh CONTEXT .Fn membar_enter , .Fn membar_exit , .Fn membar_producer , .Fn membar_consumer , -.Fn membar_sync -can all be called during autoconf, from process context, or from interrupt context. +.Fn membar_sync , +.Fn membar_enter_after_atomic , +.Fn membar_exit_before_atomic +can all be called during autoconf, from process context, or from +interrupt context. .Sh HISTORY The membar functions first appeared in .Nx 5.0
