Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.
No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.
Breaks file systems for which VOP_UNLOCK doesn't work on a reclaimed
vnode.
The only case in tree right now is sys/fs/union -- most file systems
use genfs_unlock, which does work on a reclaimed vnode.
Maybe we can work around this -- and still enable VOP_RECLAIM's
callees to assert lock ownership -- by having VOP_RECLAIM unlock the
vnode instead.
PR kern/52167 signal3/t_ptrace_wait* timeouts on sparc 32-bit
This test is also marked as failure on other platforms:
PR kern/51918 ptrace tracee can prevent tracer to get its signals by masking
Both issues are valid on sparc 32-bit, but the timeout one wins.
No bump because it wouldn't have been possible to acquire the lock in
VOP_RECLAIM anyway -- instant deadlock because vn_lock waits to
transition out of the RECLAIMING state first. Benefit is that we can
now assert ownership of the lock in any operations called by
VOP_RECLAIM.
Discussed on tech-kern:
https://mail-index.netbsd.org/tech-kern/2017/04/01/msg021751.html
It's a document from June 2015.
DESCRIPTION
The NetBSD kernel provides several synchronization and interrupt control
primitives. This manpage aims at giving an overview of these interfaces
and their proper application. This document includes also basic kernel
thread control primitives and rough overview of the NetBSD kernel design.
Part of interfaces are missing, like new mechanisms for networking SMP,
as this documentation page predates them.
Initial review back in 2015 by Thomas Klausner <wiz>
This example presents a C module with its device (/dev entry) and its
content generator with algorithm defined in Lua state. The Lua state can
be changed dynamically from userland, without interruption of read(2) over
the device.
This is an example how to call Lua code from C.
jmcneill