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Clean up the SYSINIT_FLAGS definitions for rwlock(9) and rmlock(9).

Browse source 
Avoid duplication in their macro definitions, and document them. No
functional change intended.

MFC after:	1 week
This commit is contained in:
Mark Johnston 2017-11-21 14:59:23 +00:00
parent 2b378326f8
commit 755230eb9f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=326060
8 changed files with 35 additions and 62 deletions
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3
share/man/man9/Makefile
View file

@ -1548,6 +1548,7 @@ MLINKS+=rmlock.9 rm_assert.9 \
rmlock.9 rm_runlock.9 \
rmlock.9 rm_sleep.9 \
rmlock.9 RM_SYSINIT.9 \
rmlock.9 RM_SYSINIT_FLAGS.9 \
rmlock.9 rm_try_rlock.9 \
rmlock.9 rm_wlock.9 \
rmlock.9 rm_wowned.9 \
@ -1580,6 +1581,7 @@ MLINKS+=rwlock.9 rw_assert.9 \
rwlock.9 rw_unlock.9 \
rwlock.9 rw_sleep.9 \
rwlock.9 RW_SYSINIT.9 \
rwlock.9 RW_SYSINIT_FLAGS.9 \
rwlock.9 rw_try_rlock.9 \
rwlock.9 rw_try_upgrade.9 \
rwlock.9 rw_try_wlock.9 \
@ -1788,6 +1790,7 @@ MLINKS+=sx.9 sx_assert.9 \
sx.9 sx_slock_sig.9 \
sx.9 sx_sunlock.9 \
sx.9 SX_SYSINIT.9 \
sx.9 SX_SYSINIT_FLAGS.9 \
sx.9 sx_try_slock.9 \
sx.9 sx_try_upgrade.9 \
sx.9 sx_try_xlock.9 \

8
share/man/man9/rmlock.9
View file

@ -26,7 +26,7 @@
.\" $FreeBSD$
.\"
.\" Based on rwlock.9 man page
.Dd December 13, 2014
.Dd November 11, 2017
.Dt RMLOCK 9
.Os
.Sh NAME
@ -42,7 +42,8 @@
.Nm rm_wowned ,
.Nm rm_sleep ,
.Nm rm_assert ,
.Nm RM_SYSINIT
.Nm RM_SYSINIT ,
.Nm RM_SYSINIT_FLAGS
.Nd kernel reader/writer lock optimized for read-mostly access patterns
.Sh SYNOPSIS
.In sys/param.h
@ -74,7 +75,8 @@
.Ft void
.Fn rm_assert "struct rmlock *rm" "int what"
.In sys/kernel.h
.Fn RM_SYSINIT "name" "struct rmlock *rm" "const char *desc" "int opts"
.Fn RM_SYSINIT "name" "struct rmlock *rm" "const char *desc"
.Fn RM_SYSINIT_FLAGS "name" "struct rmlock *rm" "const char *desc" "int flags"
.Sh DESCRIPTION
Read-mostly locks allow shared access to protected data by multiple threads,
or exclusive access by a single thread.

6
share/man/man9/rwlock.9
View file

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 28, 2016
.Dd November 11, 2017
.Dt RWLOCK 9
.Os
.Sh NAME
@ -45,7 +45,8 @@
.Nm rw_initialized ,
.Nm rw_wowned ,
.Nm rw_assert ,
.Nm RW_SYSINIT
.Nm RW_SYSINIT ,
.Nm RW_SYSINIT_FLAGS
.Nd kernel reader/writer lock
.Sh SYNOPSIS
.In sys/param.h
@ -88,6 +89,7 @@
.Fn rw_assert "const struct rwlock *rw" "int what"
.In sys/kernel.h
.Fn RW_SYSINIT "name" "struct rwlock *rw" "const char *desc"
.Fn RW_SYSINIT_FLAGS "name" "struct rwlock *rw" "const char *desc" "int flags"
.Sh DESCRIPTION
Reader/writer locks allow shared access to protected data by multiple threads,
or exclusive access by a single thread.

14
share/man/man9/sx.9
View file

@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 28, 2016
.Dd November 11, 2017
.Dt SX 9
.Os
.Sh NAME
@ -49,7 +49,8 @@
.Nm sx_xholder ,
.Nm sx_xlocked ,
.Nm sx_assert ,
.Nm SX_SYSINIT
.Nm SX_SYSINIT ,
.Nm SX_SYSINIT_FLAGS
.Nd kernel shared/exclusive lock
.Sh SYNOPSIS
.In sys/param.h
@ -95,7 +96,8 @@
.Ft void
.Fn sx_assert "const struct sx *sx" "int what"
.In sys/kernel.h
.Fn SX_SYSINIT "name" "struct sx *sx" "const char *description"
.Fn SX_SYSINIT "name" "struct sx *sx" "const char *desc"
.Fn SX_SYSINIT_FLAGS "name" "struct sx *sx" "const char *desc" "int flags"
.Sh DESCRIPTION
Shared/exclusive locks are used to protect data that are read far more often
than they are written.
@ -295,6 +297,12 @@ but with an additional argument,
.Fa name ,
that is used in generating unique variable names for the related
structures associated with the lock and the sysinit routine.
The
.Fn SX_SYSINIT_FLAGS
macro can similarly be used to initialize a given
.Fa sx
lock using
.Fn sx_init_flags .
.Pp
A thread may not hold both a shared lock and an exclusive lock on the same
lock simultaneously;

13
sys/kern/kern_rmlock.c
View file

@ -338,17 +338,10 @@ rm_wowned(const struct rmlock *rm)
void
rm_sysinit(void *arg)
{
struct rm_args *args = arg;
struct rm_args *args;
rm_init(args->ra_rm, args->ra_desc);
}
void
rm_sysinit_flags(void *arg)
{
struct rm_args_flags *args = arg;
rm_init_flags(args->ra_rm, args->ra_desc, args->ra_opts);
args = arg;
rm_init_flags(args->ra_rm, args->ra_desc, args->ra_flags);
}
static int

11
sys/kern/kern_rwlock.c
View file

@ -240,16 +240,9 @@ _rw_destroy(volatile uintptr_t *c)
void
rw_sysinit(void *arg)
{
struct rw_args *args = arg;
rw_init((struct rwlock *)args->ra_rw, args->ra_desc);
}
void
rw_sysinit_flags(void *arg)
{
struct rw_args_flags *args = arg;
struct rw_args *args;
args = arg;
rw_init_flags((struct rwlock *)args->ra_rw, args->ra_desc,
args->ra_flags);
}

22
sys/sys/rmlock.h
View file

@ -103,35 +103,21 @@ void _rm_assert(const struct rmlock *rm, int what, const char *file,
struct rm_args {
struct rmlock *ra_rm;
const char *ra_desc;
int ra_flags;
};
struct rm_args_flags {
struct rmlock *ra_rm;
const char *ra_desc;
int ra_opts;
};
#define RM_SYSINIT(name, rm, desc) \
#define RM_SYSINIT_FLAGS(name, rm, desc, flags) \
static struct rm_args name##_args = { \
(rm), \
(desc), \
(flags), \
}; \
SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
rm_sysinit, &name##_args); \
SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
rm_destroy, (rm))
#define RM_SYSINIT_FLAGS(name, rm, desc, opts) \
static struct rm_args name##_args = { \
(rm), \
(desc), \
(opts), \
}; \
SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
rm_sysinit_flags, &name##_args); \
SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
rm_destroy, (rm))
#define RM_SYSINIT(name, rm, desc) RM_SYSINIT_FLAGS(name, rm, desc, 0)
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
#define RA_LOCKED LA_LOCKED

20
sys/sys/rwlock.h
View file

@ -220,35 +220,21 @@ void __rw_assert(const volatile uintptr_t *c, int what, const char *file,
struct rw_args {
void *ra_rw;
const char *ra_desc;
};
struct rw_args_flags {
void *ra_rw;
const char *ra_desc;
int ra_flags;
};
#define RW_SYSINIT(name, rw, desc) \
#define RW_SYSINIT_FLAGS(name, rw, desc, flags) \
static struct rw_args name##_args = { \
(rw), \
(desc), \
(flags), \
}; \
SYSINIT(name##_rw_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
rw_sysinit, &name##_args); \
SYSUNINIT(name##_rw_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
_rw_destroy, __DEVOLATILE(void *, &(rw)->rw_lock))
#define RW_SYSINIT_FLAGS(name, rw, desc, flags) \
static struct rw_args_flags name##_args = { \
(rw), \
(desc), \
(flags), \
}; \
SYSINIT(name##_rw_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
rw_sysinit_flags, &name##_args); \
SYSUNINIT(name##_rw_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
_rw_destroy, __DEVOLATILE(void *, &(rw)->rw_lock))
#define RW_SYSINIT(name, rw, desc) RW_SYSINIT_FLAGS(name, rw, desc, 0)
/*
* Options passed to rw_init_flags().