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This commit is contained in:
Maxime Henrion 2003-06-13 19:39:21 +00:00
parent b26ce6a4b4
commit fca737117a
1 changed files with 17 additions and 14 deletions
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31
sys/kern/kern_mtxpool.c
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@ -1,5 +1,5 @@
/*-
* Copyright (c) 2001 Matthew Dillon. All Rights Reserved. Copyright
* Copyright (c) 2001 Matthew Dillon. All Rights Reserved. Copyright
* terms are as specified in the COPYRIGHT file at the base of the source
* tree.
*
@ -14,13 +14,13 @@
* without adding bloat to the structures.
* - mutexes can be obtained for invalid pointers, useful when uses
* mutexes to interlock destructor ops.
* - no initialization/destructor overhead
* - no initialization/destructor overhead.
* - can be used with msleep.
*
* Disadvantages:
* - should generally only be used as leaf mutexes
* - should generally only be used as leaf mutexes.
* - pool/pool dependancy ordering cannot be depended on.
* - possible L1 cache mastersip contention between cpus
* - possible L1 cache mastersip contention between cpus.
*/
#include <sys/cdefs.h>
@ -38,7 +38,7 @@ __FBSDID("$FreeBSD$");
#ifndef MTX_POOL_SIZE
#define MTX_POOL_SIZE 128
#endif
#define MTX_POOL_MASK (MTX_POOL_SIZE-1)
#define MTX_POOL_MASK (MTX_POOL_SIZE - 1)
static struct mtx mtx_pool_ary[MTX_POOL_SIZE];
@ -48,14 +48,13 @@ int mtx_pool_valid = 0;
* Inline version of mtx_pool_find(), used to streamline our main API
* function calls.
*/
static __inline
struct mtx *
static __inline struct mtx *
_mtx_pool_find(void *ptr)
{
int p;
p = (int)(uintptr_t)ptr;
return(&mtx_pool_ary[(p ^ (p >> 6)) & MTX_POOL_MASK]);
return (&mtx_pool_ary[(p ^ (p >> 6)) & MTX_POOL_MASK]);
}
static void
@ -64,7 +63,8 @@ mtx_pool_setup(void *dummy __unused)
int i;
for (i = 0; i < MTX_POOL_SIZE; ++i)
mtx_init(&mtx_pool_ary[i], "pool mutex", NULL, MTX_DEF | MTX_NOWITNESS | MTX_QUIET);
mtx_init(&mtx_pool_ary[i], "pool mutex", NULL,
MTX_DEF | MTX_NOWITNESS | MTX_QUIET);
mtx_pool_valid = 1;
}
@ -77,7 +77,8 @@ struct mtx *
mtx_pool_alloc(void)
{
static int si;
return(&mtx_pool_ary[si++ & MTX_POOL_MASK]);
return (&mtx_pool_ary[si++ & MTX_POOL_MASK]);
}
/*
@ -89,16 +90,18 @@ mtx_pool_alloc(void)
struct mtx *
mtx_pool_find(void *ptr)
{
return(_mtx_pool_find(ptr));
return (_mtx_pool_find(ptr));
}
/*
* Combined find/lock operation. Lock the pool mutex associated with
* the specified address.
*/
void
void
mtx_pool_lock(void *ptr)
{
mtx_lock(_mtx_pool_find(ptr));
}
@ -109,8 +112,8 @@ mtx_pool_lock(void *ptr)
void
mtx_pool_unlock(void *ptr)
{
mtx_unlock(_mtx_pool_find(ptr));
}
SYSINIT(mtxpooli, SI_SUB_MTX_POOL, SI_ORDER_FIRST, mtx_pool_setup, NULL)
SYSINIT(mtxpooli, SI_SUB_MTX_POOL, SI_ORDER_FIRST, mtx_pool_setup, NULL);