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Correctly implement atomic_cas_ptr() function. Ideally all of these 

atomic operations will be rewritten anyway with the correct arch
specific assembly.  But not today.


git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@65 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
This commit is contained in:
behlendo 2008-04-03 21:48:57 +00:00
parent 0a6fd143fd
commit 996faa6869
2 changed files with 10 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
include/sys/atomic.h
View File

@ -16,7 +16,6 @@ extern "C" {
*/
extern spinlock_t atomic64_lock;
extern spinlock_t atomic32_lock;
extern spinlock_t atomic_lock;
static __inline__ uint32_t
atomic_add_32(volatile uint32_t *target, int32_t delta)
@ -94,7 +93,7 @@ atomic_sub_64_nv(volatile uint64_t *target, uint64_t delta)
}
static __inline__ uint64_t
atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
uint64_t newval)
{
uint64_t rc;
@ -108,19 +107,18 @@ atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
return rc;
}
#if defined(__x86_64__)
/* XXX: Implement atomic_cas_ptr() in terms of uint64'ts. This
* is of course only safe and correct for 64 bit arches... but
* for now I'm OK with that.
*/
static __inline__ void *
atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
{
void *rc;
spin_lock(&atomic_lock);
rc = (void *)target;
if (target == cmp)
target = newval;
spin_unlock(&atomic_lock);
return rc;
return (void *)atomic_cas_64((volatile uint64_t *)target,
(uint64_t)cmp, (uint64_t)newval);
}
#endif
#ifdef __cplusplus
}

2
modules/spl/spl-atomic.c
View File

@ -3,8 +3,6 @@
/* Global atomic lock declarations */
spinlock_t atomic64_lock = SPIN_LOCK_UNLOCKED;
spinlock_t atomic32_lock = SPIN_LOCK_UNLOCKED;
spinlock_t atomic_lock = SPIN_LOCK_UNLOCKED;
EXPORT_SYMBOL(atomic64_lock);
EXPORT_SYMBOL(atomic32_lock);
EXPORT_SYMBOL(atomic_lock);