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Disable interrupts for atomic_cmpset_32, this one is just not atomic.

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Don't export it to userland.
This commit is contained in:
cognet 2004-11-05 23:48:12 +00:00
parent ab5ce77983
commit 78386f3ec2
1 changed files with 13 additions and 10 deletions
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23
sys/arm/include/atomic.h
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@ -106,7 +106,7 @@ static __inline int
atomic_load_32(volatile uint32_t *v)
{
return (__swp(*v, v));
return (atomic_op(0, +, v));
}
static __inline void
@ -122,20 +122,23 @@ atomic_readandclear_32(volatile u_int32_t *p)
return (__swp(0, p));
}
#ifdef _KERNEL
static __inline u_int32_t
atomic_cmpset_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval)
{
uint32_t r, e;
for (e = *p;; e = r) {
if (*p == cmpval) {
r = __swp(newval, p);
if (r == e)
return (1);
int done;
__with_interrupts_disabled(
{
if (*p == cmpval) {
*p = newval;
done = 1;
} else
return (0);
}
done = 0;
});
return (done);
}
#endif
static __inline void
atomic_add_32(volatile u_int32_t *p, u_int32_t val)