d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
sys/arm/include/atomic.h
View File

@ -106,7 +106,7 @@ static __inline int
atomic_load_32(volatile uint32_t *v) atomic_load_32(volatile uint32_t *v)
{ {
return (__swp(*v, v)); return (atomic_op(0, +, v));
} }
static __inline void static __inline void
@ -122,20 +122,23 @@ atomic_readandclear_32(volatile u_int32_t *p)
return (__swp(0, p)); return (__swp(0, p));
} }
#ifdef _KERNEL
static __inline u_int32_t static __inline u_int32_t
atomic_cmpset_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval) atomic_cmpset_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval)
{ {
uint32_t r, e; int done;
for (e = *p;; e = r) { __with_interrupts_disabled(
if (*p == cmpval) { {
r = __swp(newval, p); if (*p == cmpval) {
if (r == e) *p = newval;
return (1); done = 1;
} else } else
return (0); done = 0;
} });
return (done);
} }
#endif
static __inline void static __inline void
atomic_add_32(volatile u_int32_t *p, u_int32_t val) atomic_add_32(volatile u_int32_t *p, u_int32_t val)