diff options
Diffstat (limited to 'lib/libpthread/arch/arm/include/atomic_ops.h')
| -rw-r--r-- | lib/libpthread/arch/arm/include/atomic_ops.h | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/lib/libpthread/arch/arm/include/atomic_ops.h b/lib/libpthread/arch/arm/include/atomic_ops.h index e36a6bf..1ee5d80 100644 --- a/lib/libpthread/arch/arm/include/atomic_ops.h +++ b/lib/libpthread/arch/arm/include/atomic_ops.h @@ -29,6 +29,9 @@ #ifndef _ATOMIC_OPS_H_ #define _ATOMIC_OPS_H_ +#include <machine/atomic.h> +#include "thr_private.h" + /* * Atomic swap: * Atomic (tmp = *dst, *dst = val), then *res = tmp @@ -38,9 +41,7 @@ static inline void atomic_swap32(intptr_t *dst, intptr_t val, intptr_t *res) { - __asm __volatile( - "swp %2, %2, [%1]; mov %2, %0" - : "=r" (*res) : "r" (dst), "r" (val) : "cc"); + *res = __swp(val, dst); } #define atomic_swap_ptr(d, v, r) \ @@ -49,3 +50,19 @@ atomic_swap32(intptr_t *dst, intptr_t val, intptr_t *res) #define atomic_swap_int(d, v, r) \ atomic_swap32((intptr_t *)d, (intptr_t)v, (intptr_t *)r) #endif + +static inline u_int32_t +atomic_cmpset_32(volatile u_int32_t *p, u_int32_t cmpval, u_int32_t newval) +{ + kse_critical_t crit = _kse_critical_enter(); + int ret; + + if (*p == cmpval) { + *p = newval; + ret = 1; + } else + ret = 0; + _kse_critical_leave(crit); + return (ret); +} + |
