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Add atomic_dec_not_last_64 

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
This commit is contained in:
Mateusz Guzik 2023-10-28 05:36:15 +00:00
parent 043c6ee3b6
commit 84d0c4d7ec
4 changed files with 37 additions and 0 deletions
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17
include/os/freebsd/spl/sys/atomic.h
View File

@ -149,6 +149,23 @@ atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
#endif
#endif
static inline int
atomic_dec_not_last_64(volatile uint64_t *target)
{
uint64_t val, oldval;
val = *target;
for (;;) {
if (val <= 1) {
return (0);
}
oldval = atomic_cas_64(target, val, val - 1);
if (oldval == val)
return (1);
val = oldval;
}
}
static __inline void
atomic_inc_64(volatile uint64_t *target)
{

1
include/os/linux/spl/sys/atomic.h
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@ -62,6 +62,7 @@
#define atomic_swap_64(v, x) atomic64_xchg((atomic64_t *)(v), x)
#define atomic_load_64(v) atomic64_read((atomic64_t *)(v))
#define atomic_store_64(v, x) atomic64_set((atomic64_t *)(v), x)
#define atomic_dec_not_last_64(v) atomic64_dec_if_positive((atomic64_t *)(v))
#ifdef _LP64
static __inline__ void *

18
lib/libspl/atomic.c
View File

@ -62,6 +62,24 @@ ATOMIC_DEC(uchar, uchar_t)
ATOMIC_DEC(ushort, ushort_t)
ATOMIC_DEC(uint, uint_t)
ATOMIC_DEC(ulong, ulong_t)
int
atomic_dec_not_last_64(volatile uint64_t *target)
{
uint64_t val, oldval;
val = *target;
for (;;) {
if (val <= 1) {
return (0);
}
oldval = atomic_cas_64(target, val, val - 1);
if (oldval == val)
return (1);
val = oldval;
}
}
/* END CSTYLED */

1
lib/libspl/include/atomic.h
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@ -155,6 +155,7 @@ extern uint_t atomic_dec_uint_nv(volatile uint_t *);
extern ulong_t atomic_dec_ulong_nv(volatile ulong_t *);
#if defined(_INT64_TYPE)
extern uint64_t atomic_dec_64_nv(volatile uint64_t *);
extern int atomic_dec_not_last_64(volatile uint64_t *);
#endif
/*