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Implement atomic_swap_64(9).

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This commit is contained in:
Marius Strobl 2018-08-07 18:56:01 +00:00
parent cb0eecdf92
commit ac97c7e4c1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=337432
1 changed files with 13 additions and 0 deletions
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13
sys/arm/include/atomic-v4.h
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@ -249,6 +249,19 @@ atomic_subtract_64(volatile u_int64_t *p, u_int64_t val)
__with_interrupts_disabled(*p -= val);
}
static __inline uint64_t
atomic_swap_64(volatile uint64_t *p, uint64_t v)
{
uint64_t value;
__with_interrupts_disabled(
{
value = *p;
*p = v;
});
return (value);
}
#else /* !_KERNEL */
static __inline void