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mdbx: minor refine safe64_write(), safe64_read() and safe64_inc().

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Леонид Юрьев (Leonid Yuriev) 2022-07-08 22:08:10 +03:00
parent baea4c81c9
commit 6f6c581c6e
1 changed files with 6 additions and 4 deletions
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10
src/core.c
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@ -1146,7 +1146,7 @@ static __always_inline bool safe64_reset_compare(MDBX_atomic_uint64_t *p,
static __always_inline void safe64_write(MDBX_atomic_uint64_t *p, static __always_inline void safe64_write(MDBX_atomic_uint64_t *p,
const uint64_t v) { const uint64_t v) {
assert(p->weak >= SAFE64_INVALID_THRESHOLD); assert(p->weak >= SAFE64_INVALID_THRESHOLD);
#if MDBX_64BIT_ATOMIC #if MDBX_64BIT_ATOMIC && MDBX_64BIT_CAS
atomic_store64(p, v, mo_AcquireRelease); atomic_store64(p, v, mo_AcquireRelease);
#else /* MDBX_64BIT_ATOMIC */ #else /* MDBX_64BIT_ATOMIC */
mdbx_compiler_barrier(); mdbx_compiler_barrier();
@ -1163,8 +1163,10 @@ static __always_inline void safe64_write(MDBX_atomic_uint64_t *p,
static __always_inline uint64_t safe64_read(const MDBX_atomic_uint64_t *p) { static __always_inline uint64_t safe64_read(const MDBX_atomic_uint64_t *p) {
mdbx_jitter4testing(true); mdbx_jitter4testing(true);
uint64_t v = atomic_load64(p, mo_AcquireRelease); uint64_t v;
mdbx_jitter4testing(true); do
v = atomic_load64(p, mo_AcquireRelease);
while (!MDBX_64BIT_ATOMIC && unlikely(v != p->weak));
return v; return v;
} }
@ -1206,7 +1208,7 @@ MDBX_MAYBE_UNUSED static
void void
safe64_inc(MDBX_atomic_uint64_t *p, const uint64_t v) { safe64_inc(MDBX_atomic_uint64_t *p, const uint64_t v) {
assert(v > 0); assert(v > 0);
safe64_update(p, atomic_load64(p, mo_Relaxed) + v); safe64_update(p, safe64_read(p) + v);
} }
/*----------------------------------------------------------------------------*/ /*----------------------------------------------------------------------------*/