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SpinLock fix

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vsadov 2022-09-19 15:12:21 -07:00
parent f133b36c8e
commit 147ed98e4a
1 changed files with 5 additions and 6 deletions
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11
src/coreclr/gc/satori/SatoriLock.h
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@ -73,7 +73,7 @@ public:
{ {
int localBackoff = m_backoff; int localBackoff = m_backoff;
while (VolatileLoadWithoutBarrier(&m_backoff) || while (VolatileLoadWithoutBarrier(&m_backoff) ||
CompareExchangeNf(&m_backoff, localBackoff / 4 + 1, 0) != 0) !CompareExchangeNf(&m_backoff, localBackoff / 4 + 1, 0))
{ {
localBackoff = Backoff(localBackoff); localBackoff = Backoff(localBackoff);
} }
@ -108,17 +108,16 @@ private:
return (backoff * 2 + 1) & 0x3FFF; return (backoff * 2 + 1) & 0x3FFF;
} }
static int CompareExchangeNf(int volatile* destination, int exchange, int comparand) static bool CompareExchangeNf(int volatile* destination, int exchange, int comparand)
{ {
#ifdef _MSC_VER #ifdef _MSC_VER
#if defined(TARGET_AMD64) #if defined(TARGET_AMD64)
return _InterlockedCompareExchange((long*)destination, exchange, comparand); return _InterlockedCompareExchange((long*)destination, exchange, comparand) == comparand;
#else #else
return _InterlockedCompareExchange_nf((long*)destination, exchange, comparand); return _InterlockedCompareExchange_nf((long*)destination, exchange, comparand) == comparand;
#endif #endif
#else #else
__atomic_compare_exchange_n(destination, &comparand, exchange, true, __ATOMIC_RELAXED, __ATOMIC_RELAXED); return __atomic_compare_exchange_n(destination, &comparand, exchange, true, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
return comparand;
#endif #endif
} }
}; };