KHMEXP khm_boolean KHMAPI InitializeOnce(PIONCE pOnce)
{
if (InterlockedCompareExchangeAcquire(&pOnce->i_initializing, 1, 0) == 0) {
InterlockedExchange(&pOnce->i_thrd, GetCurrentThreadId());
return TRUE;
} else {
DWORD this_thrd;
unsigned spin_count = 0;
#define MAX_SPIN_COUNT 100
#define FAILOVER_MS 100
this_thrd = GetCurrentThreadId();
while (pOnce->i_done == 0 && (DWORD) pOnce->i_thrd != this_thrd) {
Sleep((spin_count / MAX_SPIN_COUNT) * FAILOVER_MS);
spin_count++;
}
return FALSE;
}
}
inline ::LONG compare_exchange_acquire
( ::LONG z, volatile ::LONG& x, ::LONG y )
{
return InterlockedCompareExchangeAcquire(&x, y, z);
}
