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spinlock emulation: Fix bug when more than INT_MAX spinlocks are initialized.
Once the counter goes negative we ended up with spinlocks that errored out on first use (due to check in tas_sema). Author: Andres Freund Reviewed-By: Robert Haas Discussion: https://postgr.es/m/20200606023103.avzrctgv7476xj7i@alap3.anarazel.de Backpatch: 9.5-
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@ -106,7 +106,7 @@ SpinlockSemaInit(void)
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void
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void
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s_init_lock_sema(volatile slock_t *lock, bool nested)
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s_init_lock_sema(volatile slock_t *lock, bool nested)
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{
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{
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static int counter = 0;
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static uint32 counter = 0;
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*lock = ((++counter) % NUM_SPINLOCK_SEMAPHORES) + 1;
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*lock = ((++counter) % NUM_SPINLOCK_SEMAPHORES) + 1;
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}
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}
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