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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-
This commit is contained in:
Andres Freund 2020-06-08 15:25:49 -07:00
parent fd49d53807
commit 4d4ca24efe
1 changed files with 1 additions and 1 deletions
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2
src/backend/storage/lmgr/spin.c
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@ -106,7 +106,7 @@ SpinlockSemaInit(void)
void
s_init_lock_sema(volatile slock_t *lock, bool nested)
{
static int counter = 0;
static uint32 counter = 0;
*lock = ((++counter) % NUM_SPINLOCK_SEMAPHORES) + 1;
}