database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-05-03 22:24:49 +03:00
Code

spinlock emulation: Fix bug when more than INT_MAX spinlocks are initialized.

Browse Source 
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 5771d8b690
commit 6606220534
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/backend/storage/lmgr/spin.c
View File

@ -97,7 +97,7 @@ SpinlockSemaInit(PGSemaphore spinsemas)
void void
s_init_lock_sema(volatile slock_t *lock, bool nested) s_init_lock_sema(volatile slock_t *lock, bool nested)
{ {
static int counter = 0; static uint32 counter = 0;
*lock = ((++counter) % NUM_SPINLOCK_SEMAPHORES) + 1; *lock = ((++counter) % NUM_SPINLOCK_SEMAPHORES) + 1;
} }