diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/ioq.c | 12 |
1 files changed, 11 insertions, 1 deletions
@@ -260,7 +260,17 @@ static struct ioqq *ioqq_create(size_t size) { /** Get the monitor associated with a slot. */ static struct ioq_monitor *ioq_slot_monitor(struct ioqq *ioqq, ioq_slot *slot) { - size_t i = slot - ioqq->slots; + uint32_t i = slot - ioqq->slots; + + // Hash the index to de-correlate waiters + // https://nullprogram.com/blog/2018/07/31/ + // https://github.com/skeeto/hash-prospector/issues/19#issuecomment-1120105785 + i ^= i >> 16; + i *= UINT32_C(0x21f0aaad); + i ^= i >> 15; + i *= UINT32_C(0x735a2d97); + i ^= i >> 15; + return &ioqq->monitors[i & ioqq->monitor_mask]; } |