diff options
Diffstat (limited to 'src/backend/port/atomics.c')
| -rw-r--r-- | src/backend/port/atomics.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/backend/port/atomics.c b/src/backend/port/atomics.c index 42169a33cf5..d5970e42b04 100644 --- a/src/backend/port/atomics.c +++ b/src/backend/port/atomics.c @@ -104,6 +104,19 @@ pg_atomic_init_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 val_) ptr->value = val_; } +void +pg_atomic_write_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 val) +{ + /* + * One might think that an unlocked write doesn't need to acquire the + * spinlock, but one would be wrong. Even an unlocked write has to cause a + * concurrent pg_atomic_compare_exchange_u32() (et al) to fail. + */ + SpinLockAcquire((slock_t *) &ptr->sema); + ptr->value = val; + SpinLockRelease((slock_t *) &ptr->sema); +} + bool pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr, uint32 *expected, uint32 newval) |