void odp_rwlock_write_lock(odp_rwlock_t *rwlock)
{
int32_t cnt;
int is_locked = 0;
while (is_locked == 0) {
cnt = rwlock->cnt;
/* lock aquired, wait */
if (cnt != 0) {
odp_spin();
continue;
}
is_locked = odp_atomic_cmpset_u32(
(volatile uint32_t *)&rwlock->cnt,
0, -1);
}
}
void odp_rwlock_read_lock(odp_rwlock_t *rwlock)
{
int32_t cnt;
int is_locked = 0;
while (is_locked == 0) {
cnt = rwlock->cnt;
/* waiting for read lock */
if (cnt < 0) {
odp_spin();
continue;
}
is_locked = odp_atomic_cmpset_u32(
(volatile uint32_t *)&rwlock->cnt,
cnt, cnt + 1);
}
}
void odp_rwlock_read_lock(odp_rwlock_t *rwlock)
{
uint32_t cnt;
int is_locked = 0;
while (is_locked == 0) {
cnt = _odp_atomic_u32_load_mm(&rwlock->cnt, _ODP_MEMMODEL_RLX);
/* waiting for read lock */
if ((int32_t)cnt < 0) {
odp_spin();
continue;
}
is_locked = _odp_atomic_u32_cmp_xchg_strong_mm(&rwlock->cnt,
&cnt,
cnt + 1,
_ODP_MEMMODEL_ACQ,
_ODP_MEMMODEL_RLX);
}
}
void odp_rwlock_write_lock(odp_rwlock_t *rwlock)
{
uint32_t cnt;
int is_locked = 0;
while (is_locked == 0) {
uint32_t zero = 0;
cnt = _odp_atomic_u32_load_mm(&rwlock->cnt, _ODP_MEMMODEL_RLX);
/* lock acquired, wait */
if (cnt != 0) {
odp_spin();
continue;
}
is_locked = _odp_atomic_u32_cmp_xchg_strong_mm(&rwlock->cnt,
&zero,
(uint32_t)-1,
_ODP_MEMMODEL_ACQ,
_ODP_MEMMODEL_RLX);
}
}
