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); } }