void odp_ticketlock_lock(odp_ticketlock_t *ticketlock)
{
uint32_t ticket;
/* Take a ticket using an atomic increment of 'next_ticket'.
* This can be a relaxed operation but it cannot have the
* acquire semantics since we haven't acquired the lock yet */
ticket = odp_atomic_fetch_inc_u32(&ticketlock->next_ticket);
/* Spin waiting for our turn. Use load-acquire so that we acquire
* all stores from the previous lock owner */
while (ticket != odp_atomic_load_acq_u32(&ticketlock->cur_ticket))
odp_cpu_pause();
}
void odp_rwlock_read_lock(odp_rwlock_t *rwlock)
{
uint32_t cnt;
int is_locked = 0;
while (is_locked == 0) {
cnt = odp_atomic_load_u32(&rwlock->cnt);
/* waiting for read lock */
if ((int32_t)cnt < 0) {
odp_cpu_pause();
continue;
}
is_locked = odp_atomic_cas_acq_u32(&rwlock->cnt,
&cnt, cnt + 1);
}
}
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_load_u32(&rwlock->cnt);
/* lock acquired, wait */
if (cnt != 0) {
odp_cpu_pause();
continue;
}
is_locked = odp_atomic_cas_acq_u32(&rwlock->cnt,
&zero, (uint32_t)-1);
}
}
