bool
plasma_spin_lock_acquire_spinloop (plasma_spin_lock_t * const spin)
{
uint32_t * const lck = &spin->lck;
do {
while (plasma_atomic_load_explicit(lck, memory_order_relaxed)) {
plasma_spin_pause();
}
} while (!plasma_atomic_lock_acquire(lck)); /*(includes barrier)*/
return true;
}
bool
plasma_spin_lock_acquire_spinloop (plasma_spin_lock_t * const spin)
{
uint32_t * const lck = &spin->lck;
do {
while (plasma_atomic_ld_nopt_T(uint32_t *, lck)) {
plasma_spin_pause();
}
} while (!plasma_atomic_lock_acquire(lck)); /*(includes barrier)*/
return true;
}
bool
plasma_spin_lock_acquire_spindecay (plasma_spin_lock_t * const spin,
int pause1, int pause32, int yield)
{
/* ((uint32_t *) cast also works for Apple OSSpinLock, which is int32_t) */
uint32_t * const lck = (uint32_t *)&spin->lck;
do {
while (plasma_atomic_load_explicit(lck, memory_order_relaxed)) {
if (pause1) {
--pause1;
plasma_spin_pause();
}
else if (pause32) {
int i = 4;
--pause32;
do {
plasma_spin_pause();
plasma_spin_pause();
plasma_spin_pause();
plasma_spin_pause();
plasma_spin_pause();
plasma_spin_pause();
plasma_spin_pause();
plasma_spin_pause();
} while (--i);
}
else if (yield) {
--yield;
plasma_spin_yield();
}
else
return false;
}
} while (!plasma_atomic_lock_acquire(lck)); /*(includes barrier)*/
return true;
}
