int
_pthread_spin_lock(pthread_spinlock_t *lock)
{
struct pthread *curthread = _get_curthread();
struct pthread_spinlock *lck;
int ret, count;
if (lock == NULL || (lck = *lock) == NULL)
ret = EINVAL;
else {
count = SPIN_COUNT;
while ((ret = THR_UMUTEX_TRYLOCK(curthread, &lck->s_lock)) != 0) {
while (lck->s_lock.m_owner) {
if (!_thr_is_smp) {
_pthread_yield();
} else {
CPU_SPINWAIT;
if (--count <= 0) {
count = SPIN_COUNT;
_pthread_yield();
}
}
}
}
ret = 0;
}
return (ret);
}
int
_pthread_spin_lock(pthread_spinlock_t *lock)
{
struct pthread *curthread;
struct pthread_spinlock *lck;
int count;
if (lock == NULL)
return (EINVAL);
lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
if (lck == NULL)
return (EINVAL);
curthread = _get_curthread();
count = SPIN_COUNT;
while (THR_UMUTEX_TRYLOCK(curthread, &lck->s_lock) != 0) {
while (lck->s_lock.m_owner) {
if (!_thr_is_smp) {
_pthread_yield();
} else {
CPU_SPINWAIT;
if (--count <= 0) {
count = SPIN_COUNT;
_pthread_yield();
}
}
}
}
return (0);
}
int
_pthread_spin_lock(pthread_spinlock_t *lock)
{
struct pthread_spinlock *lck;
struct pthread *self = _pthread_self();
int count, oldval, ret;
if (lock == NULL || (lck = *lock) == NULL)
ret = EINVAL;
else if (lck->s_owner == self)
ret = EDEADLK;
else {
do {
count = SPIN_COUNT;
while (lck->s_lock) {
#ifdef __i386__
/* tell cpu we are spinning */
__asm __volatile("pause");
#endif
if (--count <= 0) {
count = SPIN_COUNT;
_pthread_yield();
}
}
atomic_swap_int(&(lck)->s_lock, 1, &oldval);
} while (oldval);
lck->s_owner = self;
ret = 0;
}
return (ret);
}
