C++ (Cpp) arch_fetch_and_add примеры использования

Пример #1

Файл: spinlock.c Проект: Chong-Li/xen

void _spin_lock(spinlock_t *lock)
{
    spinlock_tickets_t tickets = SPINLOCK_TICKET_INC;
    LOCK_PROFILE_VAR;

    check_lock(&lock->debug);
    tickets.head_tail = arch_fetch_and_add(&lock->tickets.head_tail,
                                           tickets.head_tail);
    while ( tickets.tail != observe_head(&lock->tickets) )
    {
        LOCK_PROFILE_BLOCK;
        arch_lock_relax();
    }
    LOCK_PROFILE_GOT;
    preempt_disable();
    arch_lock_acquire_barrier();
}

Пример #2

Файл: spinlock.c Проект: fdario/xen

void inline _spin_lock_cb(spinlock_t *lock, void (*cb)(void *), void *data)
{
    spinlock_tickets_t tickets = SPINLOCK_TICKET_INC;
    LOCK_PROFILE_VAR;

    check_lock(&lock->debug);
    tickets.head_tail = arch_fetch_and_add(&lock->tickets.head_tail,
                                           tickets.head_tail);
    while ( tickets.tail != observe_head(&lock->tickets) )
    {
        LOCK_PROFILE_BLOCK;
        if ( unlikely(cb) )
            cb(data);
        arch_lock_relax();
    }
    LOCK_PROFILE_GOT;
    preempt_disable();
    arch_lock_acquire_barrier();
}