remove an accidentally added file

libc/thread/wait.cc

-
-struct sem_waiter {
-    struct sem_waiter*	prev;
-    struct sem_waiter*	next;
-    sched::thread*	thread;
-};
-
-extern "C" void sem_wait(mutex_t *mutex)
-{
-    struct waiter w;
-
-    w.thread = sched::thread::current();
-
-    spin_lock(&mutex->_wait_lock);
-    if (!mutex->_wait_list.first) {
-        mutex->_wait_list.first = &w;
-    } else {
-        mutex->_wait_list.last->next = &w;
-        w.prev = mutex->_wait_list.last;
-    }
-    mutex->_wait_list.last = &w;
-    spin_unlock(&mutex->_wait_lock);
-
-    sched::thread::wait_until([=] {
-        return !mutex->_locked && mutex->_wait_list.first == &w;
-    });
-
-    spin_lock(&mutex->_wait_lock);
-    if (mutex->_wait_list.first == &w)
-        mutex->_wait_list.first = w.next;
-    else
-        w.prev->next = w.next;
-
-    if (mutex->_wait_list.last == &w)
-        mutex->_wait_list.last = w.prev;
-    spin_unlock(&mutex->_wait_lock);
-}
-
-extern "C" void sem_wake(sem_t *sem)
-{
-    spin_lock(&mutex->_wait_lock);
-    if (mutex->_wait_list.first)
-        mutex->_wait_list.first->thread->wake();
-    spin_unlock(&mutex->_wait_lock);
-}