+ __block_app_sigs(&set);
+
+ /* This atomic potentially competes with a concurrent pthread_detach
+ * call; the loser is responsible for freeing thread resources. */
+ int state = a_cas(&self->detach_state, DT_JOINABLE, DT_EXITING);
+
+ if (state==DT_DETACHED && self->map_base) {
+ /* Since __unmapself bypasses the normal munmap code path,
+ * explicitly wait for vmlock holders first. This must be
+ * done before any locks are taken, to avoid lock ordering
+ * issues that could lead to deadlock. */
+ __vm_wait();
+ }
+
+ /* Access to target the exiting thread with syscalls that use
+ * its kernel tid is controlled by killlock. For detached threads,
+ * any use past this point would have undefined behavior, but for
+ * joinable threads it's a valid usage that must be handled.
+ * Signals must be blocked since pthread_kill must be AS-safe. */
+ LOCK(self->killlock);
+
+ /* The thread list lock must be AS-safe, and thus depends on
+ * application signals being blocked above. */
+ __tl_lock();
+
+ /* If this is the only thread in the list, don't proceed with
+ * termination of the thread, but restore the previous lock and
+ * signal state to prepare for exit to call atexit handlers. */
+ if (self->next == self) {
+ __tl_unlock();
+ UNLOCK(self->killlock);
+ self->detach_state = state;
+ __restore_sigs(&set);
+ exit(0);
+ }
+
+ /* At this point we are committed to thread termination. */
+
+ /* After the kernel thread exits, its tid may be reused. Clear it
+ * to prevent inadvertent use and inform functions that would use
+ * it that it's no longer available. At this point the killlock
+ * may be released, since functions that use it will consistently
+ * see the thread as having exited. Release it now so that no
+ * remaining locks (except thread list) are held if we end up
+ * resetting need_locks below. */
+ self->tid = 0;
+ UNLOCK(self->killlock);
+
+ /* Process robust list in userspace to handle non-pshared mutexes
+ * and the detached thread case where the robust list head will
+ * be invalid when the kernel would process it. */
+ __vm_lock();
+ volatile void *volatile *rp;
+ while ((rp=self->robust_list.head) && rp != &self->robust_list.head) {
+ pthread_mutex_t *m = (void *)((char *)rp
+ - offsetof(pthread_mutex_t, _m_next));
+ int waiters = m->_m_waiters;
+ int priv = (m->_m_type & 128) ^ 128;
+ self->robust_list.pending = rp;
+ self->robust_list.head = *rp;
+ int cont = a_swap(&m->_m_lock, 0x40000000);
+ self->robust_list.pending = 0;
+ if (cont < 0 || waiters)
+ __wake(&m->_m_lock, 1, priv);
+ }
+ __vm_unlock();
+
+ __do_orphaned_stdio_locks();
+ __dl_thread_cleanup();