/* Thread termination.

   Copyright (C) 2000-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library;  if not, see

   <http://www.gnu.org/licenses/>.  */

#include <assert.h>

#include <errno.h>

#include <pthread.h>

#include <stdlib.h>

#include <pt-internal.h>

#include <pthreadP.h>

#include <atomic.h>

/* Terminate the current thread and make STATUS available to any

   thread that might join it.  */

void

__pthread_exit (void *status)

{

  struct __pthread *self = _pthread_self ();

  struct __pthread_cancelation_handler **handlers;

  int oldstate;

  /* Run any cancelation handlers.  According to POSIX, the

     cancellation cleanup handlers should be called with cancellation

     disabled.  */

  __pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);

  for (handlers = ___pthread_get_cleanup_stack ();

       *handlers != NULL;

       *handlers = (*handlers)->__next)

    (*handlers)->__handler ((*handlers)->__arg);

  __pthread_setcancelstate (oldstate, &oldstate);

  /* Decrease the number of threads.  We use an atomic operation to

     make sure that only the last thread calls `exit'.  */

  if (atomic_decrement_and_test (&__pthread_total))

    /* We are the last thread.  */

    exit (0);

  /* Note that after this point the process can be terminated at any

     point if another thread calls `pthread_exit' and happens to be

     the last thread.  */

  __pthread_mutex_lock (&self->state_lock);

  if (self->cancel_state == PTHREAD_CANCEL_ENABLE && self->cancel_pending)

    status = PTHREAD_CANCELED;

  switch (self->state)

    {

    default:

      assert (!"Consistency error: unexpected self->state");

      abort ();

      break;

    case PTHREAD_DETACHED:

      __pthread_mutex_unlock (&self->state_lock);

      break;

    case PTHREAD_JOINABLE:

      /* We need to stay around for a while since another thread

         might want to join us.  */

      self->state = PTHREAD_EXITED;

      /* We need to remember the exit status.  A thread joining us

         might ask for it.  */

      self->status = status;

      /* Broadcast the condition.  This will wake up threads that are

         waiting to join us.  */

      __pthread_cond_broadcast (&self->state_cond);

      __pthread_mutex_unlock (&self->state_lock);

      break;

    }

  /* Destroy any thread specific data.  */

  __pthread_destroy_specific (self);

  /* Destroy any signal state.  */

  __pthread_sigstate_destroy (self);

  /* Self terminating requires TLS, so defer the release of the TCB until

     the thread structure is reused.  */

  /* Release kernel resources, including the kernel thread and the stack,

     and drop the self reference.  */

  __pthread_thread_terminate (self);

  /* NOTREACHED */

  abort ();

}

strong_alias (__pthread_exit, pthread_exit);