/* Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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 <stdlib.h>

#include "pthreadP.h"

void

__cleanup_fct_attribute

__pthread_register_cancel_defer (__pthread_unwind_buf_t *buf)

{

  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;

  struct pthread *self = THREAD_SELF;

  /* Store old info.  */

  ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);

  ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup);

  int cancelhandling = THREAD_GETMEM (self, cancelhandling);

  /* Disable asynchronous cancellation for now.  */

  if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK))

    while (1)

      {

	int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,

						cancelhandling

						& ~CANCELTYPE_BITMASK,

						cancelhandling);

	if (__glibc_likely (curval == cancelhandling))

	  /* Successfully replaced the value.  */

	  break;

	/* Prepare for the next round.  */

	cancelhandling = curval;

      }

  ibuf->priv.data.canceltype = (cancelhandling & CANCELTYPE_BITMASK

				? PTHREAD_CANCEL_ASYNCHRONOUS

				: PTHREAD_CANCEL_DEFERRED);

  /* Store the new cleanup handler info.  */

  THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf);

}

void

__cleanup_fct_attribute

__pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf)

{

  struct pthread *self = THREAD_SELF;

  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;

  THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev);

  int cancelhandling;

  if (ibuf->priv.data.canceltype != PTHREAD_CANCEL_DEFERRED

      && ((cancelhandling = THREAD_GETMEM (self, cancelhandling))

	  & CANCELTYPE_BITMASK) == 0)

    {

      while (1)

	{

	  int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,

						  cancelhandling

						  | CANCELTYPE_BITMASK,

						  cancelhandling);

	  if (__glibc_likely (curval == cancelhandling))

	    /* Successfully replaced the value.  */

	    break;

	  /* Prepare for the next round.  */

	  cancelhandling = curval;

	}

      CANCELLATION_P (self);

    }

}