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/*
* cleanup.c
*
* Description:
* This translation unit implements routines associated
* with cleaning up threads.
*
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2012 Pthreads-win32 contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This 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 of the License, or (at your option) any later version.
*
* This 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 this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "pthread.h"
#include "implement.h"


/*
* The functions ptw32_pop_cleanup and ptw32_push_cleanup
* are implemented here for applications written in C with no
* SEH or C++ destructor support.
*/

ptw32_cleanup_t *
ptw32_pop_cleanup (int execute)
     /*
* ------------------------------------------------------
* DOCPUBLIC
* This function pops the most recently pushed cleanup
* handler. If execute is nonzero, then the cleanup handler
* is executed if non-null.
*
* PARAMETERS
* execute
* if nonzero, execute the cleanup handler
*
*
* DESCRIPTION
* This function pops the most recently pushed cleanup
* handler. If execute is nonzero, then the cleanup handler
* is executed if non-null.
* NOTE: specify 'execute' as nonzero to avoid duplication
* of common cleanup code.
*
* RESULTS
* N/A
*
* ------------------------------------------------------
*/
{
  ptw32_cleanup_t *cleanup;

  cleanup = (ptw32_cleanup_t *) pthread_getspecific (ptw32_cleanupKey);

  if (cleanup != NULL)
    {
      if (execute && (cleanup->routine != NULL))
{

(*cleanup->routine) (cleanup->arg);

}

      pthread_setspecific (ptw32_cleanupKey, (void *) cleanup->prev);

    }

  return (cleanup);

} /* ptw32_pop_cleanup */


void
ptw32_push_cleanup (ptw32_cleanup_t * cleanup,
ptw32_cleanup_callback_t routine, void *arg)
     /*
* ------------------------------------------------------
* DOCPUBLIC
* This function pushes a new cleanup handler onto the thread's stack
* of cleanup handlers. Each cleanup handler pushed onto the stack is
* popped and invoked with the argument 'arg' when
* a) the thread exits by calling 'pthread_exit',
* b) when the thread acts on a cancellation request,
* c) or when the thread calls pthread_cleanup_pop with a nonzero
* 'execute' argument
*
* PARAMETERS
* cleanup
* a pointer to an instance of pthread_cleanup_t,
*
* routine
* pointer to a cleanup handler,
*
* arg
* parameter to be passed to the cleanup handler
*
*
* DESCRIPTION
* This function pushes a new cleanup handler onto the thread's stack
* of cleanup handlers. Each cleanup handler pushed onto the stack is
* popped and invoked with the argument 'arg' when
* a) the thread exits by calling 'pthread_exit',
* b) when the thread acts on a cancellation request,
* c) or when the thrad calls pthread_cleanup_pop with a nonzero
* 'execute' argument
* NOTE: pthread_push_cleanup, ptw32_pop_cleanup must be paired
* in the same lexical scope.
*
* RESULTS
* pthread_cleanup_t *
* pointer to the previous cleanup
*
* ------------------------------------------------------
*/
{
  cleanup->routine = routine;
  cleanup->arg = arg;

  cleanup->prev = (ptw32_cleanup_t *) pthread_getspecific (ptw32_cleanupKey);

  pthread_setspecific (ptw32_cleanupKey, (void *) cleanup);

} /* ptw32_push_cleanup */
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