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/* Interface for NSAutoreleasePool for GNUStep
   Copyright (C) 1995, 1996 Free Software Foundation, Inc.

   Written by:  Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
   Date: 1995
   
   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library 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
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */ 

#ifndef __NSAutoreleasePool_h_GNUSTEP_BASE_INCLUDE
#define __NSAutoreleasePool_h_GNUSTEP_BASE_INCLUDE

#include <gnustep/base/preface.h>
#include <string.h>		/* for memset() */

@class NSAutoreleasePool;


/* Each thread has its own copy of these variables.
   A pointer to this structure is an ivar of NSThread. */
struct autorelease_thread_vars
{
  /* The current, default NSAutoreleasePool for the calling thread;
     the one that will hold objects that are arguments to
     [NSAutoreleasePool +addObject:]. */
  NSAutoreleasePool *current_pool;

  /* The total number of objects autoreleased since the thread was
     started, or since -resetTotalAutoreleasedObjects was called
     in this thread. */
  unsigned total_objects_count;

  /* A cache of NSAutoreleasePool's already alloc'ed.  Caching old pools
     instead of deallocating and re-allocating them will save time. */
  id *pool_cache;
  int pool_cache_size;
  int pool_cache_count;
};

/* Initialize an autorelease_thread_vars structure for a new thread.
   This function is called in NSThread each time an NSThread is created. */
static inline void
init_autorelease_thread_vars (struct autorelease_thread_vars *tv)
{
  memset (tv, 0, sizeof (typeof (*tv)));
}


/* Each pool holds its objects-to-be-released in a linked-list of 
   these structures. */
struct autorelease_array_list
{
  struct autorelease_array_list *next;
  unsigned size;
  unsigned count;
  id objects[0];
};


@interface NSAutoreleasePool : NSObject 
{
  /* For re-setting the current pool when we are dealloc'ed. */
  NSAutoreleasePool *_parent;
  /* This pointer to our child pool is  necessary for co-existing
     with exceptions. */
  NSAutoreleasePool *_child;
  /* A collection of the objects to be released. */
  struct autorelease_array_list *_released;
  struct autorelease_array_list *_released_head;
  /* The total number of objects autoreleased in this pool. */
  unsigned _released_count;
}

+ (void)addObject: anObject;
- (void)addObject: anObject;

+ (void) enableRelease: (BOOL)enable;
+ (void) setPoolCountThreshhold: (unsigned)c;
+ (unsigned) autoreleaseCountForObject: anObject;
+ (void) resetTotalAutoreleasedObjects;
+ (unsigned) totalAutoreleasedObjects;

@end

#endif /* __NSAutoreleasePool_h_GNUSTEP_BASE_INCLUDE */

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