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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@24 72102866-910b-0410-8b05-ffd578937521
127 lines
2.9 KiB
Objective-C
127 lines
2.9 KiB
Objective-C
/* Implementation of retaining/releasing for object disposal and ref counting
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Copyright (C) 1994 Free Software Foundation, Inc.
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Written by: R. Andrew McCallum <mccallum@gnu.ai.mit.edu>
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Date: August 1994
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This file is part of the GNU Objective C Class Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <objects/ObjectRetaining.h>
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#include <objects/collhash.h>
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#include <objects/eltfuncs.h>
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#include <objects/objc-malloc.h>
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#include <objects/AutoreleasePool.h>
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#include <limits.h>
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/* Doesn't handle multi-threaded stuff.
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Doesn't handle exceptions. */
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/* The hashtable of retain counts on objects */
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static coll_cache_ptr retain_counts = NULL;
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/* The Class responsible for handling autorelease's */
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id autorelease_class = nil;
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static void
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init_retain_counts_if_necessary()
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{
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/* Initialize if we haven't done it yet */
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if (!retain_counts)
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{
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retain_counts = coll_hash_new(64,
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(coll_hash_func_type)
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elt_hash_void_ptr,
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(coll_compare_func_type)
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elt_compare_void_ptrs);
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}
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}
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void
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objc_retain_object (id anObj)
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{
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coll_node_ptr n;
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init_retain_counts_if_necessary();
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n = coll_hash_node_for_key(retain_counts, anObj);
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if (n)
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(n->value.unsigned_int_u)++;
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else
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coll_hash_add(&retain_counts, anObj, (unsigned)1);
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}
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void
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objc_release_object (id anObj)
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{
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coll_node_ptr n;
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init_retain_counts_if_necessary();
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n = coll_hash_node_for_key(retain_counts, anObj);
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if (n)
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{
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(n->value.unsigned_int_u)--;
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if (n->value.unsigned_int_u)
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return;
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coll_hash_remove(retain_counts, anObj);
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}
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[anObj dealloc];
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}
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/* Careful, this doesn't include autoreleases */
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unsigned
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objc_retain_count (id anObj)
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{
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coll_node_ptr n;
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init_retain_counts_if_necessary();
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n = coll_hash_node_for_key(retain_counts, anObj);
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if (n)
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return n->value.unsigned_int_u;
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else
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return 0;
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}
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@implementation Object (RetainingObject)
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- retain
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{
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objc_retain_object(self);
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return self;
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}
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- (oneway void) release
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{
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objc_release_object(self);
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}
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- (void) dealloc
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{
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object_dispose(self);
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}
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- (unsigned) retainCount
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{
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return objc_retain_count(self);
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}
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- autorelease
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{
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[autorelease_class autoreleaseObject:self];
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return self;
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}
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@end
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