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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@173 72102866-910b-0410-8b05-ffd578937521
138 lines
3 KiB
Objective-C
138 lines
3 KiB
Objective-C
/* Implementation of reference-counted invalidation notifer object
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Copyright (C) 1993,1994 Free Software Foundation, Inc.
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Written by: R. Andrew McCallum <mccallum@gnu.ai.mit.edu>
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Date: July 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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/* Reference Counted object with invalidation notification
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This object is just temporary. Eventually, we should separate
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reference counting functionality from notification functionality */
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#include <objects/RetainingNotifier.h>
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#include <objects/InvalidationListening.h>
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#include <assert.h>
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/* Use this for now, but GNU should switch to a GC pool
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and separate notification. */
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/* I really need to check the use of locks here */
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@implementation RetainingNotifier
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- init
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{
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retain_count = 0;
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isValid = YES;
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refGate = [[Lock alloc] init];
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notificationList = [[List alloc] init];
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return self;
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}
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- (void) dealloc
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{
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[refGate release];
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[notificationList free];
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[super dealloc];
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}
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- (oneway void) release
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{
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[refGate lock];
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if (retain_count--)
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{
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[refGate unlock];
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return;
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}
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[refGate unlock];
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[self dealloc];
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return;
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}
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- (id) retain
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{
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[refGate lock];
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retain_count++;
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[refGate unlock];
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return self;
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}
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- (unsigned) retainCount
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{
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return retain_count;
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}
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/* xxx Deal with this. */
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- autorelease
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{
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return [super autorelease];
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}
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- registerForInvalidationNotification: (id <InvalidationListening>)anObject
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{
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assert(refGate);
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[refGate lock];
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[notificationList addObjectIfAbsent: anObject];
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[refGate unlock];
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return self;
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}
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- unregisterForInvalidationNotification: (id <InvalidationListening>)anObject
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{
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assert(refGate);
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[refGate lock];
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[notificationList removeObject: anObject];
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[refGate unlock];
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return self;
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}
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- (BOOL) isValid
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{
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return isValid;
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}
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/* change name to -postInvalidation */
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- invalidate
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{
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if (isValid == NO)
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return nil;
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[refGate lock];
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isValid = NO;
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[notificationList makeObjectsPerform:@selector(senderIsInvalid:) with:self];
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[refGate unlock];
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return self;
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}
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- copy
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{
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RetainingNotifier *newCopy = nil;
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if (isValid)
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{
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[refGate lock];
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newCopy = [[[self class] alloc] init];
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[newCopy->notificationList appendList:notificationList];
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newCopy->retain_count = retain_count;
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[refGate unlock];
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}
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return newCopy;
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}
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@end
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