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30f098f9f8
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@31765 72102866-910b-0410-8b05-ffd578937521
100 lines
2.5 KiB
Objective-C
100 lines
2.5 KiB
Objective-C
/* Implementation of extension methods to base additions
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Copyright (C) 2010 Free Software Foundation, Inc.
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Written by: Richard Frith-Macdonald <rfm@gnu.org>
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This file is part of the GNUstep Base 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 Lesser 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 Lesser General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02111 USA.
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*/
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#import "common.h"
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#import "Foundation/NSException.h"
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#import "GNUstepBase/NSLock+GNUstepBase.h"
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#import "GNUstepBase/GSLock.h"
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/**
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* GNUstep specific (non-standard) additions to the NSLock class.
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*/
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static GSLazyRecursiveLock *local_lock = nil;
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/* This class only exists to provide a thread safe mechanism to
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initialize local_lock as +initialize is called under a lock in ObjC
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runtimes. User code should resort to GS_INITIALIZED_LOCK(), which
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uses the +newLockAt: extension. */
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@interface _GSLockInitializer : NSObject
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@end
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@implementation _GSLockInitializer
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+ (void) initialize
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{
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if (local_lock == nil)
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{
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/* As we do not know whether creating custom locks may
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implicitly create other locks, we use a recursive lock. */
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local_lock = [GSLazyRecursiveLock new];
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}
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}
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@end
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static inline id
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newLockAt(Class self, SEL _cmd, id *location)
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{
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if (location == 0)
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{
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[NSException raise: NSInvalidArgumentException
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format: @"'%@' called with nil location",
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NSStringFromSelector(_cmd)];
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}
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if (*location == nil)
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{
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if (local_lock == nil)
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{
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[_GSLockInitializer class];
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}
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[local_lock lock];
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if (*location == nil)
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{
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*location = [[(id)self alloc] init];
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}
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[local_lock unlock];
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}
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return *location;
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}
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@implementation NSLock (GNUstepBase)
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+ (id) newLockAt: (id *)location
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{
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return newLockAt(self, _cmd, location);
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}
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@end
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@implementation NSRecursiveLock (GNUstepBase)
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+ (id) newLockAt: (id *)location
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{
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return newLockAt(self, _cmd, location);
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}
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@end
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