//
//  TestPthreadStackLocal.m
//  mulle-singleton-comparison
//
//  Created by Nat! on 12.08.2014
//
//  Copyright (c) 2014 Nat! - Mulle kybernetiK
//  All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//
//  Redistributions of source code must retain the above copyright notice, this
//  list of conditions and the following disclaimer.
//
//  Redistributions in binary form must reproduce the above copyright notice,
//  this list of conditions and the following disclaimer in the documentation
//  and/or other materials provided with the distribution.
//
//  Neither the name of Mulle kybernetiK nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
//  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
//  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
//  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
//  POSSIBILITY OF SUCH DAMAGE.
//

#import <Foundation/Foundation.h>
#import <pthread.h>


@interface TestPthreadLocal : NSObject
@end


@implementation TestPthreadLocal

static pthread_key_t   singletonKey;

#if ! __has_feature( objc_arc)

static void   threadDestructor( void *value)
{
   [(id) value release];
   pthread_setspecific( singletonKey, NULL);
}


+ (id) sharedInstance
{
   id   sharedInstance;
   
   sharedInstance = (id) pthread_getspecific( singletonKey);
   if( ! sharedInstance)
   {
      sharedInstance = [self new];
      pthread_setspecific( singletonKey, sharedInstance);
   }
   return( sharedInstance);
}

#else

// ARC makes it so much more convenient
static pthread_key_t   singletonKey;


static void   threadDestructor( void *value)
{
   CFBridgingRelease( value);
   pthread_setspecific( singletonKey, NULL);
}


+ (id) sharedInstance
{
   id   sharedInstance;
   
   sharedInstance = (__bridge id) pthread_getspecific( singletonKey);
   if( ! sharedInstance)
   {
      sharedInstance = [self new];
      pthread_setspecific( singletonKey, CFBridgingRetain( sharedInstance));
   }
   return( sharedInstance);
}

#endif


+ (void) load
{
   if( pthread_key_create( &singletonKey, threadDestructor))
   {
      NSLog( @"pthread_key_create %s", strerror( errno));
      abort();
   }
}

@end