#import <Foundation/Foundation.h>
  
  define WAIT_UNTIL_DONE_ON_UI_THREAD        NO
  
  define ENSURE_UI_THREAD_1_ARG(x)        \
  if (![NSThread isMainThread]) { \
  [self performSelectorOnMainThread:_cmd withObject:x waitUntilDone:WAIT_UNTIL_DONE_ON_UI_THREAD modes:[NSArray arrayWithObject:NSRunLoopCommonModes]]; \
  return; \
  } \
  
  define ENSURE_UI_THREAD_0_ARGS                ENSURE_UI_THREAD_1_ARG(nil)
  
  //TODO: Is there any time where @selector(x:) is not _sel (IE, the called method for 1 arg?
  //Similarly, if we already have x:withObject: as a selector in _sel, could we 
  //We may want phase out asking the method explicitly when the compiler can do it for us
  //For now, leaving it unchanged and using _X_ARG(S) to denote no method name used.
  
  define ENSURE_UI_THREAD(x,y) \
  if (![NSThread isMainThread]) { \
  [self performSelectorOnMainThread:@selector(x:) withObject:y waitUntilDone:WAIT_UNTIL_DONE_ON_UI_THREAD]; \
  return; \
  } \
  
  define ENSURE_UI_THREAD_WITH_OBJS(x,...)        \
  if (![NSThread isMainThread]) { \
  id o = [NSArray arrayWithObjects:@"" #x, ##__VA_ARGS__, nil];\
  [self performSelectorOnMainThread:@selector(_dispatchWithObjectOnUIThread:) withObject:o waitUntilDone:WAIT_UNTIL_DONE_ON_UI_THREAD]; \
  return; \
  } \
  
  define ENSURE_UI_THREAD_WITH_OBJ(x,y,z) \
  ENSURE_UI_THREAD_WITH_OBJS(x,NULL_IF_NIL(y),NULL_IF_NIL(z))
  
  define BEGIN_UI_THREAD_PROTECTED_VALUE(method,type) \
  -(id)_sync_##method:(NSMutableArray*)array_\
  {\
  \
  type* result = nil;\
  \
  
  define END_UI_THREAD_PROTECTED_VALUE(method) \
  if (array_!=nil)[array_ addObject:result];\
  return result;\
  }\
  -(id)method\
  {\
  if (![NSThread isMainThread])\
  {\
  NSMutableArray *array = [NSMutableArray array];\
  [self performSelectorOnMainThread:@selector(_sync_##method:) withObject:array waitUntilDone:YES];\
  return [array objectAtIndex:0];\
  }\
  return [self _sync_##method:nil];\
  \
  }\
  
  ifdef VERBOSE
  
  define WARN_IF_BACKGROUND_THREAD        \
  if(![NSThread isMainThread])        \
  {        \
          NSLog(@"[WARN] %@ not running on the main thread.",CODELOCATION);        \
  }        \
  
  define WARN_IF_BACKGROUND_THREAD_OBJ        \
  if(![NSThread isMainThread])        \
  {        \
          NSLog(@"[WARN] %@%@ was not running on the main thread.",NSStringFromClass([self class]),CODELOCATION);        \
  }        \
  
  else
  
  define WARN_IF_BACKGROUND_THREAD        {}
  define WARN_IF_BACKGROUND_THREAD_OBJ        {}
  
  endif //VERBOSE