how we make persistentStoreCoordinator synchronize in objective c - objective-c

Question

I am new in objective c and I want to know how we make persistentStoreCoordinator #synchronize to make methods thread safe. It's crash, i can clearly see crash reason on sigabort
This NSPersistentStoreCoordinator has no persistent stores (unknown). It cannot perform a save operation.
Please provide me any link or sample where we can check persistentStoreCoordinator is synchronize.
Any help is appreciated. Thanks in advance.
-(NSManagedObjectContext *)managedObjectContext
{
#try{
if (__managedObjectContext != nil) {
return __managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
__managedObjectContext = [[NSManagedObjectContext alloc] init];
[__managedObjectContext setPersistentStoreCoordinator:coordinator];
}
return __managedObjectContext;
}
#catch(NSException *exception){
NSLog(#"Exception managedObjectContext : %#", exception);
}
}
-(NSManagedObjectModel *)managedObjectModel
{
#try{
if (__managedObjectModel != nil) {
return __managedObjectModel;
}
NSString *modelPath = [[NSBundle mainBundle] pathForResource:DBNAME ofType:#"momd"];
if([[TrackerUtility TrackerUtilityManager] getDebugMode]){
NSLog(#"modelPath %#",modelPath);
}
NSURL *modelURL = [NSURL fileURLWithPath:modelPath];
__managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return __managedObjectModel;
}
#catch(NSException *exception){
NSLog(#"Exception managedObjectModel : %#",exception);
}
}
-(NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
#try{
if (__persistentStoreCoordinator != nil) {
return __persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:[NSString stringWithFormat:#"%#.sqlite", DBNAME]];
NSError *error = nil;
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
NSDictionary *options = #{
NSMigratePersistentStoresAutomaticallyOption : #YES,
NSInferMappingModelAutomaticallyOption : #YES
};
if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
if([[TrackerUtility TrackerUtilityManager] getDebugMode]){
NSLog(#"persistentStoreCoordinator error %#, %#", error, [error userInfo]);
}
abort();
}
return __persistentStoreCoordinator;
}
#catch(NSException *exception){
NSLog(#"Exception persistentStoreCoordinator : %#",exception);
}
}
(NSURL *)applicationDocumentsDirectory
{
#try{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}
#catch(NSException *exception){
NSLog(#"Exception applicationDocumentsDirectory : %#",exception);
}
}