我有一个 iPhone 应用程序,在保存 CoreData 时有时会冻结,然后不会重新启动。我确实有第二个线程使用数据库,但我认为我已经遵循该模式为该线程创建单独的上下文。这是重新启动后的崩溃报告。有任何想法吗?
我尝试将其更改为仅使用一个线程运行,这是进入后台后的最新冻结点。
#0 0x30851b98 in fsync
#1 0x3094e694 in _sqlite3_purgeEligiblePagerCacheMemory
#2 0x3094e6b8 in _sqlite3_purgeEligiblePagerCacheMemory
#3 0x30945372 in sqlite3_compileoption_get
#4 0x30957f06 in sqlite3_extended_errcode
#5 0x3095dc20 in sqlite3_extended_errcode
#6 0x3095dd8e in sqlite3_extended_errcode
#7 0x309646f8 in sqlite3_clear_bindings
#8 0x3098845a in sqlite3_open16
#9 0x3094495a in sqlite3_step
#10 0x31a1dc20 in _execute
#11 0x31acc6e8 in -[NSSQLiteConnection commitTransaction]
#12 0x31aca646 in -[NSSQLiteConnection endPrimaryKeyGeneration]
#13 0x31abeab4 in -[NSSQLCore prepareForSave:]
#14 0x31a4acd0 in -[NSSQLCore saveChanges:]
#15 0x31a1591e in -[NSSQLCore executeRequest:withContext:error:]
#16 0x31a1538a in -[NSPersistentStoreCoordinator executeRequest:withContext:error:]
#17 0x31a48544 in -[NSManagedObjectContext save:]
#18 0x000080aa in -[KPersistence saveManagedObjects:] at KPersistence.m:242
#19 0x00004320 in -[KinKastAppDelegate applicationDidEnterBackground:] at KinKastAppDelegate.m:126
这是我的 saveManagedObjects 实现
-(BOOL)saveManagedObjects:(NSError **)error
{
[persistentStoreCoordinator lock];
BOOL success = YES;
if (managedObjectContext != nil) {
if ([managedObjectContext hasChanges] && ![managedObjectContext save:error]) {
VLog(@"Unresolved error %@, %@", *error, [*error userInfo]);
success = NO;
}
}
[persistentStoreCoordinator unlock];
return success;
}
当从多个线程使用 Core Data 时,请确保在保存操作之前锁定 PSC:
[self.persistentStoreCoordinator lock];
NSManagedObjectContext *context = //your context;
[context save:&error];
if (error) {
// handle error
}
[self.persistentStoreCoordinator unlock];
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