App crashes when multiple files "write to file" simultaneously.

Question

Here is my code.

- (void) connectionDidFinishLoading: (NSURLConnection *) connection

{
    //Each connection has its own "downloadedData".
    BOOL writeFlag = [downloadedData writeToFile: filePath atomically: YES];
}

I have multiple NSURLConnections at the same time.Each connection corresponds to one download item.App crashes when multiple downloads finish at the same time.Is this method thread-safe?

It says:

_serverConnectionDiedNotification. Info -- notification=NSConcreteNotification 0x11d90470{name = AVController_ServerConnectionDiedNotification; object = <AVController: 0x11d855a0>},
 AVController = <AVController: 0x11d855a0>,currentTime = 0.00

Program received signal:  “0”.
warning: check_safe_call: could not restore current frame

THANKS!

Answer 1

I assume downloadedData is not shared between the different requests? Because that would probably not be a good idea.

I use the ASI-HTTPRequest library for my http request needs. It's easy to do things like asynchronous requests right. You might find it useful.

Answer 2

OK,I figure out myself.Besides downloadedData, I have a few arrays and dictionarys pair with each unique connection. Seems like I didn't take care of those collections carefully enough. When I clear this mess up,phew,problems are gone!