NSURLConnection's scheduleInRunLoop:forMode: not working
NSURLConnection's scheduleInRunLoop:forMode: not working
- Subject: NSURLConnection's scheduleInRunLoop:forMode: not working
- From: Jens Alfke <email@hidden>
- Date: Tue, 09 Aug 2011 10:36:53 -0700
| I have a situation where I need to block until an already-running asynchronous NSURLConnection completes. I block by spinning a nested runloop until my delegate gets notified of completion. To avoid nasty reentrancy issues, I do the blocking in a custom runloop mode — that ensures no other actions happen on this thread while I’m waiting (timers, other NSURLConnections, etc.)
The problem is that I can’t seem to schedule the connection into my custom mode — the scheduleInRunLoop:forMode: call has no effect, even though the docs say that it’s OK to call it on an already-started connection. I can tell it has no effect because the runloop’s -runMode:beforeDate: exits immediately returning NO, which implies that there are no input sources for my custom mode. (On the other hand, -scheduleInRunLoop:forMode: works just fine if I call it before starting the connection.)
The connection is started asynchronously like so:
_connection = [[NSURLConnection alloc] initWithRequest: _request delegate: self startImmediately: NO]; [_connection scheduleInRunLoop: [NSRunLoop currentRunLoop] forMode: NSRunLoopCommonModes]; [_connection start];
Here’s the bit of code (down in another method) that blocks.
[_connection scheduleInRunLoop: [NSRunLoop currentRunLoop] forMode: kRESTObjectRunLoopMode]; while (_connection && _state == kRESTObjectLoading) { if (![[NSRunLoop currentRunLoop] runMode: kRESTObjectRunLoopMode beforeDate: [NSDate distantFuture]]) break; }
(I’m on Lion, 10.7.0.)
—Jens |
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