Hello,
I have a strange behaviour in GNUStep. Before digging deeper, I wanted to know
if anyone has a clue.
I have this piece of code:
- (BOOL)updateViaUrl:(NSString *)url /* returns YES on success */
serial:(NSString *)serial
{
NSMutableString *full_url = [[NSMutableString alloc]init];
[full_url appendFormat:@"%@?serial=%@",url,[serial urlencode]];
NSURL *u = [[NSURL alloc]initWithString:full_url];
NSError *e= NULL;
@autoreleasepool
{
@try
{
#ifdef __APPLE__
NSData *data = [NSData dataWithContentsOfURL:u
options:NSDataReadingUncached
error:&e];
#else
NSData *data = [NSData dataWithContentsOfURL:u];
#endif
if((e==0) && (data.length > 0))
{
returnValue = YES;
}
}
@catch(NSException *e)
{
NSLog(@"Exception while pulling URL %@",full_url);
returnValue = NO;
}
}
return returnValue;
}
This gets called in a background thread in regular intervalls. Its updating a
server with some statistic by pushing some data over https://..
Here's how the process is created:
- (void)runSelectorInBackground:(SEL)aSelector
withObject:(id)anArgument
{
UMObjectThreadStarter *ts = [[UMObjectThreadStarter alloc]init];
ts.selector = aSelector;
ts.obj = anArgument;
[NSThread detachNewThreadSelector:@selector(threadStarter:)
toTarget:self
withObject:ts];
}
(threadStarter: then calls above updateViaURL at some point)
What I have seen is that on gnustep it was producing a crash. This was caused
by no autorelease pool being present as it was launched in a background thread.
@autoreleasepool {...} fixed that crash. (On MacOS X it wasnt crashing).
Now I experience some busyloops in my application _sometimes_ and whenever I
load it into the debugger I see that it is in dataWithContentsOfURL: call
To be noted is that the URL called could not be reachable intentionally (no
DNS, firewalls etc) or temporarely (no current coverage, routing issues)
For now I just disabled this code but I wondered if anyone has seen something
similar and knows a quick workaround
