gistfile1.m

NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:@selector(listWithOffset:limit:)]];
[theInvocation setSelector:@selector(listWithOffset:limit:)];
[theInvocation setTarget:self];
NSInteger offset = 40;
[theInvocation setArgument:&offset atIndex:2];
NSInteger limit = 20;
[theInvocation setArgument:&limit atIndex:3];
[invocation performSelector:@selector(invoke) onThread:thread withObject:nil waitUntilDone:NO];