XMPPElementReceipt wait return，

#pragma mark -

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@interface XMPPElementReceipt : NSObject

{

uint32_t atomicFlags;

dispatch_semaphore_t semaphore;

}

 

/**

 * Element receipts allow you to check to see if the element has been sent.

 * The timeout parameter allows you to do any of the following:

 * 

 * - Do an instantaneous check (pass timeout == 0)

 * - Wait until the element has been sent (pass timeout < 0)

 * - Wait up to a certain amount of time (pass timeout > 0)

 * 

 * It is important to understand what it means when [receipt wait:timeout] returns YES.

 * It does NOT mean the server has received the element.

 * It only means the data has been queued for sending in the underlying OS socket buffer.

 * 

 * So at this point the OS will do everything in its capacity to send the data to the server,

 * which generally means the server will eventually receive the data.

 * Unless, of course, something horrible happens such as a network failure,

 * or a system crash, or the server crashes, etc.

 * 

 * Even if you close the xmpp stream after this point, the OS will still do everything it can to send the data.

**/

- (BOOL)wait:(NSTimeInterval)timeout;

 

@end