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  • XMPPElementReceipt wait return,

    #pragma mark -

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

     

    @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

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  • 原文地址:https://www.cnblogs.com/guligei/p/3513879.html
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