| Function silc_async_halt
 
 SYNOPSIS
 
    SilcBool silc_async_halt(SilcAsyncOperation op);
DESCRIPTION
    Halt the execution of the asynchronous operation.  If the operation
    supports this feature, it is guaranteed that the operation is halted
    and its execution is not progressed until the silc_async_resume function
    is called.  The operation still can be aborted even if it is halted.
    If this function is not supported, calling this has no effect and the
    function returns FALSE.  This function is for the upper layer that
    controls the asynchronous operation.
 
 
 
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