Information Returned by Functions
An application receives two kinds of information as a result of a function
call: the function's return value, and values written to data locations specified
by the function's arguments.
If the function's return value is zero, the application knows that the
function has completed synchronously. In this case, any values written as a result of
the function call are reliable and can be used immediately. However, if the
return value is positive, the function has not yet completed but it will complete
asynchronously, at which time TAPI notifies the application by sending it an
asynchronous reply message for the function. Once the application receives this
message (and the message indicates success), any values returned by the function
are considered to be reliable. However, before the message is received, the
application should consider these values suspect and should not use them. Also,
because asynchronous reply messages can take varying lengths of time to be sent,
the application may not receive them in the same order in which it called
their functions. This is why an application must retain the request IDs of its
requests in progress so that it can identify and correctly respond to incoming
asynchronous reply messages.
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