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The message progress callback is invoked whenever there is some progress to report for the outgoing message. It is also invoked when the message has been completely sent or when it was abandoned due to communication problem in the given channel. This callback is installed when the message is posted.
In Ada the callback interface is defined in the YAMI.Core.Message_Progress_Handlers
package.
In C++ the callback signature is defined by message_progress_function
.