Counter callback, informs the progress of the operation to the client. \n * Text contains a constant string that is NULL during normal counting, a title in the begining of a sequence * and a message in the begining of a count. * Counter id identifies diferrent counters. \n * Progress in a count reports a value from 0 to 1000. * If -1 indicates the start of a sequence of operations, 1001 ends the sequence. \n * If returns 0 the client should abort the operation. \n * If the counter is aborted, the callback will be called one last time at 1001. * \ingroup counter
Begins a new count, or a partial-count in a sequence. \n * Calls the callback with "-1" and text=title, if it is at the top level. \n * This is to be used by the operations. Returns a counter Id. * \ingroup counter
Ends a count, or a partial-count in a sequence. \n * Calls the callback with "1001", text=null, and releases the counter if it is at top level count. \n * \ingroup counter
Sets an additional user data in the counter. * Used to save the lock in multi-threaded configurations. * \ingroup counter
Returns true if the counter callback is set. * When the callback is NULL the counter is inactive and all functions do nothing. * \ingroup counter
Increments a count. Must set the total first. \n * Calls the callback, text=message if it is the first increment for the count. \n * Returns 0 if the callback aborted, 1 if returns normally. * \ingroup counter
Set a specific count. Must set the total first. \n * Calls the callback, text=message if it is the first increment for the count. \n * Returns 0 if the callback aborted, 1 if returns normally. * \ingroup counter
Changes the counter callback. Returns old callback. \n * User data is changed only if not NULL. * \ingroup counter
Returns the additional user data in the counter. * \ingroup counter
Sets the total increments of a count. * \ingroup counter
\file \brief Processing Counter
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