opstart

Context(s)	shading

int  opstart(string message)

Inform mantra about the start of a long operation (operation start). The string argument is passed to mantra and may be displayed in the IPR viewer.

The function will return a non-negative integer when successfully started.

The integer returned should be passed to opend() at the completion of the long operation.

int started = opstart("Performing long operation");
perform_long_operation();
if (started >= 0)
opend(started);