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Ell authored
Remove the "independent" parameter of gimp_parallel_run_async(), and have the function always execute the passed callback in the shared async thread-pool. Add a new gimp_parallel_run_async_full() function, taking, in addition to a callback and a data pointer: - A priority value, controlling the priority of the callback in the async thread-pool queue. 0 is the default priority (used by gimp_parallel_run_async()), negative values have higher priority, and positive values have lower priority. - A destructor function for the data pointer. This function is called to free the user data in case the async operation is canceled before execution of the callback function begins, and the operation is dropped from the queue and aborted without executing the callback. Note that if the callback *is* executed, the destructor is *not* used -- it's the callback's responsibility to free/recycle the user data. Add a separate gimp_parallel_run_async_independent() function, taking the same parameters, and executing the passed callback in an independent thread, rather than the thread pool. This function doesn't take a priority value or a destructor (and there's no corresponding "_full()" variant that does), since they're pointless for independent threads. Adapt the rest of the code to the changes.
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