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2bb071a950
Using callgrind with the standalone test showed opportunities for improvements for sub tasks addition and drain. All sub task additions were performed after making sure we were operating on a Context Task. The Context and Task were checked again when adding the sub task. Draining sub tasks was perfomed in a loop on every call places, checking whether there were remaining sub tasks first. This commit implements the loop and checks directly in `executor::Task::drain_subtasks`, saving one `Mutex` lock and one `thread_local` access per iteration when there are sub tasks to drain. The `PadSink` functions wrapper were performing redundant checks on the `Context` presence and were adding the delayed Future only when there were already sub tasks. |
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| sink | ||
| src | ||
| main.rs | ||