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task: optimize for common case of single following Task

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If there is only one Task in the post exec queue, we can
simply insert that Task instead of creating a task to hold
a post exec queue of one item.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-06-08 00:34:35 -04:00
parent ecf110f377
commit b828f14dd1
1 changed files with 11 additions and 6 deletions
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17
lib/task.cc
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@ -199,12 +199,17 @@ namespace crucible {
tlcc->m_local_queue.splice(tlcc->m_local_queue.begin(), queue);
} else {
// We are not executing under a TaskConsumer.
// Create a new task to wrap our post-exec queue,
// then push it to the front of the global queue using normal locking methods.
TaskStatePtr rescue_task(make_shared<TaskState>("rescue_task", [](){}));
swap(rescue_task->m_post_exec_queue, queue);
TaskQueue tq_one { rescue_task };
TaskMasterState::push_front(tq_one);
// If there is only one task, then just insert it at the front of the queue.
if (queue.size() == 1) {
TaskMasterState::push_front(queue);
} else {
// If there are multiple tasks, create a new task to wrap our post-exec queue,
// then push it to the front of the global queue using normal locking methods.
TaskStatePtr rescue_task(make_shared<TaskState>("rescue_task", [](){}));
swap(rescue_task->m_post_exec_queue, queue);
TaskQueue tq_one { rescue_task };
TaskMasterState::push_front(tq_one);
}
}
}