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64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
#pragma once
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#include <Common/ThreadPool.h>
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#include <Common/scope_guard_safe.h>
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#include <Common/CurrentThread.h>
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#include <Common/setThreadName.h>
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#include <future>
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namespace DB
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{
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/// High-order function to run callbacks (functions with 'void()' signature) somewhere asynchronously.
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template <typename Result, typename Callback = std::function<Result()>>
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using ThreadPoolCallbackRunner = std::function<std::future<Result>(Callback &&, Priority)>;
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/// Creates CallbackRunner that runs every callback with 'pool->scheduleOrThrowOnError()'.
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template <typename Result, typename Callback = std::function<Result()>>
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ThreadPoolCallbackRunner<Result, Callback> threadPoolCallbackRunner(ThreadPool & pool, const std::string & thread_name)
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{
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return [my_pool = &pool, thread_group = CurrentThread::getGroup(), thread_name](Callback && callback, Priority priority) mutable -> std::future<Result>
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{
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auto task = std::make_shared<std::packaged_task<Result()>>([thread_group, thread_name, my_callback = std::move(callback)]() mutable -> Result
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{
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if (thread_group)
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CurrentThread::attachToGroup(thread_group);
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SCOPE_EXIT_SAFE({
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{
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/// Release all captutred resources before detaching thread group
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/// Releasing has to use proper memory tracker which has been set here before callback
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[[maybe_unused]] auto tmp = std::move(my_callback);
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}
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if (thread_group)
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CurrentThread::detachFromGroupIfNotDetached();
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});
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setThreadName(thread_name.data());
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return my_callback();
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});
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auto future = task->get_future();
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/// ThreadPool is using "bigger is higher priority" instead of "smaller is more priority".
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/// Note: calling method scheduleOrThrowOnError in intentional, because we don't want to throw exceptions
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/// in critical places where this callback runner is used (e.g. loading or deletion of parts)
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my_pool->scheduleOrThrowOnError([my_task = std::move(task)]{ (*my_task)(); }, priority);
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return future;
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};
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}
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template <typename Result, typename T>
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std::future<Result> scheduleFromThreadPool(T && task, ThreadPool & pool, const std::string & thread_name, Priority priority = {})
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{
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auto schedule = threadPoolCallbackRunner<Result, T>(pool, thread_name);
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return schedule(std::move(task), priority);
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}
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}
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