Merge pull request ClickHouse#68694 from filimonov/thread_pool_thread_creation_out_of_lock

Thread pool: move thread creation out of lock

Author: serxa

src/Common/AsyncLoader.cpp

@@ -51,12 +51,12 @@ AsyncLoader::Pool::Pool(const AsyncLoader::PoolInitializer & init)
     , priority(init.priority)
     , max_threads(init.max_threads > 0 ? init.max_threads : getNumberOfPhysicalCPUCores())
     , thread_pool(std::make_unique<ThreadPool>(
-        init.metric_threads,
-        init.metric_active_threads,
-        init.metric_scheduled_threads,
-        /* max_threads = */ std::numeric_limits<size_t>::max(), // Unlimited number of threads, we do worker management ourselves
-        /* max_free_threads = */ 0, // We do not require free threads
-        /* queue_size = */0)) // Unlimited queue to avoid blocking during worker spawning
+          init.metric_threads,
+          init.metric_active_threads,
+          init.metric_scheduled_threads,
+          /* max_threads = */ ThreadPool::MAX_THEORETICAL_THREAD_COUNT, // Unlimited number of threads, we do worker management ourselves
+          /* max_free_threads = */ 0, // We do not require free threads
+          /* queue_size = */ 0)) // Unlimited queue to avoid blocking during worker spawning
 {}
 
 AsyncLoader::Pool::Pool(Pool&& o) noexcept