feat core: futures support in deadlock detector

commit_hash:b13a48f49ffb2e4fd20f6c1b46e8fde6f31f059f

Author: lexeyo

core/include/userver/engine/impl/future_state.hpp

@@ -5,6 +5,7 @@
 
 #include <userver/engine/deadline.hpp>
 #include <userver/engine/future_status.hpp>
+#include <userver/engine/impl/actor.hpp>
 #include <userver/engine/impl/context_accessor.hpp>
 #include <userver/engine/impl/wait_list_fwd.hpp>
 #include <userver/utils/result_store.hpp>
@@ -13,7 +14,7 @@ USERVER_NAMESPACE_BEGIN
 
 namespace engine::impl {
 
-class FutureStateBase : private ContextAccessor {
+class FutureStateBase : private ContextAccessor, public deadlock_detector::Actor {
 public:
     bool IsReady() const noexcept final;
 
@@ -25,6 +26,8 @@ class FutureStateBase : private ContextAccessor {
     // Internal helper for WaitAny/WaitAll
     ContextAccessor* TryGetContextAccessor() noexcept { return this; }
 
+    utils::StringLiteral GetActorType() const override { return "Future"; }
+
 protected:
     FutureStateBase() noexcept;
     ~FutureStateBase();

core/src/engine/impl/future_state.cpp

@@ -2,6 +2,7 @@
 
 #include <future>
 
+#include <engine/deadlock_detector.hpp>
 #include <engine/impl/future_utils.hpp>
 #include <engine/impl/wait_list_light.hpp>
 #include <engine/task/task_context.hpp>
@@ -24,8 +25,13 @@ FutureStatus FutureStateBase::WaitUntil(Deadline deadline) {
     }
 
     auto& context = current_task::GetCurrentTaskContext();
-
     FutureWaitStrategy wait_strategy{*this, context};
+
+    std::optional<engine::deadlock_detector::WaitScope> scope;
+    if (!deadline.IsReachable()) {
+        scope.emplace(*this);
+    }
+
     const auto wakeup_source = context.Sleep(wait_strategy, deadline);
     return ToFutureStatus(wakeup_source);
 }