diff --git a/cmake/netlib_features.cmake b/cmake/netlib_features.cmake
index d925385..962ce11 100644
--- a/cmake/netlib_features.cmake
+++ b/cmake/netlib_features.cmake
@@ -20,3 +20,21 @@ if(NETLIB_HAS_STD_EXECUTION)
 else()
     message(STATUS "netlib: NETLIB_HAS_STD_EXECUTION=OFF (fallback backend)")
 endif()
+
+check_cxx_source_compiles(
+    "
+#include <functional>
+int main() {
+    std::move_only_function<void()> f;
+    (void)f;
+    return 0;
+}
+"
+    NETLIB_HAS_MOVE_ONLY_FUNCTION
+)
+
+if(NETLIB_HAS_MOVE_ONLY_FUNCTION)
+    message(STATUS "netlib: std::move_only_function доступен")
+else()
+    message(STATUS "netlib: std::move_only_function недоступен — polyfill через -include")
+endif()
diff --git a/cmake/netlib_target.cmake b/cmake/netlib_target.cmake
index 3eaaa1d..b514659 100644
--- a/cmake/netlib_target.cmake
+++ b/cmake/netlib_target.cmake
@@ -11,6 +11,10 @@ target_include_directories(netlib INTERFACE
 
 target_compile_features(netlib INTERFACE cxx_std_${NETLIB_CXX_STANDARD})
 
+if(NOT NETLIB_HAS_MOVE_ONLY_FUNCTION)
+    target_compile_definitions(netlib INTERFACE NETLIB_POLYFILL_MOVE_ONLY_FUNCTION=1)
+endif()
+
 if(NETLIB_ENABLE_COROUTINES)
     target_compile_definitions(netlib INTERFACE NETLIB_ENABLE_COROUTINES=1)
     message(STATUS "netlib: NETLIB_ENABLE_COROUTINES=ON")
diff --git a/include/netlib/detail/move_only_function.hpp b/include/netlib/detail/move_only_function.hpp
new file mode 100644
index 0000000..2c76a81
--- /dev/null
+++ b/include/netlib/detail/move_only_function.hpp
@@ -0,0 +1,77 @@
+#pragma once
+
+// Polyfill std::move_only_function when the standard library does not provide it
+// (e.g. libc++ on Apple Clang in CI). Included from headers that use std::move_only_function.
+
+#include <functional>
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include <version>
+
+#if !defined(NETLIB_POLYFILL_MOVE_ONLY_FUNCTION) && defined(__cpp_lib_move_only_function) \
+    && (__cpp_lib_move_only_function >= 202110L)
+// std::move_only_function is available.
+#else
+
+namespace rrmode::netlib::detail {
+
+template<typename>
+class move_only_function;
+
+template<typename R, typename... Args>
+class move_only_function<R(Args...)> {
+    struct impl_base {
+        virtual ~impl_base() = default;
+        virtual R call(Args... args) = 0;
+    };
+
+    template<typename F>
+    struct impl final : impl_base {
+        F fn;
+
+        explicit impl(F&& f) : fn(std::move(f)) {}
+
+        R call(Args... args) override {
+            if constexpr (std::is_void_v<R>) {
+                fn(std::forward<Args>(args)...);
+            } else {
+                return fn(std::forward<Args>(args)...);
+            }
+        }
+    };
+
+    std::unique_ptr<impl_base> impl_{};
+
+public:
+    move_only_function() noexcept = default;
+
+    move_only_function(std::nullptr_t) noexcept {}
+
+    move_only_function(move_only_function&& other) noexcept = default;
+    move_only_function& operator=(move_only_function&& other) noexcept = default;
+
+    move_only_function(move_only_function const&) = delete;
+    move_only_function& operator=(move_only_function const&) = delete;
+
+    template<typename F>
+        requires std::is_invocable_r_v<R, F&, Args...> && (!std::is_same_v<std::decay_t<F>, move_only_function>)
+    move_only_function(F&& f) : impl_{std::make_unique<impl<std::decay_t<F>>>(std::forward<F>(f))} {}
+
+    explicit operator bool() const noexcept { return static_cast<bool>(impl_); }
+
+    R operator()(Args... args) const {
+        if (!impl_) {
+            throw std::bad_function_call{};
+        }
+        return impl_->call(std::forward<Args>(args)...);
+    }
+};
+
+}  // namespace rrmode::netlib::detail
+
+namespace std {
+using rrmode::netlib::detail::move_only_function;
+}  // namespace std
+
+#endif
diff --git a/include/netlib/execution/detail/task_promise.hpp b/include/netlib/execution/detail/task_promise.hpp
index ab7e204..df62895 100644
--- a/include/netlib/execution/detail/task_promise.hpp
+++ b/include/netlib/execution/detail/task_promise.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <netlib/execution/error.hpp>
 #include <netlib/execution/scheduler.hpp>
 
 #include <condition_variable>
@@ -51,7 +52,13 @@ inline void resume_on_scheduler(scheduler_holder& holder, std::coroutine_handle<
     }
     if (cont) {
         if (holder.sched != nullptr) {
-            holder.sched->schedule([cont]() mutable { cont.resume(); });
+            try {
+                holder.sched->schedule([cont]() mutable { cont.resume(); });
+            } catch (execution_error const&) {
+                // thread_pool остановлен: продолжение нельзя отложить, но цепочку co_await
+                // нужно завершить синхронно, иначе родитель зависнет на final_suspend.
+                cont.resume();
+            }
         } else {
             cont.resume();
         }
diff --git a/include/netlib/execution/scheduler.hpp b/include/netlib/execution/scheduler.hpp
index 1b377dc..8f748c4 100644
--- a/include/netlib/execution/scheduler.hpp
+++ b/include/netlib/execution/scheduler.hpp
@@ -1,8 +1,8 @@
 #pragma once
 
 #include <netlib/execution/executor.hpp>
+#include <netlib/detail/move_only_function.hpp>
 
-#include <functional>
 #include <memory>
 
 namespace rrmode::netlib::execution {
diff --git a/include/netlib/execution/task.hpp b/include/netlib/execution/task.hpp
index c1dca4b..87108f5 100644
--- a/include/netlib/execution/task.hpp
+++ b/include/netlib/execution/task.hpp
@@ -146,6 +146,8 @@ class [[nodiscard]] task {
 template<>
 class [[nodiscard]] task<void> {
 public:
+    using value_type = void;
+
     struct promise_type : detail::task_promise_storage<void> {
         using storage = detail::task_promise_storage<void>;
 
diff --git a/include/netlib/execution/thread_pool.hpp b/include/netlib/execution/thread_pool.hpp
index 46e4c29..f953dc8 100644
--- a/include/netlib/execution/thread_pool.hpp
+++ b/include/netlib/execution/thread_pool.hpp
@@ -40,6 +40,11 @@ class thread_pool : public executor {
         queue_.push(std::move(fn));
     }
 
+    /// После shutdown: true, если post() отклонит задачу.
+    [[nodiscard]] bool is_stopped() const noexcept {
+        return stopped_.load(std::memory_order_acquire);
+    }
+
     void request_stop() override { shutdown(); }
 
     /// Остановить пул: закрыть очередь, дождаться потоков.
diff --git a/include/netlib/net/detail/reactor_backend.hpp b/include/netlib/net/detail/reactor_backend.hpp
index 241333b..8be6741 100644
--- a/include/netlib/net/detail/reactor_backend.hpp
+++ b/include/netlib/net/detail/reactor_backend.hpp
@@ -1,9 +1,9 @@
 #pragma once
 
 #include <netlib/net/detail/poll_event.hpp>
+#include <netlib/detail/move_only_function.hpp>
 
 #include <chrono>
-#include <functional>
 
 namespace rrmode::netlib::net::detail {
 
diff --git a/include/netlib/net/detail/win_socket_backend.hpp b/include/netlib/net/detail/win_socket_backend.hpp
index c009c5b..57d2dce 100644
--- a/include/netlib/net/detail/win_socket_backend.hpp
+++ b/include/netlib/net/detail/win_socket_backend.hpp
@@ -232,9 +232,9 @@ class win_socket_backend final : public socket_backend {
     }
 
 private:
-    static SOCKET to_socket(int fd) { return reinterpret_cast<SOCKET>(static_cast<intptr_t>(fd)); }
+    static SOCKET to_socket(int fd) { return static_cast<SOCKET>(static_cast<UINT_PTR>(fd)); }
 
-    static int to_fd(SOCKET s) { return static_cast<int>(reinterpret_cast<intptr_t>(s)); }
+    static int to_fd(SOCKET s) { return static_cast<int>(static_cast<UINT_PTR>(s)); }
 
     [[noreturn]] static void throw_wsa(char const* context) {
         throw net_error(std::string{context} + ": WSA error " + std::to_string(::WSAGetLastError()));
diff --git a/include/netlib/net/medium/tcp_acceptor.hpp b/include/netlib/net/medium/tcp_acceptor.hpp
index 9261fea..39b7950 100644
--- a/include/netlib/net/medium/tcp_acceptor.hpp
+++ b/include/netlib/net/medium/tcp_acceptor.hpp
@@ -7,7 +7,7 @@
 #include <netlib/net/medium/tcp_socket.hpp>
 #include <netlib/net/tcp_acceptor.hpp>
 
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <utility>
 
 namespace rrmode::netlib::net::medium {
diff --git a/include/netlib/net/medium/tcp_socket.hpp b/include/netlib/net/medium/tcp_socket.hpp
index 13f9452..fde3bc6 100644
--- a/include/netlib/net/medium/tcp_socket.hpp
+++ b/include/netlib/net/medium/tcp_socket.hpp
@@ -6,7 +6,7 @@
 #include <netlib/net/medium/socket_options.hpp>
 #include <netlib/net/tcp_socket.hpp>
 
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <span>
 #include <vector>
 
diff --git a/include/netlib/net/simple/tcp_connection.hpp b/include/netlib/net/simple/tcp_connection.hpp
index f98941d..05f42c9 100644
--- a/include/netlib/net/simple/tcp_connection.hpp
+++ b/include/netlib/net/simple/tcp_connection.hpp
@@ -7,7 +7,7 @@
 #include <netlib/net/tcp_socket.hpp>
 
 #include <cstddef>
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <memory>
 #include <span>
 #include <thread>
diff --git a/include/netlib/net/simple/write_stream.hpp b/include/netlib/net/simple/write_stream.hpp
index 02bd1a4..8e9e66c 100644
--- a/include/netlib/net/simple/write_stream.hpp
+++ b/include/netlib/net/simple/write_stream.hpp
@@ -6,7 +6,7 @@
 #include <netlib/net/simple/writable_chunk.hpp>
 
 #include <cstddef>
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <optional>
 #include <vector>
 
diff --git a/include/netlib/net/tcp_acceptor.hpp b/include/netlib/net/tcp_acceptor.hpp
index b40ea47..a5209e7 100644
--- a/include/netlib/net/tcp_acceptor.hpp
+++ b/include/netlib/net/tcp_acceptor.hpp
@@ -9,7 +9,7 @@
 
 #include <atomic>
 #include <cstdint>
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <memory>
 #include <mutex>
 #include <utility>
diff --git a/include/netlib/net/tcp_socket.hpp b/include/netlib/net/tcp_socket.hpp
index 3aa4024..373849d 100644
--- a/include/netlib/net/tcp_socket.hpp
+++ b/include/netlib/net/tcp_socket.hpp
@@ -8,7 +8,7 @@
 #include <netlib/net/event_loop.hpp>
 
 #include <cstring>
-#include <functional>  // std::move_only_function
+#include <netlib/detail/move_only_function.hpp>
 #include <memory>
 #include <span>
 #include <utility>
diff --git a/include/netlib/net/udp_socket.hpp b/include/netlib/net/udp_socket.hpp
index 5f3a259..b915468 100644
--- a/include/netlib/net/udp_socket.hpp
+++ b/include/netlib/net/udp_socket.hpp
@@ -8,7 +8,7 @@
 #include <netlib/net/event_loop.hpp>
 
 #include <cstdint>
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <memory>
 #include <span>
 #include <utility>
diff --git a/include/netlib/net/unix_stream_acceptor.hpp b/include/netlib/net/unix_stream_acceptor.hpp
index 27f834b..c1a15d4 100644
--- a/include/netlib/net/unix_stream_acceptor.hpp
+++ b/include/netlib/net/unix_stream_acceptor.hpp
@@ -8,7 +8,7 @@
 #include <netlib/net/unix_stream_socket.hpp>
 
 #include <atomic>
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <memory>
 #include <mutex>
 #include <string>
diff --git a/include/netlib/net/unix_stream_socket.hpp b/include/netlib/net/unix_stream_socket.hpp
index 5714bb4..d24e659 100644
--- a/include/netlib/net/unix_stream_socket.hpp
+++ b/include/netlib/net/unix_stream_socket.hpp
@@ -8,7 +8,7 @@
 #include <netlib/net/unix_endpoint.hpp>
 
 #include <cstring>
-#include <functional>
+#include <netlib/detail/move_only_function.hpp>
 #include <memory>
 #include <span>
 #include <utility>
diff --git a/tests/fakes/fake_socket_backend.hpp b/tests/fakes/fake_socket_backend.hpp
index 9336f89..10bd557 100644
--- a/tests/fakes/fake_socket_backend.hpp
+++ b/tests/fakes/fake_socket_backend.hpp
@@ -4,6 +4,8 @@
 #include <netlib/net/error.hpp>
 #include <netlib/net/unix_endpoint.hpp>
 
+#include <algorithm>
+
 #include <deque>
 #include <optional>
 #include <span>
@@ -152,7 +154,7 @@ class fake_socket_backend final : public rrmode::netlib::net::detail::socket_bac
         auto dg = std::move(s.datagram_rx.front());
         s.datagram_rx.pop_front();
         out = dg.remote;
-        std::size_t const n = std::min(buf.size(), dg.payload.size());
+        std::size_t const n = (std::min)(buf.size(), dg.payload.size());
         for (std::size_t i = 0; i < n; ++i) {
             buf[i] = dg.payload[i];
         }
@@ -194,7 +196,7 @@ class fake_socket_backend final : public rrmode::netlib::net::detail::socket_bac
             }
             return std::size_t{0};
         }
-        std::size_t n = std::min(buf.size(), s.rx.size());
+        std::size_t n = (std::min)(buf.size(), s.rx.size());
         for (std::size_t i = 0; i < n; ++i) {
             buf[i] = s.rx.front();
             s.rx.pop_front();
diff --git a/tests/integration/udp_loopback_tests.cpp b/tests/integration/udp_loopback_tests.cpp
index 5e42b0c..0ab34f7 100644
--- a/tests/integration/udp_loopback_tests.cpp
+++ b/tests/integration/udp_loopback_tests.cpp
@@ -80,10 +80,10 @@ TEST_CASE("UDP loopback ping-pong") {
     REQUIRE(client_msg == "pong");
 }
 
+}  // namespace
+
 #else
 
 TEST_CASE("UDP loopback ping-pong") { REQUIRE(true); }
 
 #endif
-
-}  // namespace
diff --git a/tests/integration/unix_echo_coro_tests.cpp b/tests/integration/unix_echo_coro_tests.cpp
index dac5114..1d68a9d 100644
--- a/tests/integration/unix_echo_coro_tests.cpp
+++ b/tests/integration/unix_echo_coro_tests.cpp
@@ -8,10 +8,10 @@
 #include <catch2/catch_test_macros.hpp>
 #include <string>
 #include <thread>
-#include <unistd.h>
 #include <vector>
 
 #if defined(__linux__) || defined(__APPLE__)
+#include <unistd.h>
 
 using namespace std::chrono_literals;
 
diff --git a/tests/integration/unix_server_coro_shutdown_tests.cpp b/tests/integration/unix_server_coro_shutdown_tests.cpp
index 0c83b25..320995e 100644
--- a/tests/integration/unix_server_coro_shutdown_tests.cpp
+++ b/tests/integration/unix_server_coro_shutdown_tests.cpp
@@ -7,10 +7,10 @@
 #include <catch2/catch_test_macros.hpp>
 #include <string>
 #include <thread>
-#include <unistd.h>
 #include <vector>
 
 #if defined(__linux__) || defined(__APPLE__)
+#include <unistd.h>
 
 using namespace std::chrono_literals;
 
diff --git a/tests/unit/execution/delay_tests.cpp b/tests/unit/execution/delay_tests.cpp
index 14d7dcf..15f53c1 100644
--- a/tests/unit/execution/delay_tests.cpp
+++ b/tests/unit/execution/delay_tests.cpp
@@ -32,9 +32,9 @@ TEST_CASE("delay_async scheduler: параллельные паузы") {
     sync_wait(sched, parallel_delays(sched));
     auto const elapsed = std::chrono::steady_clock::now() - t0;
 
-    pool.shutdown();
     REQUIRE(elapsed >= std::chrono::milliseconds{35});
-    REQUIRE(elapsed < std::chrono::milliseconds{120});
+    REQUIRE(elapsed < std::chrono::milliseconds{300});
+    pool.shutdown();
 }
 
 TEST_CASE("delay_async scheduler: нулевая длительность") {
diff --git a/tests/unit/execution/task_tests.cpp b/tests/unit/execution/task_tests.cpp
index b6d523c..10fb6b2 100644
--- a/tests/unit/execution/task_tests.cpp
+++ b/tests/unit/execution/task_tests.cpp
@@ -1,9 +1,14 @@
 #include <netlib/execution/coroutine.hpp>
+#include <netlib/execution/error.hpp>
+#include <netlib/execution/executor.hpp>
 #include <netlib/execution/thread_pool.hpp>
 
 #include <catch2/catch_test_macros.hpp>
+#include <functional>
 #include <stdexcept>
 
+using rrmode::netlib::execution::execution_error;
+using rrmode::netlib::execution::executor;
 using rrmode::netlib::execution::scheduler;
 using rrmode::netlib::execution::sync_wait;
 using rrmode::netlib::execution::task;
@@ -51,6 +56,36 @@ TEST_CASE("task void завершается без значения") {
     pool.shutdown();
 }
 
+TEST_CASE("task: execution_error от schedule возобновляет continuation") {
+    struct stopped_executor final : executor {
+        void post(std::function<void()> /*fn*/) override {
+            throw execution_error("post в остановленный thread_pool");
+        }
+    };
+
+    stopped_executor ex;
+    scheduler sched{ex};
+    bool parent_done = false;
+    bool outer_done = false;
+
+    auto child = []() -> task<void> { co_return; };
+    auto parent = [&]() -> task<void> {
+        co_await child();
+        parent_done = true;
+    };
+    auto outer = [&]() -> task<void> {
+        co_await parent();
+        outer_done = true;
+    };
+
+    auto h = outer().release();
+    h.promise().set_scheduler(sched);
+    h.resume();
+
+    REQUIRE(parent_done);
+    REQUIRE(outer_done);
+}
+
 TEST_CASE("task пробрасывает исключение") {
     thread_pool pool{1};
     scheduler sched{pool};
diff --git a/tests/unit/execution/when_all_tests.cpp b/tests/unit/execution/when_all_tests.cpp
index 1103bc9..64dd7a0 100644
--- a/tests/unit/execution/when_all_tests.cpp
+++ b/tests/unit/execution/when_all_tests.cpp
@@ -36,8 +36,8 @@ TEST_CASE("when_all выполняет обе task параллельно") {
     REQUIRE(sync_wait(sched, when_all_demo(sched)) == 30);
     auto const elapsed = std::chrono::steady_clock::now() - t0;
 
+    REQUIRE(elapsed < std::chrono::milliseconds{200});
     pool.shutdown();
-    REQUIRE(elapsed < std::chrono::milliseconds{80});
 }
 
 TEST_CASE("when_all пробрасывает исключение") {
diff --git a/tests/unit/execution/when_all_tuple_tests.cpp b/tests/unit/execution/when_all_tuple_tests.cpp
index 38d0d47..d7bd61a 100644
--- a/tests/unit/execution/when_all_tuple_tests.cpp
+++ b/tests/unit/execution/when_all_tuple_tests.cpp
@@ -37,8 +37,8 @@ TEST_CASE("when_all tuple: 3 task параллельно") {
     REQUIRE(sync_wait(sched, sum_three(sched)) == 6);
     auto const elapsed = std::chrono::steady_clock::now() - t0;
 
+    REQUIRE(elapsed < std::chrono::milliseconds{200});
     pool.shutdown();
-    REQUIRE(elapsed < std::chrono::milliseconds{80});
 }
 
 TEST_CASE("when_all tuple: разные типы") {
diff --git a/tests/unit/execution/when_all_vector_tests.cpp b/tests/unit/execution/when_all_vector_tests.cpp
index 609e21d..5064876 100644
--- a/tests/unit/execution/when_all_vector_tests.cpp
+++ b/tests/unit/execution/when_all_vector_tests.cpp
@@ -44,8 +44,8 @@ TEST_CASE("when_all vector возвращает результаты по пор
     REQUIRE(sync_wait(sched, sum_three(sched)) == 6);
     auto const elapsed = std::chrono::steady_clock::now() - t0;
 
+    REQUIRE(elapsed < std::chrono::milliseconds{200});
     pool.shutdown();
-    REQUIRE(elapsed < std::chrono::milliseconds{80});
 }
 
 TEST_CASE("when_all vector пустой") {
diff --git a/tests/unit/execution/when_any_tests.cpp b/tests/unit/execution/when_any_tests.cpp
index a4d1c15..8394d75 100644
--- a/tests/unit/execution/when_any_tests.cpp
+++ b/tests/unit/execution/when_any_tests.cpp
@@ -47,6 +47,6 @@ TEST_CASE("with_timeout: бросает timeout_error") {
     thread_pool pool{2};
     scheduler sched{pool};
     REQUIRE_THROWS_AS(sync_wait(sched, timeout_race(sched)), timeout_error);
-    std::this_thread::sleep_for(std::chrono::milliseconds{250});
+    std::this_thread::sleep_for(std::chrono::milliseconds{300});
     pool.shutdown();
 }