diff --git a/include/circ_elem_array.h b/include/circ_elem_array.h
index 28e16ca..80c79b8 100644
--- a/include/circ_elem_array.h
+++ b/include/circ_elem_array.h
@@ -17,36 +17,31 @@ struct alignas(std::max_align_t) elem_array_head {
 
     std::atomic<u2_t> cc_ { 0 }; // connection counter, using for broadcast
     std::atomic<u2_t> wt_ { 0 }; // write index
-    std::atomic<u2_t> lc_ { 0 }; // write spin lock flag
 
     static u1_t index_of(u2_t c) { return static_cast<u1_t>(c); }
 
     std::size_t connect() {
-        return cc_.fetch_add(1, std::memory_order_release);
+        return cc_.fetch_add(1, std::memory_order_relaxed);
     }
 
     std::size_t disconnect() {
-        return cc_.fetch_sub(1, std::memory_order_release);
+        return cc_.fetch_sub(1, std::memory_order_relaxed);
     }
 
     std::size_t conn_count() const {
-        return cc_.load(std::memory_order_acquire);
+        return cc_.load(std::memory_order_relaxed);
     }
 
     u2_t cursor() const {
-        return wt_.load(std::memory_order_acquire);
+        return wt_.load(std::memory_order_relaxed);
     }
 
     auto acquire() {
-        while (lc_.exchange(1, std::memory_order_acquire)) {
-            std::this_thread::yield();
-        }
-        return index_of(wt_.load(std::memory_order_relaxed));
+        return index_of(wt_.load(std::memory_order_acquire));
     }
 
     void commit() {
-        wt_.fetch_add(1, std::memory_order_relaxed);
-        lc_.store(0, std::memory_order_release);
+        wt_.fetch_add(1, std::memory_order_release);
     }
 };
 
@@ -112,10 +107,11 @@ public:
             if (el->head_.rc_.compare_exchange_weak(
                         expected,
                         static_cast<uint_t<32>>(conn_count()),
-                        std::memory_order_release)) {
+                        std::memory_order_relaxed)) {
                 break;
             }
             std::this_thread::yield();
+            std::atomic_thread_fence(std::memory_order_acquire);
         }
         return el->data_;
     }
diff --git a/include/circ_queue.h b/include/circ_queue.h
index 6884c91..f5c191e 100644
--- a/include/circ_queue.h
+++ b/include/circ_queue.h
@@ -5,6 +5,7 @@
 #include <exception>
 #include <utility>
 #include <algorithm>
+#include <atomic>
 
 #include "def.h"
 #include "circ_elem_array.h"
@@ -20,7 +21,7 @@ public:
 private:
     array_t* elems_ = nullptr;
     typename array_t::u2_t cursor_ = 0;
-    bool connected_ = false;
+    std::atomic_bool connected_ { false };
 
 public:
     queue() = default;
@@ -29,36 +30,30 @@ public:
         attach(arr);
     }
 
-    queue(queue&& rhs) : queue() {
-        swap(rhs);
-    }
+    queue(const queue&) = delete;
+    queue& operator=(const queue&) = delete;
+    queue(queue&&) = delete;
+    queue& operator=(queue&&) = delete;
 
-    void swap(queue& rhs) {
-        std::swap(elems_    , rhs.elems_    );
-        std::swap(cursor_   , rhs.cursor_   );
-        std::swap(connected_, rhs.connected_);
-    }
-
-    queue& operator=(queue rhs) {
-        swap(rhs);
-        return *this;
-    }
-
-    array_t * elems() {
+    constexpr array_t * elems() const {
         return elems_;
     }
 
     std::size_t connect() {
         if (elems_ == nullptr) return error_count;
-        if (connected_) return error_count;
-        connected_ = true;
+        if (connected_.exchange(true, std::memory_order_relaxed)) {
+            // if it's already connected, just return an error count
+            return error_count;
+        }
         return elems_->connect();
     }
 
     std::size_t disconnect() {
         if (elems_ == nullptr) return error_count;
-        if (!connected_) return error_count;
-        connected_ = false;
+        if (!connected_.exchange(false, std::memory_order_relaxed)) {
+            // if it's already disconnected, just return an error count
+            return error_count;
+        }
         return elems_->disconnect();
     }
 
@@ -67,7 +62,7 @@ public:
     }
 
     bool connected() const {
-        return connected_;
+        return connected_.load(std::memory_order_relaxed);
     }
 
     array_t* attach(array_t* arr) {
@@ -95,7 +90,7 @@ public:
 
     template <typename P>
     auto push(P&& param) // disable this if P is the same as T
-     -> std::enable_if_t<!std::is_same<std::remove_reference_t<P>, T>::value, bool> {
+     -> Requires<!std::is_same<std::remove_reference_t<P>, T>::value, bool> {
         if (elems_ == nullptr) return false;
         auto ptr = elems_->acquire();
         ::new (ptr) T { std::forward<P>(param) };
@@ -105,7 +100,7 @@ public:
 
     template <typename... P>
     auto push(P&&... params) // some old compilers are not support this well
-     -> std::enable_if_t<(sizeof...(P) != 1), bool> {
+     -> Requires<(sizeof...(P) != 1), bool> {
         if (elems_ == nullptr) return false;
         auto ptr = elems_->acquire();
         ::new (ptr) T { std::forward<P>(params)... };
@@ -113,18 +108,40 @@ public:
         return true;
     }
 
-    T pop() {
-        if (elems_ == nullptr) throw std::invalid_argument {
-            "This queue hasn't attached any elem_array."
-        };
-        while (cursor_ == elems_->cursor()) {
+    template <typename QArr, typename At>
+    static T multi_pop(QArr& ques, std::size_t size, At&& at) {
+        if (size == 0) throw std::invalid_argument { "Invalid size." };
+        while (1) {
+            for (std::size_t i = 0; i < size; ++i) {
+                queue* cq = at(ques, i);
+                if (cq->elems_ == nullptr) throw std::logic_error {
+                    "This queue hasn't attached any elem_array."
+                };
+                if (cq->cursor_ != cq->elems_->cursor()) {
+                    auto item_ptr = static_cast<T*>(cq->elems_->take(cq->cursor_++));
+                    T item = std::move(*item_ptr);
+                    cq->elems_->put(item_ptr);
+                    return item;
+                }
+            }
             std::this_thread::yield();
         }
-        auto item_ptr = static_cast<T*>(elems_->take(cursor_++));
-        T item = *item_ptr;
-        elems_->put(item_ptr);
-        return item;
     }
+
+    static T multi_pop(queue* ques, std::size_t size) {
+        if (ques == nullptr) throw std::invalid_argument { "Invalid ques pointer." };
+        return multi_pop(ques, size, [](queue* ques, std::size_t i) {
+            return ques + i;
+        });
+    }
+
+    static T multi_pop(std::vector<queue*>& ques) {
+        return multi_pop(ques, ques.size(), [](auto& ques, std::size_t i) {
+            return ques[i];
+        });
+    }
+
+    T pop() { return multi_pop(this, 1); }
 };
 
 } // namespace circ
diff --git a/include/ipc.h b/include/ipc.h
index 6dbe7ec..a3e5480 100644
--- a/include/ipc.h
+++ b/include/ipc.h
@@ -9,8 +9,8 @@
 
 namespace ipc {
 
-using shm::handle_t;
-using buff_t = std::vector<byte_t>;
+using handle_t = void*;
+using buff_t   = std::vector<byte_t>;
 
 IPC_EXPORT buff_t make_buff(void const * data, std::size_t size);
 
@@ -25,21 +25,30 @@ IPC_EXPORT std::size_t recv_count(handle_t h);
 IPC_EXPORT bool   send(handle_t h, void const * data, std::size_t size);
 IPC_EXPORT buff_t recv(handle_t h);
 
-class IPC_EXPORT channel {
+/*
+ * This function could wait & recv messages from multi handles
+ * which have the *SAME* connected name.
+*/
+IPC_EXPORT buff_t recv(handle_t const * hs, std::size_t size);
+
+template <std::size_t N>
+buff_t recv(handle_t const (& hs)[N]) { return recv(hs, N); }
+
+class IPC_EXPORT route {
 public:
-    channel();
-    channel(char const * name);
-    channel(channel&& rhs);
+    route();
+    route(char const * name);
+    route(route&& rhs);
 
-    ~channel();
+    ~route();
 
-    void swap(channel& rhs);
-    channel& operator=(channel rhs);
+    void swap(route& rhs);
+    route& operator=(route rhs);
 
     bool         valid() const;
     char const * name () const;
 
-    channel clone() const;
+    route clone() const;
 
     bool connect(char const * name);
     void disconnect();
@@ -53,8 +62,8 @@ public:
     buff_t recv();
 
 private:
-    class channel_;
-    channel_* p_;
+    class route_;
+    route_* p_;
 };
 
 } // namespace ipc
diff --git a/include/shm.h b/include/shm.h
index 6e5762a..02f0c0c 100644
--- a/include/shm.h
+++ b/include/shm.h
@@ -7,12 +7,8 @@
 namespace ipc {
 namespace shm {
 
-using handle_t = void*;
-
-IPC_EXPORT handle_t acquire(char const * name, std::size_t size);
-IPC_EXPORT void     release(handle_t h, std::size_t size);
-IPC_EXPORT void*    open   (handle_t h);
-IPC_EXPORT void     close  (void* mem);
+IPC_EXPORT void* acquire(char const * name, std::size_t size);
+IPC_EXPORT void  release(void* mem, std::size_t size);
 
 class IPC_EXPORT handle {
 public:
@@ -32,8 +28,7 @@ public:
     bool acquire(char const * name, std::size_t size);
     void release();
 
-    void* get  ();
-    void  close();
+    void* get() const;
 
 private:
     class handle_;
diff --git a/src/ipc.cpp b/src/ipc.cpp
index 1dc2962..18dd5fe 100644
--- a/src/ipc.cpp
+++ b/src/ipc.cpp
@@ -1,18 +1,17 @@
 #include "ipc.h"
 
 #include <unordered_map>
-#include <memory>
 #include <type_traits>
 #include <cstring>
 #include <algorithm>
 #include <utility>
-#include <shared_mutex>
-#include <mutex>
+//#include <shared_mutex>
+//#include <mutex>
 #include <atomic>
 
 #include "def.h"
 #include "circ_queue.h"
-#include "rw_lock.h"
+//#include "rw_lock.h"
 //#include "tls_pointer.h"
 
 namespace {
@@ -29,42 +28,18 @@ struct msg_t {
 #pragma pack()
 
 using queue_t = circ::queue<msg_t>;
-using guard_t = std::unique_ptr<std::remove_pointer_t<handle_t>, void(*)(handle_t)>;
 
 struct shm_info_t {
     std::atomic_size_t id_acc_; // message id accumulator
     queue_t::array_t   elems_;  // the circ_elem_array in shm
 };
 
-///*
-// * thread_local stl object's destructor causing crash
-// * See: https://sourceforge.net/p/mingw-w64/bugs/527/
-// *      https://sourceforge.net/p/mingw-w64/bugs/727/
-//*/
-///*thread_local*/
-//tls::pointer<std::unordered_map<decltype(msg_t::id_), buff_t>> recv_caches__;
-
-std::unordered_map<handle_t, queue_t> h2q__;
-rw_lock h2q_lc__;
-
-inline queue_t* queue_of(handle_t h) {
-    if (h == nullptr) {
-        return nullptr;
-    }
-    std::shared_lock<rw_lock> guard { h2q_lc__ };
-    auto it = h2q__.find(h);
-    if (it == h2q__.end()) {
-        return nullptr;
-    }
-    if (it->second.elems() == nullptr) {
-        return nullptr;
-    }
-    return &(it->second);
+constexpr queue_t* queue_of(handle_t h) {
+    return static_cast<queue_t*>(h);
 }
 
-inline std::atomic_size_t* acc_of(queue_t* queue) {
-    auto elems = queue->elems();
-    return reinterpret_cast<std::atomic_size_t*>(elems) - 1;
+constexpr std::atomic_size_t* acc_of(queue_t* queue) {
+    return reinterpret_cast<std::atomic_size_t*>(queue->elems()) - 1;
 }
 
 } // internal-linkage
@@ -79,40 +54,21 @@ buff_t make_buff(void const * data, std::size_t size) {
 }
 
 handle_t connect(char const * name) {
-    auto h = shm::acquire(name, sizeof(shm_info_t));
-    if (h == nullptr) {
-        return nullptr;
-    }
-    guard_t h_guard {
-        h, [](handle_t h) { shm::release(h, sizeof(shm_info_t)); }
-    };
-    auto mem = shm::open(h);
+    auto mem = shm::acquire(name, sizeof(shm_info_t));
     if (mem == nullptr) {
         return nullptr;
     }
-    {
-        std::unique_lock<rw_lock> guard { h2q_lc__ };
-        h2q__[h].attach(&(static_cast<shm_info_t*>(mem)->elems_));
-    }
-    h_guard.release();
-    return h;
+    return new queue_t { &(static_cast<shm_info_t*>(mem)->elems_) };
 }
 
 void disconnect(handle_t h) {
-    if (h == nullptr) {
+    queue_t* que = queue_of(h);
+    if (que == nullptr) {
         return;
     }
-    void* mem = nullptr;
-    {
-        std::unique_lock<rw_lock> guard { h2q_lc__ };
-        auto it = h2q__.find(h);
-        if (it == h2q__.end()) return;
-        it->second.disconnect();
-        mem = it->second.elems(); // needn't to detach
-        h2q__.erase(it);
-    }
-    shm::close(mem);
-    shm::release(h, sizeof(queue_t));
+    que->disconnect(); // needn't to detach, cause it will be deleted soon.
+    shm::release(acc_of(que), sizeof(shm_info_t));
+    delete que;
 }
 
 std::size_t recv_count(handle_t h) {
@@ -161,17 +117,29 @@ bool send(handle_t h, void const * data, std::size_t size) {
 }
 
 buff_t recv(handle_t h) {
-    auto queue = queue_of(h);
-    if (queue == nullptr) {
+    return recv(&h, 1);
+}
+
+buff_t recv(handle_t const * hs, std::size_t size) {
+    thread_local std::vector<queue_t*> q_arr(size);
+    q_arr.clear(); // make the size to 0
+    for (size_t i = 0; i < size; ++i) {
+        auto queue = queue_of(hs[i]);
+        if (queue == nullptr) continue;
+        queue->connect(); // wouldn't connect twice
+        q_arr.push_back(queue);
+    }
+    if (q_arr.empty()) {
         return {};
     }
-    if (!queue->connected()) {
-        queue->connect();
-    }
+    /*
+     * the performance of tls::pointer is not good enough
+     * so regardless of the mingw-crash-problem for the moment
+    */
     thread_local std::unordered_map<decltype(msg_t::id_), buff_t> rcs;
     while(1) {
         // pop a new message
-        auto msg = queue->pop();
+        auto msg = queue_t::multi_pop(q_arr);
         // msg.remain_ may minus & abs(msg.remain_) < data_length
         std::size_t remain = static_cast<std::size_t>(
                              static_cast<int>(data_length) + msg.remain_);
@@ -201,79 +169,79 @@ buff_t recv(handle_t h) {
     }
 }
 
-class channel::channel_ : public pimpl<channel_> {
+class route::route_ : public pimpl<route_> {
 public:
     handle_t    h_ = nullptr;
     std::string n_;
 };
 
-channel::channel()
+route::route()
     : p_(p_->make()) {
 }
 
-channel::channel(char const * name)
-    : channel() {
+route::route(char const * name)
+    : route() {
     this->connect(name);
 }
 
-channel::channel(channel&& rhs)
-    : channel() {
+route::route(route&& rhs)
+    : route() {
     swap(rhs);
 }
 
-channel::~channel() {
+route::~route() {
     p_->clear();
 }
 
-void channel::swap(channel& rhs) {
+void route::swap(route& rhs) {
     std::swap(p_, rhs.p_);
 }
 
-channel& channel::operator=(channel rhs) {
+route& route::operator=(route rhs) {
     swap(rhs);
     return *this;
 }
 
-bool channel::valid() const {
+bool route::valid() const {
     return (impl(p_)->h_ != nullptr);
 }
 
-char const * channel::name() const {
+char const * route::name() const {
     return impl(p_)->n_.c_str();
 }
 
-channel channel::clone() const {
+route route::clone() const {
     return { name() };
 }
 
-bool channel::connect(char const * name) {
+bool route::connect(char const * name) {
     if (name == nullptr || name[0] == '\0') return false;
     this->disconnect();
     impl(p_)->h_ = ipc::connect((impl(p_)->n_ = name).c_str());
     return valid();
 }
 
-void channel::disconnect() {
+void route::disconnect() {
     ipc::disconnect(impl(p_)->h_);
 }
 
-std::size_t channel::recv_count() const {
+std::size_t route::recv_count() const {
     return ipc::recv_count(impl(p_)->h_);
 }
 
-bool channel::send(void const *data, std::size_t size) {
+bool route::send(void const *data, std::size_t size) {
     return ipc::send(impl(p_)->h_, data, size);
 }
 
-bool channel::send(buff_t const & buff) {
-    return channel::send(buff.data(), buff.size());
+bool route::send(buff_t const & buff) {
+    return route::send(buff.data(), buff.size());
 }
 
-bool channel::send(std::string const & str) {
-    return channel::send(str.c_str(), str.size() + 1);
+bool route::send(std::string const & str) {
+    return route::send(str.c_str(), str.size() + 1);
 }
 
-buff_t channel::recv() {
+buff_t route::recv() {
     return ipc::recv(impl(p_)->h_);
 }
 
diff --git a/src/platform/shm_linux.cpp b/src/platform/shm_linux.cpp
index d048fc4..e70d654 100644
--- a/src/platform/shm_linux.cpp
+++ b/src/platform/shm_linux.cpp
@@ -9,7 +9,7 @@
 namespace ipc {
 namespace shm {
 
-handle_t acquire(char const * name, std::size_t size) {
+void* acquire(char const * name, std::size_t size) {
     if (name == nullptr || name[0] == '\0' || size == 0) {
         return nullptr;
     }
@@ -32,18 +32,11 @@ handle_t acquire(char const * name, std::size_t size) {
     return mem;
 }
 
-void release(handle_t h, std::size_t size) {
-    if (h == nullptr) {
+void release(void* mem, std::size_t size) {
+    if (mem == nullptr) {
         return;
     }
-    ::munmap(h, size);
-}
-
-void* open(handle_t h) {
-    return h;
-}
-
-void close(void* /*mem*/) {
+    ::munmap(mem, size);
 }
 
 } // namespace shm
diff --git a/src/platform/shm_win.cpp b/src/platform/shm_win.cpp
index ce706db..e1f7a68 100644
--- a/src/platform/shm_win.cpp
+++ b/src/platform/shm_win.cpp
@@ -7,6 +7,7 @@
 #include <locale>
 #include <codecvt>
 #include <utility>
+#include <unordered_map>
 
 #include "def.h"
 
@@ -25,50 +26,44 @@ constexpr auto to_tchar(std::string && str) -> IsSame<T, std::wstring> {
     return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>{}.from_bytes(std::move(str));
 }
 
+std::unordered_map<void*, HANDLE> m2h__;
+
 } // internal-linkage
 
 namespace ipc {
 namespace shm {
 
-handle_t acquire(char const * name, std::size_t size) {
+void* acquire(char const * name, std::size_t size) {
     if (name == nullptr || name[0] == '\0' || size == 0) {
         return nullptr;
     }
-    HANDLE h = ::CreateFileMapping(
-        INVALID_HANDLE_VALUE, NULL,
-        PAGE_READWRITE | SEC_COMMIT,
-        0, static_cast<DWORD>(size),
-        to_tchar(std::string{"__SHM__"} + name).c_str()
-    );
+    HANDLE h = ::CreateFileMapping(INVALID_HANDLE_VALUE, NULL,
+                                   PAGE_READWRITE | SEC_COMMIT,
+                                   0, static_cast<DWORD>(size),
+                                   to_tchar(std::string{"__SHM__"} + name).c_str());
     if (h == NULL) {
         return nullptr;
     }
-    return h;
-}
-
-void release(handle_t h, std::size_t /*size*/) {
-    if (h == nullptr) {
-        return;
-    }
-    ::CloseHandle(h);
-}
-
-void* open(handle_t h) {
-    if (h == nullptr) {
-        return nullptr;
-    }
     LPVOID mem = ::MapViewOfFile(h, FILE_MAP_ALL_ACCESS, 0, 0, 0);
     if (mem == NULL) {
+        ::CloseHandle(h);
         return nullptr;
     }
+    m2h__.emplace(mem, h);
     return mem;
 }
 
-void close(void* mem) {
+void release(void* mem, std::size_t /*size*/) {
     if (mem == nullptr) {
         return;
     }
+    auto it = m2h__.find(mem);
+    if (it == m2h__.end()) {
+        return;
+    }
     ::UnmapViewOfFile(mem);
+    ::CloseHandle(it->second);
+    m2h__.erase(it);
 }
 
 } // namespace shm
diff --git a/src/shm.cpp b/src/shm.cpp
index 2f1b3e2..a59a57c 100644
--- a/src/shm.cpp
+++ b/src/shm.cpp
@@ -10,9 +10,8 @@ namespace shm {
 
 class handle::handle_ : public pimpl<handle_> {
 public:
-    handle*  t_ = nullptr;
-    handle_t h_ = nullptr;
-    void*    m_ = nullptr;
+    handle* t_ = nullptr;
+    void*   m_ = nullptr;
 
     std::string n_ {};
     std::size_t s_ = 0;
@@ -20,10 +19,7 @@ public:
     handle_() = default;
     handle_(handle* t) : t_{t} {}
 
-    ~handle_() {
-        t_->close();
-        t_->release();
-    }
+    ~handle_() { t_->release(); }
 };
 
 handle::handle()
@@ -54,7 +50,7 @@ handle& handle::operator=(handle rhs) {
 }
 
 bool handle::valid() const {
-    return impl(p_)->h_ != nullptr;
+    return impl(p_)->m_ != nullptr;
 }
 
 std::size_t handle::size() const {
@@ -66,33 +62,23 @@ char const * handle::name() const {
 }
 
 bool handle::acquire(char const * name, std::size_t size) {
-    close();
     release();
-    impl(p_)->h_ = shm::acquire((impl(p_)->n_ = name).c_str(),
+    impl(p_)->m_ = shm::acquire((impl(p_)->n_ = name).c_str(),
                                  impl(p_)->s_ = size);
     return valid();
 }
 
 void handle::release() {
     if (!valid()) return;
-    shm::release(impl(p_)->h_, impl(p_)->s_);
-    impl(p_)->h_ = nullptr;
+    shm::release(impl(p_)->m_, impl(p_)->s_);
+    impl(p_)->m_ = nullptr;
     impl(p_)->s_ = 0;
     impl(p_)->n_.clear();
 }
 
-void* handle::get() {
+void* handle::get() const {
     if (!valid()) return nullptr;
-    if (impl(p_)->m_ == nullptr) {
-        return impl(p_)->m_ = shm::open(impl(p_)->h_);
-    }
-    else return impl(p_)->m_;
-}
-
-void handle::close() {
-    if (!valid()) return;
-    shm::close(impl(p_)->m_);
-    impl(p_)->m_ = nullptr;
+    return impl(p_)->m_;
 }
 
 } // namespace shm
diff --git a/test/test_circ.cpp b/test/test_circ.cpp
index 3a0a7de..1d87e8d 100644
--- a/test/test_circ.cpp
+++ b/test/test_circ.cpp
@@ -123,18 +123,16 @@ struct test_cq<ipc::circ::queue<T>> {
         ::new (ca_) ca_t;
     }
 
-    cn_t connect() {
-        cn_t queue;
-        [&] {
-            queue.attach(ca_);
-            QVERIFY(queue.connect() != ipc::error_count);
-        } ();
+    cn_t* connect() {
+        cn_t* queue = new cn_t { ca_ };
+        [&] { QVERIFY(queue->connect() != ipc::error_count); } ();
         return queue;
     }
 
-    void disconnect(cn_t& queue) {
-        QVERIFY(queue.disconnect() != ipc::error_count);
-        QVERIFY(queue.detach() != nullptr);
+    void disconnect(cn_t* queue) {
+        QVERIFY(queue->disconnect() != ipc::error_count);
+        QVERIFY(queue->detach() != nullptr);
+        delete queue;
     }
 
     void wait_start(int M) {
@@ -144,9 +142,9 @@ struct test_cq<ipc::circ::queue<T>> {
     }
 
     template <typename F>
-    void recv(cn_t& queue, F&& proc) {
+    void recv(cn_t* queue, F&& proc) {
         do {
-            auto msg = queue.pop();
+            auto msg = queue->pop();
             if (msg.pid_ < 0) return;
             proc(msg);
         } while(1);
@@ -173,9 +171,7 @@ private slots:
     void test_inst();
     void test_prod_cons_1v1();
     void test_prod_cons_1v3();
-    void test_prod_cons_3v1();
     void test_prod_cons_performance();
-
     void test_queue();
 } unit__;
 
@@ -223,10 +219,6 @@ void Unit::test_prod_cons_1v3() {
     test_prod_cons<1, 3>();
 }
 
-void Unit::test_prod_cons_3v1() {
-    test_prod_cons<3, 1>();
-}
-
 template <int P, int C>
 struct test_performance {
     static void start() {
@@ -259,10 +251,8 @@ struct test_performance<1, 1> {
 };
 
 void Unit::test_prod_cons_performance() {
-    test_performance<1 , 10>::start();
-    test_performance<10, 1 >::start();
-    test_performance<10, 10>::start();
-    test_prod_cons  <3 , 3 >(); // test & verify
+    test_performance<1, 10>::start();
+    test_prod_cons  <1, 10>(); // test & verify
 }
 
 #ifndef QVERIFY_EXCEPTION_THROWN
@@ -299,9 +289,10 @@ void Unit::test_queue() {
     queue.attach(cq);
     QVERIFY(queue.detach() != nullptr);
 
-    benchmark_prod_cons<1, 3, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
-    benchmark_prod_cons<3, 1, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
-    benchmark_prod_cons<3, 3, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
+    benchmark_prod_cons<1, 1, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
+    benchmark_prod_cons<1, 2, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
+    benchmark_prod_cons<1, 4, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
+    benchmark_prod_cons<1, 8, LoopCount>((ipc::circ::queue<msg_t>*)nullptr);
 }
 
 } // internal-linkage
diff --git a/test/test_ipc.cpp b/test/test_ipc.cpp
index a7c299f..d3b2621 100644
--- a/test/test_ipc.cpp
+++ b/test/test_ipc.cpp
@@ -38,13 +38,13 @@ constexpr int LoopCount = 100000;
 } // internal-linkage
 
 template <>
-struct test_cq<ipc::channel> {
-    using cn_t = ipc::channel;
+struct test_cq<ipc::route> {
+    using cn_t = ipc::route;
 
     std::string conn_name_;
 
     test_cq(void*)
-        : conn_name_("test-ipc-channel") {
+        : conn_name_("test-ipc-route") {
         auto watcher = connect();
         QCOMPARE(watcher.recv_count(), static_cast<std::size_t>(0));
     }
@@ -84,7 +84,7 @@ struct test_cq<ipc::channel> {
 };
 
 template <>
-struct test_verify<ipc::channel> {
+struct test_verify<ipc::route> {
     std::unordered_map<int, std::vector<ipc::buff_t>> list_;
     int lcount_;
 
@@ -121,8 +121,8 @@ private slots:
 
     void test_rw_lock();
     void test_send_recv();
-    void test_channel();
-    void test_channel_performance();
+    void test_route();
+    void test_route_performance();
 } unit__;
 
 #include "test_ipc.moc"
@@ -264,9 +264,9 @@ void Unit::test_send_recv() {
     ipc::disconnect(h);
 }
 
-void Unit::test_channel() {
+void Unit::test_route() {
     auto wait_for_handshake = [](int id) {
-        ipc::channel cc { "my-ipc-channel" };
+        ipc::route cc { "my-ipc-route" };
         std::string cfm = "copy:" + std::to_string(id), ack = "re-" + cfm;
         std::atomic_bool unmatched { true };
         std::thread re {[&] {
@@ -347,7 +347,7 @@ void Unit::test_channel() {
 
 template <int N, int M, bool V = true, int Loops = LoopCount>
 void test_prod_cons() {
-    benchmark_prod_cons<N, M, Loops, std::conditional_t<V, ipc::channel, void>>((ipc::channel*)nullptr);
+    benchmark_prod_cons<N, M, Loops, std::conditional_t<V, ipc::route, void>>((ipc::route*)nullptr);
 }
 
 template <int P, int C>
@@ -381,12 +381,9 @@ struct test_performance<1, 1> {
     }
 };
 
-void Unit::test_channel_performance() {
+void Unit::test_route_performance() {
     test_prod_cons<1, 1>();
-
-//    test_performance<1, 8>::start();
-//    test_performance<8, 1>::start();
-//    test_performance<8, 8>::start();
+    test_performance<1, 10>::start();
 }
 
 } // internal-linkage
diff --git a/test/test_shm.cpp b/test/test_shm.cpp
index 8d096e0..42046f5 100644
--- a/test/test_shm.cpp
+++ b/test/test_shm.cpp
@@ -62,8 +62,8 @@ void Unit::test_get() {
     memset(buf, 0, sizeof(buf));
     QVERIFY(memcmp(mem, buf, sizeof(buf)) == 0);
 
-    shm_hd__.close();
-    QVERIFY(mem == shm_hd__.get());
+    handle shm_other(shm_hd__.name(), shm_hd__.size());
+    QVERIFY(shm_other.get() != shm_hd__.get());
 }
 
 void Unit::test_hello() {
@@ -72,7 +72,6 @@ void Unit::test_hello() {
 
     constexpr char hello[] = "hello!";
     std::memcpy(mem, hello, sizeof(hello));
-    shm_hd__.close();
     QCOMPARE((char*)shm_hd__.get(), hello);
 }
 
@@ -81,7 +80,6 @@ void Unit::test_mt() {
         [] {
             handle shm_mt(shm_hd__.name(), shm_hd__.size());
 
-            shm_hd__.close();
             shm_hd__.release();
 
             constexpr char hello[] = "hello!";