From cca70b018cb0548e3c5d51db020da8b043a25254 Mon Sep 17 00:00:00 2001
From: mutouyun <mark.lonr@tom.com>
Date: Mon, 17 Dec 2018 19:07:18 +0800
Subject: [PATCH] improve test cases (has bugs)

---
 include/circ_elem_array.h |  18 ++---
 include/circ_queue.h      |  16 ++--
 include/ipc.h             |  15 ++--
 include/shm.h             |  16 ++--
 src/ipc.cpp               |  36 +++++++--
 src/shm.cpp               |  18 ++---
 test/random.hpp           |  52 +++++++++++++
 test/test.h               |  63 +++++++++++++++
 test/test_circ.cpp        | 157 +++++++++++++-------------------------
 test/test_ipc.cpp         | 109 ++++++++++++++++++++++++++
 10 files changed, 346 insertions(+), 154 deletions(-)
 create mode 100644 test/random.hpp

diff --git a/include/circ_elem_array.h b/include/circ_elem_array.h
index 9606172..28e16ca 100644
--- a/include/circ_elem_array.h
+++ b/include/circ_elem_array.h
@@ -21,30 +21,30 @@ struct alignas(std::max_align_t) elem_array_head {
 
     static u1_t index_of(u2_t c) { return static_cast<u1_t>(c); }
 
-    std::size_t connect(void) {
+    std::size_t connect() {
         return cc_.fetch_add(1, std::memory_order_release);
     }
 
-    std::size_t disconnect(void) {
+    std::size_t disconnect() {
         return cc_.fetch_sub(1, std::memory_order_release);
     }
 
-    std::size_t conn_count(void) const {
+    std::size_t conn_count() const {
         return cc_.load(std::memory_order_acquire);
     }
 
-    u2_t cursor(void) const {
+    u2_t cursor() const {
         return wt_.load(std::memory_order_acquire);
     }
 
-    auto acquire(void) {
+    auto acquire() {
         while (lc_.exchange(1, std::memory_order_acquire)) {
             std::this_thread::yield();
         }
         return index_of(wt_.load(std::memory_order_relaxed));
     }
 
-    void commit(void) {
+    void commit() {
         wt_.fetch_add(1, std::memory_order_relaxed);
         lc_.store(0, std::memory_order_release);
     }
@@ -84,7 +84,7 @@ private:
     };
     elem_t block_[elem_max];
 
-    elem_t* elem_start(void) {
+    elem_t* elem_start() {
         return block_;
     }
 
@@ -92,7 +92,7 @@ private:
            elem_t* elem(u1_t i   ) { return elem_start() + i; }
 
 public:
-    elem_array(void) = default;
+    elem_array() = default;
 
     elem_array(const elem_array&) = delete;
     elem_array& operator=(const elem_array&) = delete;
@@ -104,7 +104,7 @@ public:
     using base_t::conn_count;
     using base_t::cursor;
 
-    void* acquire(void) {
+    void* acquire() {
         elem_t* el = elem(base_t::acquire());
         // check all consumers have finished reading
         while(1) {
diff --git a/include/circ_queue.h b/include/circ_queue.h
index c64b9a7..6884c91 100644
--- a/include/circ_queue.h
+++ b/include/circ_queue.h
@@ -23,7 +23,7 @@ private:
     bool connected_ = false;
 
 public:
-    queue(void) = default;
+    queue() = default;
 
     explicit queue(array_t* arr) : queue() {
         attach(arr);
@@ -44,29 +44,29 @@ public:
         return *this;
     }
 
-    array_t * elems(void) {
+    array_t * elems() {
         return elems_;
     }
 
-    std::size_t connect(void) {
+    std::size_t connect() {
         if (elems_ == nullptr) return error_count;
         if (connected_) return error_count;
         connected_ = true;
         return elems_->connect();
     }
 
-    std::size_t disconnect(void) {
+    std::size_t disconnect() {
         if (elems_ == nullptr) return error_count;
         if (!connected_) return error_count;
         connected_ = false;
         return elems_->disconnect();
     }
 
-    std::size_t conn_count(void) const {
+    std::size_t conn_count() const {
         return (elems_ == nullptr) ? error_count : elems_->conn_count();
     }
 
-    bool connected(void) const {
+    bool connected() const {
         return connected_;
     }
 
@@ -78,7 +78,7 @@ public:
         return old;
     }
 
-    array_t* detach(void) {
+    array_t* detach() {
         if (elems_ == nullptr) return nullptr;
         auto old = elems_;
         elems_ = nullptr;
@@ -113,7 +113,7 @@ public:
         return true;
     }
 
-    T pop(void) {
+    T pop() {
         if (elems_ == nullptr) throw std::invalid_argument {
             "This queue hasn't attached any elem_array."
         };
diff --git a/include/ipc.h b/include/ipc.h
index 99a8a65..9829e19 100644
--- a/include/ipc.h
+++ b/include/ipc.h
@@ -20,27 +20,30 @@ buff_t make_buff(byte_t const (& data)[N]) { return make_buff(data, N); }
 IPC_EXPORT handle_t connect   (char const * name);
 IPC_EXPORT void     disconnect(handle_t h);
 
+IPC_EXPORT std::size_t conn_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 {
 public:
-    channel(void);
+    channel();
     channel(char const * name);
     channel(channel&& rhs);
 
-    ~channel(void);
+    ~channel();
 
     void swap(channel& rhs);
     channel& operator=(channel rhs);
 
-    bool         valid(void) const;
-    char const * name (void) const;
+    bool         valid() const;
+    char const * name () const;
 
-    channel clone(void) const;
+    channel clone() const;
 
     bool connect(char const * name);
-    void disconnect(void);
+    void disconnect();
+    std::size_t conn_count() const;
 
     bool send(void const * data, std::size_t size);
     bool send(buff_t const & buff);
diff --git a/include/shm.h b/include/shm.h
index 97e31fc..6e5762a 100644
--- a/include/shm.h
+++ b/include/shm.h
@@ -16,24 +16,24 @@ IPC_EXPORT void     close  (void* mem);
 
 class IPC_EXPORT handle {
 public:
-    handle(void);
+    handle();
     handle(char const * name, std::size_t size);
     handle(handle&& rhs);
 
-    ~handle(void);
+    ~handle();
 
     void swap(handle& rhs);
     handle& operator=(handle rhs);
 
-    bool         valid(void) const;
-    std::size_t  size (void) const;
-    char const * name (void) const;
+    bool         valid() const;
+    std::size_t  size () const;
+    char const * name () const;
 
     bool acquire(char const * name, std::size_t size);
-    void release(void);
+    void release();
 
-    void* get  (void);
-    void  close(void);
+    void* get  ();
+    void  close();
 
 private:
     class handle_;
diff --git a/src/ipc.cpp b/src/ipc.cpp
index ce2f89f..932a879 100644
--- a/src/ipc.cpp
+++ b/src/ipc.cpp
@@ -90,15 +90,24 @@ handle_t connect(char const * name) {
     if (mem == nullptr) {
         return nullptr;
     }
+    queue_t* queue;
     {
         std::unique_lock<rw_lock> guard { h2q_lc__ };
-        h2q__[h].attach(&(static_cast<shm_info_t*>(mem)->elems_));
+        queue = &(h2q__[h]);
+        if (queue == nullptr) {
+            return nullptr;
+        }
+        queue->attach(&(static_cast<shm_info_t*>(mem)->elems_));
+        queue->connect();
     }
     h_guard.release();
     return h;
 }
 
 void disconnect(handle_t h) {
+    if (h == nullptr) {
+        return;
+    }
     void* mem = nullptr;
     {
         std::unique_lock<rw_lock> guard { h2q_lc__ };
@@ -112,6 +121,14 @@ void disconnect(handle_t h) {
     shm::release(h, sizeof(queue_t));
 }
 
+std::size_t conn_count(handle_t h) {
+    auto queue = queue_of(h);
+    if (queue == nullptr) {
+        return error_count;
+    }
+    return queue->conn_count();
+}
+
 bool send(handle_t h, void const * data, std::size_t size) {
     if (data == nullptr) {
         return false;
@@ -196,7 +213,7 @@ public:
     std::string n_;
 };
 
-channel::channel(void)
+channel::channel()
     : p_(p_->make()) {
 }
 
@@ -210,7 +227,7 @@ channel::channel(channel&& rhs)
     swap(rhs);
 }
 
-channel::~channel(void) {
+channel::~channel() {
     p_->clear();
 }
 
@@ -223,15 +240,15 @@ channel& channel::operator=(channel rhs) {
     return *this;
 }
 
-bool channel::valid(void) const {
+bool channel::valid() const {
     return (impl(p_)->h_ != nullptr);
 }
 
-char const * channel::name(void) const {
+char const * channel::name() const {
     return impl(p_)->n_.c_str();
 }
 
-channel channel::clone(void) const {
+channel channel::clone() const {
     return { name() };
 }
 
@@ -242,11 +259,14 @@ bool channel::connect(char const * name) {
     return valid();
 }
 
-void channel::disconnect(void) {
-    if (!valid()) return;
+void channel::disconnect() {
     ipc::disconnect(impl(p_)->h_);
 }
 
+std::size_t channel::conn_count() const {
+    return ipc::conn_count(impl(p_)->h_);
+}
+
 bool channel::send(void const *data, std::size_t size) {
     return ipc::send(impl(p_)->h_, data, size);
 }
diff --git a/src/shm.cpp b/src/shm.cpp
index 695c17b..2f1b3e2 100644
--- a/src/shm.cpp
+++ b/src/shm.cpp
@@ -20,13 +20,13 @@ public:
     handle_() = default;
     handle_(handle* t) : t_{t} {}
 
-    ~handle_(void) {
+    ~handle_() {
         t_->close();
         t_->release();
     }
 };
 
-handle::handle(void)
+handle::handle()
     : p_(p_->make(this)) {
 }
 
@@ -40,7 +40,7 @@ handle::handle(handle&& rhs)
     swap(rhs);
 }
 
-handle::~handle(void) {
+handle::~handle() {
     p_->clear();
 }
 
@@ -53,15 +53,15 @@ handle& handle::operator=(handle rhs) {
     return *this;
 }
 
-bool handle::valid(void) const {
+bool handle::valid() const {
     return impl(p_)->h_ != nullptr;
 }
 
-std::size_t handle::size(void) const {
+std::size_t handle::size() const {
     return impl(p_)->s_;
 }
 
-char const * handle::name(void) const {
+char const * handle::name() const {
     return impl(p_)->n_.c_str();
 }
 
@@ -73,7 +73,7 @@ bool handle::acquire(char const * name, std::size_t size) {
     return valid();
 }
 
-void handle::release(void) {
+void handle::release() {
     if (!valid()) return;
     shm::release(impl(p_)->h_, impl(p_)->s_);
     impl(p_)->h_ = nullptr;
@@ -81,7 +81,7 @@ void handle::release(void) {
     impl(p_)->n_.clear();
 }
 
-void* handle::get(void) {
+void* handle::get() {
     if (!valid()) return nullptr;
     if (impl(p_)->m_ == nullptr) {
         return impl(p_)->m_ = shm::open(impl(p_)->h_);
@@ -89,7 +89,7 @@ void* handle::get(void) {
     else return impl(p_)->m_;
 }
 
-void handle::close(void) {
+void handle::close() {
     if (!valid()) return;
     shm::close(impl(p_)->m_);
     impl(p_)->m_ = nullptr;
diff --git a/test/random.hpp b/test/random.hpp
new file mode 100644
index 0000000..78f0e60
--- /dev/null
+++ b/test/random.hpp
@@ -0,0 +1,52 @@
+/*
+    The Capo Library
+    Code covered by the MIT License
+
+    Author: mutouyun (http://orzz.org)
+*/
+
+#pragma once
+
+#include <random>   // std::default_random_engine, std::uniform_int_distribution
+#include <utility>  // std::forward
+
+namespace capo {
+
+////////////////////////////////////////////////////////////////
+/// Simple way of generating random numbers
+////////////////////////////////////////////////////////////////
+
+template <class Engine       = std::default_random_engine, 
+          class Distribution = std::uniform_int_distribution<>>
+class random : public Distribution
+{
+    using base_t = Distribution;
+
+public:
+    using engine_type       = Engine;
+    using distribution_type = Distribution;
+    using result_type       = typename distribution_type::result_type;
+    using param_type        = typename distribution_type::param_type;
+
+private:
+    engine_type engine_;
+
+public:
+    template <typename... T>
+    random(T&&... args)
+        : base_t (std::forward<T>(args)...)
+        , engine_(std::random_device{}())
+    {}
+
+    result_type operator()(void)
+    {
+        return base_t::operator()(engine_);
+    }
+
+    result_type operator()(const param_type& parm)
+    {
+        return base_t::operator()(engine_, parm);
+    }
+};
+
+} // namespace capo
diff --git a/test/test.h b/test/test.h
index b7e929c..174b756 100644
--- a/test/test.h
+++ b/test/test.h
@@ -4,6 +4,7 @@
 
 #include <iostream>
 #include <atomic>
+#include <thread>
 
 #include "stopwatch.hpp"
 
@@ -38,3 +39,65 @@ struct test_stopwatch {
                   << (double(ts) / double(Loops * N)) << " us/d" << std::endl;
     }
 };
+
+template <bool V>
+struct test_verify;
+
+template <>
+struct test_verify<false> {
+    test_verify   (int)      {}
+    void prepare  (void*)    {}
+    void push_data(int, ...) {}
+    void verify   (int, int) {}
+};
+
+template <typename T>
+struct test_cq;
+
+template <int N, int M, int Loops, bool V = true, typename T>
+void benchmark_prod_cons(T* cq) {
+    test_cq<T> tcq { cq };
+
+    std::thread producers[N];
+    std::thread consumers[M];
+    std::atomic_int fini { 0 };
+
+    test_stopwatch sw;
+    test_verify<V> vf { M };
+
+    int cid = 0;
+    for (auto& t : consumers) {
+        t = std::thread{[&, cid] {
+            vf.prepare(&t);
+            auto cn = tcq.connect();
+
+            using namespace std::placeholders;
+            tcq.recv(cn, std::bind(&test_verify<V>::push_data, &vf, cid, _1));
+
+            tcq.disconnect(cn);
+            if (++fini != std::extent<decltype(consumers)>::value) return;
+            sw.print_elapsed(N, M, Loops);
+            vf.verify(N, Loops);
+        }};
+        ++cid;
+    }
+
+    tcq.wait_start(M);
+
+    std::cout << "start producers..." << std::endl;
+    int pid = 0;
+    for (auto& t : producers) {
+        t = std::thread{[&, pid] {
+            sw.start();
+            for (int i = 0; i < Loops; ++i) {
+                tcq.send({ pid, i });
+            }
+        }};
+        ++pid;
+    }
+    for (auto& t : producers) t.join();
+    // quit
+    tcq.send({ -1, -1 });
+
+    for (auto& t : consumers) t.join();
+}
diff --git a/test/test_circ.cpp b/test/test_circ.cpp
index af1be9b..9363e2c 100644
--- a/test/test_circ.cpp
+++ b/test/test_circ.cpp
@@ -13,65 +13,16 @@
 
 namespace {
 
-class Unit : public TestSuite {
-    Q_OBJECT
-
-    const char* name() const {
-        return "test_circ";
-    }
-
-private slots:
-    void initTestCase();
-    void cleanupTestCase();
-
-    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__;
-
-#include "test_circ.moc"
-
 using cq_t = ipc::circ::elem_array<12>;
 cq_t* cq__;
 
-constexpr int LoopCount = 1000000;
-
-void Unit::initTestCase() {
-    TestSuite::initTestCase();
-    cq__ = new cq_t;
-}
-
-void Unit::cleanupTestCase() {
-    delete cq__;
-}
-
-void Unit::test_inst() {
-    std::cout << "cq_t::head_size  = " << cq_t::head_size  << std::endl;
-    std::cout << "cq_t::data_size  = " << cq_t::data_size  << std::endl;
-    std::cout << "cq_t::elem_size  = " << cq_t::elem_size  << std::endl;
-    std::cout << "cq_t::block_size = " << cq_t::block_size << std::endl;
-
-    QCOMPARE(static_cast<std::size_t>(cq_t::data_size) , static_cast<std::size_t>(12));
-    QCOMPARE(sizeof(cq_t), static_cast<std::size_t>(cq_t::block_size + cq_t::head_size));
-
-    std::cout << "sizeof(ipc::circ::elem_array<4096>) = " << sizeof(*cq__) << std::endl;
-
-    auto a = cq__->take(1);
-    auto b = cq__->take(2);
-    QCOMPARE(static_cast<std::size_t>(static_cast<ipc::byte_t*>(b) -
-                                      static_cast<ipc::byte_t*>(a)),
-             static_cast<std::size_t>(cq_t::elem_size));
-}
-
 struct msg_t {
     int pid_;
     int dat_;
 };
 
+} // internal-linkage
+
 template <bool V>
 struct test_verify {
     std::unordered_map<int, std::vector<int>>* list_;
@@ -112,17 +63,6 @@ struct test_verify {
     }
 };
 
-template <>
-struct test_verify<false> {
-    test_verify   (int)                {}
-    void prepare  (void*)              {}
-    void push_data(int, msg_t const &) {}
-    void verify   (int, int)           {}
-};
-
-template <typename T>
-struct test_cq;
-
 template <std::size_t D>
 struct test_cq<ipc::circ::elem_array<D>> {
     using ca_t = ipc::circ::elem_array<D>;
@@ -217,57 +157,62 @@ struct test_cq<ipc::circ::queue<T>> {
     }
 };
 
-template <int N, int M, bool V = true, int Loops = LoopCount, typename T>
-void test_prod_cons(T* cq) {
-    test_cq<T> tcq { cq };
+namespace {
 
-    std::thread producers[N];
-    std::thread consumers[M];
-    std::atomic_int fini { 0 };
+class Unit : public TestSuite {
+    Q_OBJECT
 
-    test_stopwatch sw;
-    test_verify<V> vf { M };
-
-    int cid = 0;
-    for (auto& t : consumers) {
-        t = std::thread{[&, cid] {
-            vf.prepare(&t);
-            auto cn = tcq.connect();
-
-            using namespace std::placeholders;
-            tcq.recv(cn, std::bind(&test_verify<V>::push_data, &vf, cid, _1));
-
-            tcq.disconnect(cn);
-            if (++fini != std::extent<decltype(consumers)>::value) return;
-            sw.print_elapsed(N, M, Loops);
-            vf.verify(N, Loops);
-        }};
-        ++cid;
+    const char* name() const {
+        return "test_circ";
     }
 
-    tcq.wait_start(M);
+private slots:
+    void initTestCase();
+    void cleanupTestCase();
 
-    std::cout << "start producers..." << std::endl;
-    int pid = 0;
-    for (auto& t : producers) {
-        t = std::thread{[&, pid] {
-            sw.start();
-            for (int i = 0; i < Loops; ++i) {
-                tcq.send({ pid, i });
-            }
-        }};
-        ++pid;
-    }
-    for (auto& t : producers) t.join();
-    // quit
-    tcq.send({ -1, -1 });
+    void test_inst();
+    void test_prod_cons_1v1();
+    void test_prod_cons_1v3();
+    void test_prod_cons_3v1();
+    void test_prod_cons_performance();
 
-    for (auto& t : consumers) t.join();
+    void test_queue();
+} unit__;
+
+#include "test_circ.moc"
+
+constexpr int LoopCount = 1000000;
+
+void Unit::initTestCase() {
+    TestSuite::initTestCase();
+    cq__ = new cq_t;
+}
+
+void Unit::cleanupTestCase() {
+    delete cq__;
+}
+
+void Unit::test_inst() {
+    std::cout << "cq_t::head_size  = " << cq_t::head_size  << std::endl;
+    std::cout << "cq_t::data_size  = " << cq_t::data_size  << std::endl;
+    std::cout << "cq_t::elem_size  = " << cq_t::elem_size  << std::endl;
+    std::cout << "cq_t::block_size = " << cq_t::block_size << std::endl;
+
+    QCOMPARE(static_cast<std::size_t>(cq_t::data_size) , static_cast<std::size_t>(12));
+    QCOMPARE(sizeof(cq_t), static_cast<std::size_t>(cq_t::block_size + cq_t::head_size));
+
+    std::cout << "sizeof(ipc::circ::elem_array<4096>) = " << sizeof(*cq__) << std::endl;
+
+    auto a = cq__->take(1);
+    auto b = cq__->take(2);
+    QCOMPARE(static_cast<std::size_t>(static_cast<ipc::byte_t*>(b) -
+                                      static_cast<ipc::byte_t*>(a)),
+             static_cast<std::size_t>(cq_t::elem_size));
 }
 
 template <int N, int M, bool V = true, int Loops = LoopCount>
 void test_prod_cons() {
-    test_prod_cons<N, M, V, Loops>(cq__);
+    benchmark_prod_cons<N, M, Loops, V>(cq__);
 }
 
 void Unit::test_prod_cons_1v1() {
@@ -354,9 +299,9 @@ void Unit::test_queue() {
     queue.attach(cq);
     QVERIFY(queue.detach() != nullptr);
 
-    test_prod_cons<1, 3>((ipc::circ::queue<msg_t>*)nullptr);
-    test_prod_cons<3, 1>((ipc::circ::queue<msg_t>*)nullptr);
-    test_prod_cons<3, 3>((ipc::circ::queue<msg_t>*)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);
 }
 
 } // internal-linkage
diff --git a/test/test_ipc.cpp b/test/test_ipc.cpp
index 5be252e..92d88a4 100644
--- a/test/test_ipc.cpp
+++ b/test/test_ipc.cpp
@@ -9,6 +9,9 @@
 #include <string>
 #include <cstring>
 #include <algorithm>
+#include <array>
+#include <limits>
+#include <utility>
 
 #if defined(__GNUC__)
 #   include <cxxabi.h>  // abi::__cxa_demangle
@@ -18,10 +21,88 @@
 #include "rw_lock.h"
 #include "stopwatch.hpp"
 #include "spin_lock.hpp"
+#include "random.hpp"
 #include "test.h"
 
 namespace {
 
+std::vector<ipc::buff_t> datas__;
+
+constexpr int DataMin   = 2;
+constexpr int DataMax   = 512;
+constexpr int LoopCount = 100/*0*//*000*/;
+
+} // internal-linkage
+
+template <>
+struct test_cq<ipc::channel> {
+    using cn_t = ipc::channel;
+
+    std::string conn_name_;
+    std::size_t conn_count_ = 0;
+
+    test_cq(void*)
+        : conn_name_("test-ipc-channel")
+    {}
+
+    cn_t connect() {
+        cn_t cn { conn_name_.c_str() };
+        conn_count_ = cn.conn_count();
+        return cn;
+    }
+
+    void disconnect(cn_t&) {}
+
+    void wait_start(int M) {
+        while (conn_count_ != static_cast<std::size_t>(M)) {
+            std::this_thread::yield();
+        }
+    }
+
+    template <typename F>
+    void recv(cn_t& cn, F&& proc) {
+        do {
+            auto msg = cn.recv();
+            if (msg.size() < 2) return;
+            proc(msg);
+        } while(1);
+    }
+
+    void send(const std::array<int, 2>& info) {
+        thread_local auto cn = connect();
+        int n = info[1];
+        if (n < 0) {
+            cn.send(ipc::buff_t { '\0' });
+        }
+        else cn.send(datas__[n]);
+    }
+};
+
+//template <>
+//struct test_verify<true> {
+//    std::unordered_map<int, std::vector<ipc::buff_t>> list_;
+//    int lcount_;
+
+//    test_verify(int M) : lcount_{ M } {}
+
+//    void prepare(void* pt) {
+//        std::cout << "start consumer: " << pt << std::endl;
+//    }
+
+//    void push_data(int cid, ipc::buff_t const & msg) {
+//        list_[cid].emplace_back(std::move(msg));
+//    }
+
+//    void verify(int /*N*/, int /*Loops*/) {
+//        std::cout << "verifying..." << std::endl;
+//        for (int m = 0; m < lcount_; ++m) {
+//            QCOMPARE(datas__, list_[m]);
+//        }
+//    }
+//};
+
+namespace {
+
 class Unit : public TestSuite {
     Q_OBJECT
 
@@ -30,13 +111,37 @@ class Unit : public TestSuite {
     }
 
 private slots:
+    void initTestCase();
+    void cleanupTestCase();
+
     void test_rw_lock();
     void test_send_recv();
     void test_channel();
+    void test_channel_performance();
 } unit__;
 
 #include "test_ipc.moc"
 
+void Unit::initTestCase() {
+    TestSuite::initTestCase();
+
+    capo::random<> rdm { DataMin, DataMax };
+    capo::random<> bit { 0, (std::numeric_limits<ipc::buff_t::value_type>::max)() };
+
+    for (int i = 0; i < LoopCount; ++i) {
+        auto n = rdm();
+        ipc::buff_t buff(static_cast<ipc::buff_t::size_type>(n));
+        for (std::size_t k = 0; k < buff.size(); ++k) {
+            buff[k] = static_cast<ipc::buff_t::value_type>(bit());
+        }
+        datas__.emplace_back(std::move(buff));
+    }
+}
+
+void Unit::cleanupTestCase() {
+    datas__.clear();
+}
+
 template <typename T>
 constexpr T acc(T b, T e) {
     return (e + b) * (e - b + 1) / 2;
@@ -235,4 +340,8 @@ void Unit::test_channel() {
     t2.join();
 }
 
+void Unit::test_channel_performance() {
+    benchmark_prod_cons<1, 1, LoopCount, false>((ipc::channel*)nullptr);
+}
+
 } // internal-linkage