Tests: Add tests for fibers and refactor/fix Fiber class

src/common/fiber.cpp

@@ -3,18 +3,21 @@
 // Refer to the license.txt file included.
 
 #include "common/fiber.h"
+#ifdef _MSC_VER
+#include <windows.h>
+#else
+#include <boost/context/detail/fcontext.hpp>
+#endif
 
 namespace Common {
 
 #ifdef _MSC_VER
-#include <windows.h>
 
 struct Fiber::FiberImpl {
     LPVOID handle = nullptr;
 };
 
-void Fiber::_start([[maybe_unused]] void* parameter) {
-    guard.lock();
+void Fiber::start() {
     if (previous_fiber) {
         previous_fiber->guard.unlock();
         previous_fiber = nullptr;
@@ -22,10 +25,10 @@ void Fiber::_start([[maybe_unused]] void* parameter) {
     entry_point(start_parameter);
 }
 
-static void __stdcall FiberStartFunc(LPVOID lpFiberParameter)
+void __stdcall Fiber::FiberStartFunc(void* fiber_parameter)
 {
-   auto fiber = static_cast<Fiber *>(lpFiberParameter);
-   fiber->_start(nullptr);
+   auto fiber = static_cast<Fiber *>(fiber_parameter);
+   fiber->start();
 }
 
 Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
@@ -74,30 +77,26 @@ std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
 
 #else
 
-#include <boost/context/detail/fcontext.hpp>
-
 constexpr std::size_t default_stack_size = 1024 * 1024 * 4; // 4MB
 
-struct Fiber::FiberImpl {
-    boost::context::detail::fcontext_t context;
+struct alignas(64) Fiber::FiberImpl {
     std::array<u8, default_stack_size> stack;
+    boost::context::detail::fcontext_t context;
 };
 
-void Fiber::_start(void* parameter) {
-    guard.lock();
-    boost::context::detail::transfer_t* transfer = static_cast<boost::context::detail::transfer_t*>(parameter);
+void Fiber::start(boost::context::detail::transfer_t& transfer) {
     if (previous_fiber) {
-        previous_fiber->impl->context = transfer->fctx;
+        previous_fiber->impl->context = transfer.fctx;
         previous_fiber->guard.unlock();
         previous_fiber = nullptr;
     }
     entry_point(start_parameter);
 }
 
-static void FiberStartFunc(boost::context::detail::transfer_t transfer)
+void Fiber::FiberStartFunc(boost::context::detail::transfer_t transfer)
 {
    auto fiber = static_cast<Fiber *>(transfer.data);
-   fiber->_start(&transfer);
+   fiber->start(transfer);
 }
 
 Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
@@ -139,6 +138,7 @@ void Fiber::YieldTo(std::shared_ptr<Fiber> from, std::shared_ptr<Fiber> to) {
 
 std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
     std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
+    fiber->guard.lock();
     fiber->is_thread_fiber = true;
     return fiber;
 }

src/common/fiber.h

@@ -10,6 +10,12 @@
 #include "common/common_types.h"
 #include "common/spin_lock.h"
 
+#ifndef _MSC_VER
+namespace boost::context::detail {
+    struct transfer_t;
+}
+#endif
+
 namespace Common {
 
 class Fiber {
@@ -31,9 +37,6 @@ public:
     /// Only call from main thread's fiber
     void Exit();
 
-    /// Used internally but required to be public, Shall not be used
-    void _start(void* parameter);
-
     /// Changes the start parameter of the fiber. Has no effect if the fiber already started
     void SetStartParameter(void* new_parameter) {
         start_parameter = new_parameter;
@@ -42,6 +45,16 @@ public:
 private:
     Fiber();
 
+#ifdef _MSC_VER
+    void start();
+    static void FiberStartFunc(void* fiber_parameter);
+#else
+    void start(boost::context::detail::transfer_t& transfer);
+    static void FiberStartFunc(boost::context::detail::transfer_t transfer);
+#endif
+
+
+
     struct FiberImpl;
 
     SpinLock guard;

src/tests/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_executable(tests
     common/bit_field.cpp
     common/bit_utils.cpp
+    common/fibers.cpp
     common/multi_level_queue.cpp
     common/param_package.cpp
     common/ring_buffer.cpp

src/tests/common/fibers.cpp

@@ -0,0 +1,214 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <cstdlib>
+#include <functional>
+#include <memory>
+#include <thread>
+#include <unordered_map>
+#include <vector>
+
+#include <catch2/catch.hpp>
+#include <math.h>
+#include "common/common_types.h"
+#include "common/fiber.h"
+#include "common/spin_lock.h"
+
+namespace Common {
+
+class TestControl1 {
+public:
+    TestControl1() = default;
+
+    void DoWork();
+
+    void ExecuteThread(u32 id);
+
+    std::unordered_map<std::thread::id, u32> ids;
+    std::vector<std::shared_ptr<Common::Fiber>> thread_fibers;
+    std::vector<std::shared_ptr<Common::Fiber>> work_fibers;
+    std::vector<u32> items;
+    std::vector<u32> results;
+};
+
+static void WorkControl1(void* control) {
+    TestControl1* test_control = static_cast<TestControl1*>(control);
+    test_control->DoWork();
+}
+
+void TestControl1::DoWork() {
+    std::thread::id this_id = std::this_thread::get_id();
+    u32 id = ids[this_id];
+    u32 value = items[id];
+    for (u32 i = 0; i < id; i++) {
+        value++;
+    }
+    results[id] = value;
+    Fiber::YieldTo(work_fibers[id], thread_fibers[id]);
+}
+
+void TestControl1::ExecuteThread(u32 id) {
+    std::thread::id this_id = std::this_thread::get_id();
+    ids[this_id] = id;
+    auto thread_fiber = Fiber::ThreadToFiber();
+    thread_fibers[id] = thread_fiber;
+    work_fibers[id] = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl1}, this);
+    items[id] = rand() % 256;
+    Fiber::YieldTo(thread_fibers[id], work_fibers[id]);
+    thread_fibers[id]->Exit();
+}
+
+static void ThreadStart1(u32 id, TestControl1& test_control) {
+    test_control.ExecuteThread(id);
+}
+
+
+TEST_CASE("Fibers::Setup", "[common]") {
+    constexpr u32 num_threads = 7;
+    TestControl1 test_control{};
+    test_control.thread_fibers.resize(num_threads, nullptr);
+    test_control.work_fibers.resize(num_threads, nullptr);
+    test_control.items.resize(num_threads, 0);
+    test_control.results.resize(num_threads, 0);
+    std::vector<std::thread> threads;
+    for (u32 i = 0; i < num_threads; i++) {
+        threads.emplace_back(ThreadStart1, i, std::ref(test_control));
+    }
+    for (u32 i = 0; i < num_threads; i++) {
+        threads[i].join();
+    }
+    for (u32 i = 0; i < num_threads; i++) {
+        REQUIRE(test_control.items[i] + i == test_control.results[i]);
+    }
+}
+
+class TestControl2 {
+public:
+    TestControl2() = default;
+
+    void DoWork1() {
+        trap2 = false;
+        while (trap.load());
+        for (u32 i = 0; i < 12000; i++) {
+            value1 += i;
+        }
+        Fiber::YieldTo(fiber1, fiber3);
+        std::thread::id this_id = std::this_thread::get_id();
+        u32 id = ids[this_id];
+        assert1 = id == 1;
+        value2 += 5000;
+        Fiber::YieldTo(fiber1, thread_fibers[id]);
+    }
+
+    void DoWork2() {
+        while (trap2.load());
+        value2 = 2000;
+        trap = false;
+        Fiber::YieldTo(fiber2, fiber1);
+        assert3 = false;
+    }
+
+    void DoWork3() {
+        std::thread::id this_id = std::this_thread::get_id();
+        u32 id = ids[this_id];
+        assert2 = id == 0;
+        value1 += 1000;
+        Fiber::YieldTo(fiber3, thread_fibers[id]);
+    }
+
+    void ExecuteThread(u32 id);
+
+    void CallFiber1() {
+        std::thread::id this_id = std::this_thread::get_id();
+        u32 id = ids[this_id];
+        Fiber::YieldTo(thread_fibers[id], fiber1);
+    }
+
+    void CallFiber2() {
+        std::thread::id this_id = std::this_thread::get_id();
+        u32 id = ids[this_id];
+        Fiber::YieldTo(thread_fibers[id], fiber2);
+    }
+
+    void Exit();
+
+    bool assert1{};
+    bool assert2{};
+    bool assert3{true};
+    u32 value1{};
+    u32 value2{};
+    std::atomic<bool> trap{true};
+    std::atomic<bool> trap2{true};
+    std::unordered_map<std::thread::id, u32> ids;
+    std::vector<std::shared_ptr<Common::Fiber>> thread_fibers;
+    std::shared_ptr<Common::Fiber> fiber1;
+    std::shared_ptr<Common::Fiber> fiber2;
+    std::shared_ptr<Common::Fiber> fiber3;
+};
+
+static void WorkControl2_1(void* control) {
+    TestControl2* test_control = static_cast<TestControl2*>(control);
+    test_control->DoWork1();
+}
+
+static void WorkControl2_2(void* control) {
+    TestControl2* test_control = static_cast<TestControl2*>(control);
+    test_control->DoWork2();
+}
+
+static void WorkControl2_3(void* control) {
+    TestControl2* test_control = static_cast<TestControl2*>(control);
+    test_control->DoWork3();
+}
+
+void TestControl2::ExecuteThread(u32 id) {
+    std::thread::id this_id = std::this_thread::get_id();
+    ids[this_id] = id;
+    auto thread_fiber = Fiber::ThreadToFiber();
+    thread_fibers[id] = thread_fiber;
+}
+
+void TestControl2::Exit() {
+    std::thread::id this_id = std::this_thread::get_id();
+    u32 id = ids[this_id];
+    thread_fibers[id]->Exit();
+}
+
+static void ThreadStart2_1(u32 id, TestControl2& test_control) {
+    test_control.ExecuteThread(id);
+    test_control.CallFiber1();
+    test_control.Exit();
+}
+
+static void ThreadStart2_2(u32 id, TestControl2& test_control) {
+    test_control.ExecuteThread(id);
+    test_control.CallFiber2();
+    test_control.Exit();
+}
+
+TEST_CASE("Fibers::InterExchange", "[common]") {
+    TestControl2 test_control{};
+    test_control.thread_fibers.resize(2, nullptr);
+    test_control.fiber1 = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl2_1}, &test_control);
+    test_control.fiber2 = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl2_2}, &test_control);
+    test_control.fiber3 = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl2_3}, &test_control);
+    std::thread thread1(ThreadStart2_1, 0, std::ref(test_control));
+    std::thread thread2(ThreadStart2_2, 1, std::ref(test_control));
+    thread1.join();
+    thread2.join();
+    REQUIRE(test_control.assert1);
+    REQUIRE(test_control.assert2);
+    REQUIRE(test_control.assert3);
+    REQUIRE(test_control.value2 == 7000);
+    u32 cal_value = 0;
+    for (u32 i = 0; i < 12000; i++) {
+        cal_value += i;
+    }
+    cal_value += 1000;
+    REQUIRE(test_control.value1 == cal_value);
+}
+
+
+} // namespace Common