3 files changed, 502 insertions, 0 deletions

diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index c7038b217..3f750b51c 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -1,12 +1,14 @@
 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
     core/arm/arm_test_common.cpp
     core/arm/arm_test_common.h
     core/core_timing.cpp
+    core/host_timing.cpp
     tests.cpp
 )
 
diff --git a/src/tests/common/fibers.cpp b/src/tests/common/fibers.cpp
new file mode 100644
index 000000000..12536b6d8
--- /dev/null
+++ b/src/tests/common/fibers.cpp
@@ -0,0 +1,358 @@
+// 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) {
+    auto* 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);
+}
+
+/** This test checks for fiber setup configuration and validates that fibers are
+ *  doing all the work required.
+ */
+TEST_CASE("Fibers::Setup", "[common]") {
+    constexpr u32 num_threads = 7;
+    TestControl1 test_control{};
+    test_control.thread_fibers.resize(num_threads);
+    test_control.work_fibers.resize(num_threads);
+    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) {
+    auto* test_control = static_cast<TestControl2*>(control);
+    test_control->DoWork1();
+}
+
+static void WorkControl2_2(void* control) {
+    auto* test_control = static_cast<TestControl2*>(control);
+    test_control->DoWork2();
+}
+
+static void WorkControl2_3(void* control) {
+    auto* 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();
+}
+
+/** This test checks for fiber thread exchange configuration and validates that fibers are
+ *  that a fiber has been succesfully transfered from one thread to another and that the TLS
+ *  region of the thread is kept while changing fibers.
+ */
+TEST_CASE("Fibers::InterExchange", "[common]") {
+    TestControl2 test_control{};
+    test_control.thread_fibers.resize(2);
+    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);
+}
+
+class TestControl3 {
+public:
+    TestControl3() = default;
+
+    void DoWork1() {
+        value1 += 1;
+        Fiber::YieldTo(fiber1, fiber2);
+        std::thread::id this_id = std::this_thread::get_id();
+        u32 id = ids[this_id];
+        value3 += 1;
+        Fiber::YieldTo(fiber1, thread_fibers[id]);
+    }
+
+    void DoWork2() {
+        value2 += 1;
+        std::thread::id this_id = std::this_thread::get_id();
+        u32 id = ids[this_id];
+        Fiber::YieldTo(fiber2, 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 Exit();
+
+    u32 value1{};
+    u32 value2{};
+    u32 value3{};
+    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;
+};
+
+static void WorkControl3_1(void* control) {
+    auto* test_control = static_cast<TestControl3*>(control);
+    test_control->DoWork1();
+}
+
+static void WorkControl3_2(void* control) {
+    auto* test_control = static_cast<TestControl3*>(control);
+    test_control->DoWork2();
+}
+
+void TestControl3::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 TestControl3::Exit() {
+    std::thread::id this_id = std::this_thread::get_id();
+    u32 id = ids[this_id];
+    thread_fibers[id]->Exit();
+}
+
+static void ThreadStart3(u32 id, TestControl3& test_control) {
+    test_control.ExecuteThread(id);
+    test_control.CallFiber1();
+    test_control.Exit();
+}
+
+/** This test checks for one two threads racing for starting the same fiber.
+ *  It checks execution occured in an ordered manner and by no time there were
+ *  two contexts at the same time.
+ */
+TEST_CASE("Fibers::StartRace", "[common]") {
+    TestControl3 test_control{};
+    test_control.thread_fibers.resize(2);
+    test_control.fiber1 =
+        std::make_shared<Fiber>(std::function<void(void*)>{WorkControl3_1}, &test_control);
+    test_control.fiber2 =
+        std::make_shared<Fiber>(std::function<void(void*)>{WorkControl3_2}, &test_control);
+    std::thread thread1(ThreadStart3, 0, std::ref(test_control));
+    std::thread thread2(ThreadStart3, 1, std::ref(test_control));
+    thread1.join();
+    thread2.join();
+    REQUIRE(test_control.value1 == 1);
+    REQUIRE(test_control.value2 == 1);
+    REQUIRE(test_control.value3 == 1);
+}
+
+class TestControl4;
+
+static void WorkControl4(void* control);
+
+class TestControl4 {
+public:
+    TestControl4() {
+        fiber1 = std::make_shared<Fiber>(std::function<void(void*)>{WorkControl4}, this);
+        goal_reached = false;
+        rewinded = false;
+    }
+
+    void Execute() {
+        thread_fiber = Fiber::ThreadToFiber();
+        Fiber::YieldTo(thread_fiber, fiber1);
+        thread_fiber->Exit();
+    }
+
+    void DoWork() {
+        fiber1->SetRewindPoint(std::function<void(void*)>{WorkControl4}, this);
+        if (rewinded) {
+            goal_reached = true;
+            Fiber::YieldTo(fiber1, thread_fiber);
+        }
+        rewinded = true;
+        fiber1->Rewind();
+    }
+
+    std::shared_ptr<Common::Fiber> fiber1;
+    std::shared_ptr<Common::Fiber> thread_fiber;
+    bool goal_reached;
+    bool rewinded;
+};
+
+static void WorkControl4(void* control) {
+    auto* test_control = static_cast<TestControl4*>(control);
+    test_control->DoWork();
+}
+
+TEST_CASE("Fibers::Rewind", "[common]") {
+    TestControl4 test_control{};
+    test_control.Execute();
+    REQUIRE(test_control.goal_reached);
+    REQUIRE(test_control.rewinded);
+}
+
+} // namespace Common
diff --git a/src/tests/core/host_timing.cpp b/src/tests/core/host_timing.cpp
new file mode 100644
index 000000000..556254098
--- /dev/null
+++ b/src/tests/core/host_timing.cpp
@@ -0,0 +1,142 @@
+// Copyright 2016 Dolphin Emulator Project / 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <catch2/catch.hpp>
+
+#include <array>
+#include <bitset>
+#include <cstdlib>
+#include <memory>
+#include <string>
+
+#include "common/file_util.h"
+#include "core/core.h"
+#include "core/host_timing.h"
+
+// Numbers are chosen randomly to make sure the correct one is given.
+static constexpr std::array<u64, 5> CB_IDS{{42, 144, 93, 1026, UINT64_C(0xFFFF7FFFF7FFFF)}};
+static constexpr int MAX_SLICE_LENGTH = 10000; // Copied from CoreTiming internals
+static constexpr std::array<u64, 5> calls_order{{2, 0, 1, 4, 3}};
+static std::array<s64, 5> delays{};
+
+static std::bitset<CB_IDS.size()> callbacks_ran_flags;
+static u64 expected_callback = 0;
+
+template <unsigned int IDX>
+void HostCallbackTemplate(u64 userdata, s64 nanoseconds_late) {
+    static_assert(IDX < CB_IDS.size(), "IDX out of range");
+    callbacks_ran_flags.set(IDX);
+    REQUIRE(CB_IDS[IDX] == userdata);
+    REQUIRE(CB_IDS[IDX] == CB_IDS[calls_order[expected_callback]]);
+    delays[IDX] = nanoseconds_late;
+    ++expected_callback;
+}
+
+struct ScopeInit final {
+    ScopeInit() {
+        core_timing.Initialize();
+    }
+    ~ScopeInit() {
+        core_timing.Shutdown();
+    }
+
+    Core::HostTiming::CoreTiming core_timing;
+};
+
+#pragma optimize("", off)
+
+static u64 TestTimerSpeed(Core::HostTiming::CoreTiming& core_timing) {
+    u64 start = core_timing.GetGlobalTimeNs().count();
+    u64 placebo = 0;
+    for (std::size_t i = 0; i < 1000; i++) {
+        placebo += core_timing.GetGlobalTimeNs().count();
+    }
+    u64 end = core_timing.GetGlobalTimeNs().count();
+    return (end - start);
+}
+
+#pragma optimize("", on)
+
+TEST_CASE("HostTiming[BasicOrder]", "[core]") {
+    ScopeInit guard;
+    auto& core_timing = guard.core_timing;
+    std::vector<std::shared_ptr<Core::HostTiming::EventType>> events{
+        Core::HostTiming::CreateEvent("callbackA", HostCallbackTemplate<0>),
+        Core::HostTiming::CreateEvent("callbackB", HostCallbackTemplate<1>),
+        Core::HostTiming::CreateEvent("callbackC", HostCallbackTemplate<2>),
+        Core::HostTiming::CreateEvent("callbackD", HostCallbackTemplate<3>),
+        Core::HostTiming::CreateEvent("callbackE", HostCallbackTemplate<4>),
+    };
+
+    expected_callback = 0;
+
+    core_timing.SyncPause(true);
+
+    u64 one_micro = 1000U;
+    for (std::size_t i = 0; i < events.size(); i++) {
+        u64 order = calls_order[i];
+        core_timing.ScheduleEvent(i * one_micro + 100U, events[order], CB_IDS[order]);
+    }
+    /// test pause
+    REQUIRE(callbacks_ran_flags.none());
+
+    core_timing.Pause(false); // No need to sync
+
+    while (core_timing.HasPendingEvents())
+        ;
+
+    REQUIRE(callbacks_ran_flags.all());
+
+    for (std::size_t i = 0; i < delays.size(); i++) {
+        const double delay = static_cast<double>(delays[i]);
+        const double micro = delay / 1000.0f;
+        const double mili = micro / 1000.0f;
+        printf("HostTimer Pausing Delay[%zu]: %.3f %.6f\n", i, micro, mili);
+    }
+}
+
+TEST_CASE("HostTiming[BasicOrderNoPausing]", "[core]") {
+    ScopeInit guard;
+    auto& core_timing = guard.core_timing;
+    std::vector<std::shared_ptr<Core::HostTiming::EventType>> events{
+        Core::HostTiming::CreateEvent("callbackA", HostCallbackTemplate<0>),
+        Core::HostTiming::CreateEvent("callbackB", HostCallbackTemplate<1>),
+        Core::HostTiming::CreateEvent("callbackC", HostCallbackTemplate<2>),
+        Core::HostTiming::CreateEvent("callbackD", HostCallbackTemplate<3>),
+        Core::HostTiming::CreateEvent("callbackE", HostCallbackTemplate<4>),
+    };
+
+    core_timing.SyncPause(true);
+    core_timing.SyncPause(false);
+
+    expected_callback = 0;
+
+    u64 start = core_timing.GetGlobalTimeNs().count();
+    u64 one_micro = 1000U;
+    for (std::size_t i = 0; i < events.size(); i++) {
+        u64 order = calls_order[i];
+        core_timing.ScheduleEvent(i * one_micro + 100U, events[order], CB_IDS[order]);
+    }
+    u64 end = core_timing.GetGlobalTimeNs().count();
+    const double scheduling_time = static_cast<double>(end - start);
+    const double timer_time = static_cast<double>(TestTimerSpeed(core_timing));
+
+    while (core_timing.HasPendingEvents())
+        ;
+
+    REQUIRE(callbacks_ran_flags.all());
+
+    for (std::size_t i = 0; i < delays.size(); i++) {
+        const double delay = static_cast<double>(delays[i]);
+        const double micro = delay / 1000.0f;
+        const double mili = micro / 1000.0f;
+        printf("HostTimer No Pausing Delay[%zu]: %.3f %.6f\n", i, micro, mili);
+    }
+
+    const double micro = scheduling_time / 1000.0f;
+    const double mili = micro / 1000.0f;
+    printf("HostTimer No Pausing Scheduling Time: %.3f %.6f\n", micro, mili);
+    printf("HostTimer No Pausing Timer Time: %.3f %.6f\n", timer_time / 1000.f,
+           timer_time / 1000000.f);
+}