From 9776ff91797423a9cf19571faafe4648fb5a1d1d Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 2 May 2018 21:26:14 -0400
Subject: core: Create a thread for each CPU core, keep in lock-step with a
 barrier.

---
 src/core/core.cpp | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

(limited to 'src/core/core.cpp')

diff --git a/src/core/core.cpp b/src/core/core.cpp
index 0af78c18c..066423f23 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -27,6 +27,13 @@ namespace Core {
 
 System::~System() = default;
 
+/// Runs a CPU core while the system is powered on
+static void RunCpuCore(std::shared_ptr<Cpu> cpu_state) {
+    while (Core::System().GetInstance().IsPoweredOn()) {
+        cpu_state->RunLoop(true);
+    }
+}
+
 System::ResultStatus System::RunLoop(bool tight_loop) {
     status = ResultStatus::Success;
 
@@ -109,7 +116,7 @@ System::ResultStatus System::Load(EmuWindow* emu_window, const std::string& file
 }
 
 void System::PrepareReschedule() {
-    cpu_cores[0]->PrepareReschedule();
+    CurrentCpuCore().PrepareReschedule();
 }
 
 PerfStats::Results System::GetAndResetPerfStats() {
@@ -123,14 +130,13 @@ System::ResultStatus System::Init(EmuWindow* emu_window, u32 system_mode) {
 
     current_process = Kernel::Process::Create("main");
 
-    for (auto& cpu_core : cpu_cores) {
-        cpu_core = std::make_unique<Cpu>();
+    cpu_barrier = std::make_shared<CpuBarrier>();
+    for (size_t index = 0; index < cpu_cores.size(); ++index) {
+        cpu_cores[index] = std::make_shared<Cpu>(cpu_barrier, index);
     }
 
     gpu_core = std::make_unique<Tegra::GPU>();
-
     telemetry_session = std::make_unique<Core::TelemetrySession>();
-
     service_manager = std::make_shared<Service::SM::ServiceManager>();
 
     HW::Init();
@@ -142,6 +148,14 @@ System::ResultStatus System::Init(EmuWindow* emu_window, u32 system_mode) {
         return ResultStatus::ErrorVideoCore;
     }
 
+    // Create threads for CPU cores 1-3, and build thread_to_cpu map
+    // CPU core 0 is run on the main thread
+    thread_to_cpu[std::this_thread::get_id()] = cpu_cores[0];
+    for (size_t index = 0; index < cpu_core_threads.size(); ++index) {
+        cpu_core_threads[index] = std::make_unique<std::thread>(RunCpuCore, cpu_cores[index + 1]);
+        thread_to_cpu[cpu_core_threads[index]->get_id()] = cpu_cores[index + 1];
+    }
+
     NGLOG_DEBUG(Core, "Initialized OK");
 
     // Reset counters and set time origin to current frame
@@ -171,9 +185,15 @@ void System::Shutdown() {
     telemetry_session.reset();
     gpu_core.reset();
 
+    // Close all CPU/threading state
+    thread_to_cpu.clear();
     for (auto& cpu_core : cpu_cores) {
         cpu_core.reset();
     }
+    for (auto& thread : cpu_core_threads) {
+        thread->join();
+        thread.reset();
+    }
 
     CoreTiming::Shutdown();
 
-- 
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