6 files changed, 203 insertions, 0 deletions
diff --git a/src/core.cpp b/src/core.cpp
index 1efaedc..3a78af2 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -69,6 +69,22 @@ vk_debug_callback(
 #endif
 
 void
+load_threads(void *obj)
+{
+  auto num_threads{std::thread::hardware_concurrency() - 1};
+  for(auto i{0}; i < num_threads; i++)
+    cg_core.threads.emplace_back(
+      cg_core.workers.emplace_back(&cg_core.job_queue));
+}
+
+void
+unload_threads(void *obj)
+{
+  cg_core.job_queue.stop();
+  for(auto &t: cg_core.threads) t.join();
+}
+
+void
 load_mruby_symbols(void *obj)
 {
   cg_core.sym_config = mrb_intern_cstr(cg_core.mrb, "config");
@@ -636,6 +652,7 @@ load_mruby_interface(void *obj)
 }
 
 const CommandChain cg_sCore::loader{
+  {&load_threads, &unload_threads},
   {&load_mruby_symbols, nullptr},
   {&load_game, nullptr},
   {&load_sdl, &unload_sdl},
diff --git a/src/core.hpp b/src/core.hpp
index 5a1556a..0830a49 100644
--- a/src/core.hpp
+++ b/src/core.hpp
@@ -41,7 +41,9 @@
 #include <SDL2/SDL_mixer.h>
 
 #include "command.hpp"
+#include "job_queue.hpp"
 #include "log.hpp"
+#include "worker.hpp"
 
 #include "vk/device.hpp"
 #include "vk/graphics_pipeline_3d_layout.hpp"
@@ -64,6 +66,10 @@ struct cg_sCore
 
   Log::Logger log;
 
+  JobQueue job_queue;
+  std::vector<Worker> workers;
+  std::vector<std::thread> threads;
+
   mrb_state *mrb;
 
   std::string game_file;
diff --git a/src/job_queue.cpp b/src/job_queue.cpp
new file mode 100644
index 0000000..49bf34f
--- /dev/null
+++ b/src/job_queue.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "job_queue.hpp"
+
+#include <chrono>
+
+JobQueue::JobQueue():
+  jobs{},
+  _stop{false}
+{
+}
+
+void
+JobQueue::stop()
+{
+  using namespace std::chrono_literals;
+
+  while(!this->jobs.empty()) std::this_thread::sleep_for(1000ms);
+  this->_stop = true;
+  this->condition.notify_all();
+}
+
+void
+JobQueue::push(Job job)
+{
+  std::unique_lock<std::mutex> lock{this->access};
+  this->jobs.push_back(job);
+  this->condition.notify_one();
+}
+
+Job
+JobQueue::pop()
+{
+  std::unique_lock<std::mutex> lock{this->access};
+  this->condition.wait(lock, [this]{
+    return !this->jobs.empty() || this->_stop;});
+  if(!this->jobs.empty())
+  {
+    auto job{std::move(this->jobs.front())};
+    this->jobs.pop_front();
+    return job;
+  }
+  else
+  {
+    return Job{nullptr};
+  }
+}
diff --git a/src/job_queue.hpp b/src/job_queue.hpp
new file mode 100644
index 0000000..2a7735b
--- /dev/null
+++ b/src/job_queue.hpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_JOB_QUEUE_H
+#define CANDY_GEAR_JOB_QUEUE_H 1
+
+#include <atomic>
+#include <condition_variable>
+#include <deque>
+#include <functional>
+#include <mutex>
+
+class Worker;
+
+typedef std::function<void(void)> Job;
+
+class JobQueue
+{
+  friend Worker;
+
+  std::mutex access;
+  std::condition_variable condition;
+  std::atomic<bool> _stop;
+  std::deque<Job> jobs;
+
+  Job
+  pop();
+
+public:
+  JobQueue();
+
+  void
+  stop();
+
+  void
+  push(Job job);
+};
+
+#endif /* CANDY_GEAR_JOB_QUEUE_H */
diff --git a/src/worker.cpp b/src/worker.cpp
new file mode 100644
index 0000000..bcf654e
--- /dev/null
+++ b/src/worker.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "worker.hpp"
+
+#include <thread>
+
+Worker::Worker(JobQueue *job_queue):
+  job_queue{job_queue}
+{
+}
+
+void
+Worker::operator()()
+{
+  while(!this->job_queue->_stop)
+  {
+    auto job{this->job_queue->pop()};
+    if(job) job();
+  }
+}
diff --git a/src/worker.hpp b/src/worker.hpp
new file mode 100644
index 0000000..449e1b0
--- /dev/null
+++ b/src/worker.hpp
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_WORKER_H
+#define CANDY_GEAR_WORKER_H 1
+
+#include "job_queue.hpp"
+
+class Worker
+{
+  JobQueue *job_queue;
+
+public:
+  Worker(JobQueue *job_queue);
+
+  void
+  operator()();
+};
+
+#endif /* CANDY_GEAR_WORKER_H */