Roughing in more scheduler and threadpool

daggy/CMakeLists.txt

@@ -3,7 +3,7 @@ project(daggy)
 #ExternalProject_Add_StepDependencies(pistache_extern build)
 
 file(GLOB SOURCES src/*.cpp src/**/*.cpp)
-add_library(${PROJECT_NAME} STATIC ${SOURCES})
+add_library(${PROJECT_NAME} STATIC ${SOURCES} src/Scheduler.cpp)
 include_directories(${PISTACHE_INCLUDE_DIR})
 target_include_directories(${PROJECT_NAME} PUBLIC include)
 target_link_libraries(${PROJECT_NAME} pistache pthread)

daggy/include/daggy/Scheduler.hpp

@@ -14,12 +14,17 @@ namespace daggy {
   class Scheduler {
     public:
       // Register an executor
-      void registerExecutor(std::shared_ptr<Executor> executor);
-      void runTasks(std::vector<Task> tasks, std::unordered_map<std::string, ParameterValue> parameters);
+      void registerExecutor(std::shared_ptr<Executor> executor
+                            , size_t maxParallelTasks
+      );
+      void runTasks(std::vector<Task> tasks
+                    , std::unordered_map<std::string, ParameterValue> parameters)
+                    , DAG dag = {} // Allows for loading of an existing DAG
+      );
 
     private:
-      std::unordered_map<std::string, std::shared_ptr<Executor>> executors;
-      std::unordered_map<std::string, std::vector<std::future<TaskResult>>> jobs;
-      std::vector<Parameter> parameters;
+      std::unordered_map<std::string, std::shared_ptr<Executor>> executors_;
+      std::unordered_map<std::string, std::vector<std::future<TaskResult>>> jobs_;
+      std::unordered_map<std::string, ParameterValue> parameters_;
   };
 }

daggy/include/daggy/ThreadPool.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <atomic>
+#include <thread>
+#include <vector>
+#include <memory>
+#include <condition_variable>
+
+namespace daggy {
+  class ThreadPool {
+    public:
+      ThreadPool(size_t nWorkers);
+    private:
+      std::atomic<bool>        shutdown_;
+      std::mutex               guard_;
+      std::condition_variable  cv_;
+      std::vector<std::thread> workers;
+  };
+}

daggy/src/Scheduler.cpp

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace daggy {
+  void Scheduler::registerExecutor(std::shared_ptr<Executor> executor, size_t maxParallelTasks) {
+    executors_.emplace(executor->getName(), executor);
+  }
+}