commit 01be3f95e260bc9485e54de1c739117bf3145bb0
Author: mykola2312 <49044616+mykola2312@users.noreply.github.com>
Date:   Sat Feb 27 17:44:33 2021 +0200

    27.02.2021: worker initial commit.

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..18a22bb
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.18)
+project(worker)
+
+set(SOURCES
+    worker.cpp
+    scheduler.cpp
+)
+
+set(HEADERS
+    worker.h
+    scheduler.h
+)
+
+add_library(worker SHARED ${SOURCES} ${HEADERS})
+target_include_directories(worker PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
diff --git a/scheduler.cpp b/scheduler.cpp
new file mode 100644
index 0000000..1b3f6f6
--- /dev/null
+++ b/scheduler.cpp
@@ -0,0 +1,134 @@
+#include "scheduler.h"
+
+Scheduler::Scheduler(CreateFunc func, unsigned uMaxWorkers)
+{
+    m_Create = func;
+    m_uMaxWorkers = uMaxWorkers;
+}
+
+Scheduler::~Scheduler()
+{
+    for (auto& worker : m_Workers)
+        WorkerDestroy(worker.m_pWorker);
+}
+
+void Scheduler::DoControl()
+{
+    if(GetState() == workstate::INIT)
+        Continue(0);
+    else Wait(WaitObject(SCHEDULER_DELAY));
+}
+
+void Scheduler::DoWork()
+{
+    for (auto it = m_Workers.begin(); it != m_Workers.end(); ++it)
+    {
+        Worker* wrk = it->m_pWorker;
+        printf("wrk %p state %d timer %d\n", wrk,
+                wrk->GetState(), it->m_iTimer);
+
+        try {
+            if (wrk->GetState() == workstate::INIT)
+                wrk->SetState(workstate::INIT, true);
+
+            if (wrk->IsRunning())
+            {
+                if (!it->m_iTimer)
+                    wrk->DoControl();
+            }
+            else continue;
+
+            if (wrk->GetState() == workstate::WAIT)
+            {
+                WaitObject& obj = wrk->GetWait();
+                if (!it->m_iTimer)
+                {
+                    switch(obj.m_Type)
+                    {
+                    case WaitObject::NoWait:
+                        wrk->SetState(workstate::RUNNING, true);
+                        break;
+                    case WaitObject::WaitInterval:
+                        it->m_iTimer = (int)obj.m_lInterval;
+                        break;
+                    case WaitObject::WaitFunction:
+                        printf("WaitFunction\n");
+                        if (obj.m_Func(obj.m_pData))
+                        {
+                            printf("OK WaitFunction\n");
+                            wrk->SetState(workstate::RUNNING, true);
+                            it->m_iTimer = 0;
+                        }
+                        else it->m_iTimer = (int)obj.m_lInterval;
+                        break;
+                    }
+                }
+                else
+                {
+                    it->m_iTimer -= SCHEDULER_DELAY;
+                    if (it->m_iTimer <= 0)
+                    {
+                        if (obj.m_Type != WaitObject::WaitFunction)
+                            wrk->SetState(workstate::RUNNING, true);
+                        it->m_iTimer = 0;
+                    }
+                }
+            }
+
+            if (wrk->IsRunning() && wrk->GetState() != workstate::WAIT)
+                wrk->DoWork();
+        } catch (const std::exception& exc) {
+            wrk->OnException(exc);
+        }
+    }
+
+    for (auto it = m_Workers.begin(); it != m_Workers.end();)
+    {
+        Worker* wrk = it->m_pWorker;
+        if (!wrk->IsRunning())
+        {
+            WorkerDestroy(wrk);
+            m_Workers.erase(it);
+        }
+        else ++it;
+    }
+
+    if (GetStage() == 0)
+    {
+        while(m_Workers.size() < m_uMaxWorkers)
+        {
+            Worker* wrk = m_Create(GetData());
+            if (wrk)
+                WorkerStart(wrk);
+            else
+            {
+                Continue(1);
+                break;
+            }
+        }
+    }
+    else if (GetStage() == 1 && m_Workers.empty())
+        Finish();
+}
+
+void Scheduler::WorkerStart(Worker* wrk)
+{
+    printf("WorkerStart %p\n", wrk);
+    wrk->EnableThink(false);
+
+    schedworker_t sched = { wrk, 0 };
+    m_Workers.push_back(sched);
+}
+
+void Scheduler::WorkerUpdate(Worker* wrk)
+{
+    printf("WorkerUpdate %p\n", wrk);
+    wrk->Update();
+
+}
+
+void Scheduler::WorkerDestroy(Worker* wrk)
+{
+    printf("WorkerDestroy %p %s\n", wrk, wrk->GetExitMessage().c_str());
+    delete wrk;
+}
diff --git a/scheduler.h b/scheduler.h
new file mode 100644
index 0000000..18c3ec8
--- /dev/null
+++ b/scheduler.h
@@ -0,0 +1,36 @@
+#ifndef __SCHEDULER_H
+#define __SCHEDULER_H
+
+#include <Windows.h>
+#include <functional>
+#include <vector>
+#include "worker.h"
+
+#define SCHEDULER_DELAY 100
+
+typedef struct {
+    Worker* m_pWorker;
+    int m_iTimer;
+} schedworker_t;
+
+typedef std::function<Worker*(void*)> CreateFunc;
+
+class Scheduler : public ThreadWorker
+{
+public:
+    Scheduler(CreateFunc func, unsigned uMaxWorkers);
+    ~Scheduler();
+
+    void DoControl() override;
+    void DoWork() override;
+protected:
+    void WorkerStart(Worker* wrk);
+    void WorkerUpdate(Worker* wrk);
+    void WorkerDestroy(Worker* wrk);
+private:
+    CreateFunc m_Create;
+    unsigned m_uMaxWorkers;
+    std::vector<schedworker_t> m_Workers;
+};
+
+#endif
diff --git a/worker.cpp b/worker.cpp
new file mode 100644
index 0000000..219faad
--- /dev/null
+++ b/worker.cpp
@@ -0,0 +1,272 @@
+#include "worker.h"
+
+/* WaitObject */
+
+WaitObject::WaitObject()
+    : m_Type(WaitObject::NoWait)
+{
+    m_lInterval = 0;
+    m_Func = NULL;
+    m_pData = NULL;
+}
+
+WaitObject::WaitObject(long lInterval)
+    : m_Type(WaitObject::WaitInterval)
+{
+    m_lInterval = lInterval > 0 ? lInterval : 0;
+    m_Func = NULL;
+    m_pData = NULL;
+}
+
+WaitObject::WaitObject(WaitFunc func, void* data, long delay)
+    : m_Type(WaitObject::WaitFunction)
+{
+    m_lInterval = delay > 0 ? delay : 0;
+    m_Func = func;
+    m_pData = data;
+}
+
+const WaitObject NoWait = WaitObject();
+const WaitObject DefWait = WaitObject(100);
+
+/* Worker */
+
+Worker::Worker()
+{
+    m_pData = NULL;
+    m_bThink = false;
+    m_iStage = 0;
+    m_State = workstate::INIT;
+    m_bRunning = false;
+}
+
+Worker::~Worker()
+{
+}
+
+void Worker::SetName(const std::wstring& name)
+{
+    m_Name = name;
+}
+
+std::wstring Worker::GetName() const
+{
+    return m_Name;
+}
+
+void Worker::SetData(void* data)
+{
+    m_pData = data;
+}
+
+void* Worker::GetData() const
+{
+    return m_pData;
+}
+
+void Worker::SetControlFunction(WorkerFunc func)
+{
+    m_Control = func;
+}
+
+void Worker::SetWorkerFunction(WorkerFunc func)
+{
+    m_Work = func;
+}
+
+void Worker::SetUpdateFunction(WorkerFunc func)
+{
+    m_Update = func;
+}
+
+void Worker::SetState(workstate state, bool bRunning)
+{
+    if (m_State == workstate::WAIT && state != m_State)
+        m_Wait = NoWait;
+
+    m_State = state;
+    m_bRunning = bRunning;
+}
+
+workstate Worker::GetState() const
+{
+    return m_State;
+}
+
+bool Worker::IsRunning() const
+{
+    return m_bRunning;
+}
+
+std::string& Worker::GetExitMessage()
+{
+    return m_Msg;
+}
+
+WaitObject& Worker::GetWait()
+{
+    return m_Wait;
+}
+
+void Worker::SetStage(int stage)
+{
+    m_iStage = stage;
+}
+
+int Worker::GetStage() const
+{
+    return m_iStage;
+}
+
+int Worker::GetProgress() const
+{
+    return -1;
+}
+
+void Worker::EnableThink(bool bThink)
+{
+    m_bThink = bThink;
+}
+
+void Worker::Start()
+{
+    SetState(workstate::INIT, true);
+
+    Update();
+}
+
+void Worker::Fail(const std::string& msg)
+{
+    SetState(workstate::FAIL, false);
+    m_Msg = msg;
+}
+
+void Worker::Wait(const WaitObject& obj)
+{
+    SetState(workstate::WAIT, true);
+    m_Wait = obj;
+}
+
+void Worker::Continue(int nextStage)
+{
+    SetState(workstate::RUNNING, true);
+    if (nextStage != -1)
+        SetStage(nextStage);
+}
+
+void Worker::Finish()
+{
+    SetState(workstate::FINISH, false);
+}
+
+void Worker::OnException(const std::exception& exc)
+{
+    fprintf(stderr, "%s\n", exc.what());
+    Fail(exc.what());
+}
+
+void Worker::DoControl()
+{
+    if (m_Control)
+        m_Control(this);
+}
+
+void Worker::DoWork()
+{
+    if (m_Work)
+        m_Work(this);
+}
+
+void Worker::Update()
+{
+    try {
+        if (m_Update)
+            m_Update(this);
+
+        DoControl();
+        if (m_bThink)
+            Think();
+
+        if (IsRunning() && GetState() != workstate::WAIT)
+            DoWork();
+    } catch (const std::exception& exc) {
+        OnException(exc);
+    }
+}
+
+void Worker::Think()
+{
+    switch(GetState())
+    {
+    case workstate::WAIT: DoWait(); break;
+    default: return;
+    }
+}
+
+void Worker::DoWait()
+{
+    WaitObject& obj = GetWait();
+    switch(obj.m_Type)
+    {
+    case WaitObject::NoWait:
+        SetState(workstate::RUNNING, true);
+        break;
+    case WaitObject::WaitInterval:
+        Sleep(obj.m_lInterval);
+        SetState(workstate::RUNNING, true);
+        break;
+    case WaitObject::WaitFunction:
+        if (obj.m_Func(obj.m_pData))
+            SetState(workstate::RUNNING, true);
+        else Sleep(obj.m_lInterval);
+        break;
+    }
+}
+
+void Worker::Run()
+{
+    do {
+        Update();
+    } while (IsRunning());
+}
+
+/* ThreadWorker */
+
+ThreadWorker::ThreadWorker()
+{
+    m_hThread = INVALID_HANDLE_VALUE;
+    m_ulThreadId = 0;
+}
+
+ThreadWorker::~ThreadWorker()
+{
+}
+
+unsigned long ThreadWorker::GetThreadId() const
+{
+    return m_ulThreadId;
+}
+
+DWORD WINAPI ThreadWorker::_ThreadWorker(LPVOID lpArg)
+{
+    ThreadWorker* wrk = (ThreadWorker*)lpArg;
+
+    wrk->SetState(workstate::INIT, false);
+    wrk->EnableThink(true);
+    wrk->Update();
+
+    wrk->Run();
+    return !(wrk->GetState() == workstate::FINISH);
+}
+
+void ThreadWorker::Start()
+{
+    DWORD dwTid;
+    m_hThread = CreateThread(NULL, 0, _ThreadWorker, this, 0, &dwTid);
+    m_ulThreadId = dwTid;
+}
+
+void ThreadWorker::JoinThread()
+{
+    WaitForSingleObject(m_hThread, INFINITE);
+}
diff --git a/worker.h b/worker.h
new file mode 100644
index 0000000..28a5b9e
--- /dev/null
+++ b/worker.h
@@ -0,0 +1,146 @@
+#ifndef __WORKER_H
+#define __WORKER_H
+
+#include <Windows.h>
+#include <functional>
+#include <exception>
+#include <string>
+
+/* WaitObject */
+
+typedef std::function<bool(void*)> WaitFunc;
+
+class WaitObject
+{
+public:
+    enum : int { NoWait, WaitInterval, WaitFunction };
+
+    WaitObject();
+    WaitObject(long lInterval);
+    WaitObject(WaitFunc func, void* data, long delay);
+
+    int m_Type;
+    long m_lInterval;
+    WaitFunc m_Func;
+    void* m_pData;
+};
+
+extern const WaitObject NoWait;
+extern const WaitObject DefWait;
+
+/* Worker */
+
+class Worker;
+
+/*typedef enum class {
+    STATE_FAIL = -1,
+    STATE_INIT,
+    STATE_WAIT,
+    STATE_RUNNING,
+    STATE_FINISH,
+} workstate;*/
+/*enum class workstate {
+    STATE_FAIL = -1,
+    STATE_INIT,
+    STATE_WAIT,
+    STATE_RUNNING,
+    STATE_FINISH
+};*/
+
+enum class workstate {
+    FAIL = -1,
+    INIT,
+    WAIT,
+    RUNNING,
+    FINISH
+};
+
+typedef std::function<void(Worker*)> WorkerFunc;
+
+class Worker
+{
+public:
+    Worker();
+    virtual ~Worker();
+
+    virtual void SetName(const std::wstring& name);
+    virtual std::wstring GetName() const;
+
+    virtual void SetData(void* pData);
+    virtual void* GetData() const;
+
+    virtual void SetControlFunction(WorkerFunc func);
+    virtual void SetWorkerFunction(WorkerFunc func);
+    virtual void SetUpdateFunction(WorkerFunc func);
+
+    virtual void SetState(workstate state, bool bRunning);
+
+    virtual workstate GetState() const;
+    virtual bool IsRunning() const;
+
+    virtual std::string& GetExitMessage();
+    virtual WaitObject& GetWait();
+
+    virtual void SetStage(int stage);
+    virtual int GetStage() const;
+
+    virtual int GetProgress() const;
+
+    virtual void EnableThink(bool bThink);
+    virtual void Start();
+
+    virtual void Fail(const std::string& msg);
+    virtual void Wait(const WaitObject& obj);
+    virtual void Continue(int nextStage = -1);
+
+    virtual void Finish();
+
+    virtual void OnException(const std::exception& exc);
+
+    virtual void DoControl();
+    virtual void DoWork();
+protected:
+    virtual void Think();
+    void DoWait();
+public:
+    virtual void Update();
+    virtual void Run();
+private:
+    std::wstring m_Name;
+
+    void* m_pData;
+
+    WorkerFunc m_Control;
+    WorkerFunc m_Work;
+    WorkerFunc m_Update;
+
+    workstate m_State;
+    bool m_bRunning;
+    int m_iStage;
+    std::string m_Msg;
+
+    WaitObject m_Wait;
+
+    bool m_bThink;
+};
+
+/* ThreadWorker */
+
+class ThreadWorker : public Worker
+{
+public:
+    ThreadWorker();
+    virtual ~ThreadWorker();
+
+    virtual unsigned long GetThreadId() const;
+
+    virtual void Start();
+    void JoinThread();
+private:
+    static DWORD WINAPI _ThreadWorker(LPVOID);
+
+    unsigned long m_ulThreadId;
+    HANDLE m_hThread;
+};
+
+#endif