Much more precise timer functions

lib/rotor.hpp

@@ -38,9 +38,10 @@ namespace {
 class timer_core {
     public:
     mutex hangon;
+    condition_variable cv;
     function<void()> callback;
-    int64_t init;
     int64_t time;
+    int64_t next;
     bool repeat;
     bool stop;
 
@@ -48,15 +49,17 @@ class timer_core {
      * Timer constructor, receives a callback function and time
     */
     timer_core( function<void()> _callback, int64_t _time, bool _repeat):
-        callback(_callback), init(rtime_us()), time(_time*1000), repeat(_repeat), stop(false) {
+        callback(_callback), time(_time*1000), repeat(_repeat), stop(false) {
+            next = rtime_us() + time;
     }
 
     /**
      * Stop timer
     */
     void clear() {
-        lock_guard<mutex> hang(hangon);
+        // lock_guard<mutex> hang(hangon);
         stop = true;
+        cv.notify_one();
     }
 
     /**
@@ -77,65 +80,58 @@ class rotor {
     bool rotating = true;
     int64_t sampling;
 
+    condition_variable te_cv;
+
     /**
      * Loop method, started by the constructor in a separate runner
      * It checks the events on the stack and sends the expired ones to the runner
     */
     void loop() {
         while (rotating) {
-            for (int i=0; i<tcores.size(); i++) {
+            vector<shared_ptr<timer_core>>::iterator next_tc;
+            shared_ptr<timer_core> next_ptr;
+
+            {
+            unique_lock<mutex> te_l(te_m);
+            te_cv.wait(te_l, [this]{ return !tcores.empty(); });
+            // calc_next();
 
-                if (tcores[i]->stop) {
+            next_tc = min_element( tcores.begin(), tcores.end(),
-                    remove(i);
+                [](shared_ptr<timer_core> a, shared_ptr<timer_core> b ) {
-                    i--;
+                    return a->next < b->next;
                 }
+            );
 
-                else if (expired(tcores[i])) {
+            next_ptr = *next_tc;
-                    _asyncon.put_task(tcores[i]->callback);
+            }
-                    if (tcores[i]->repeat) {
+
-                        tcores[i]->init = rtime_us();
+            unique_lock<mutex> next_l(next_ptr->hangon);
-                    }
+            next_ptr->cv.wait_for(next_l, chrono::microseconds(next_ptr->next - rtime_us()),  [&next_ptr] () {
-                    else {
+                return next_ptr->stop;
-                        remove(i);
+            });
-                        i--;
+
-                    }
+            if (next_ptr->stop) {
+                remove(next_tc);
+            } else {
+                _asyncon.put_task(next_ptr->callback);
+                if (next_ptr->repeat) {
+                    next_ptr->next += next_ptr->time;
+                }
+                else {
+                    remove(next_tc);
                 }
             }
-            this_thread::sleep_for(chrono::microseconds(sampling));
-        } 
-    }
 
-    /**
+        } 
-     * The method checks whether the time event has expired
-    */
-    bool expired(shared_ptr<timer_core> tcore) {
-        return rtime_us() - tcore->init >= tcore->time;
     }
-
+    
     /**
      * The method deletes a non-repeating or stopped event from the stack
     */
-    void remove(const int& position) {
+    void remove(vector<shared_ptr<timer_core>>::iterator it) {
         lock_guard<mutex> lock(te_m);
-        tcores.erase(tcores.begin()+position);
+        tcores.erase(it);
-        update_sampling();
+        te_cv.notify_one();
-    }
-
-    /**
-     * Updates the idle time of the loop, according to twice the frequency of available events
-    */
-    void update_sampling() {
-        if (tcores.empty()) {
-            sampling = 100;
-            return;
-        }
-        sampling = tcores[0]->time;
-        for (int i=0; i<tcores.size(); i++) {
-            if (sampling > tcores[i]->time) {
-                sampling = tcores[i]->time;
-            }
-        }
-        sampling /= tcores.size()*2;
     }
 
     public:
@@ -155,7 +151,7 @@ class rotor {
     void insert(shared_ptr<timer_core> tcore) {
         lock_guard<mutex> lock(te_m);
         tcores.push_back(tcore);
-        update_sampling();
+        te_cv.notify_one();
     };
 
     /**

test/test.cpp

@@ -61,11 +61,11 @@ int main () {
 
     auto start = rtime_ms();
 
-    // // --------------- TIME ASYNCHRONOUS FUNCTIONS --------------
+    // --------------- TIME ASYNCHRONOUS FUNCTIONS --------------
 
-    // /**
+    /**
-    //  * Init interval and timeout; clear interval and timeout
+     * Init interval and timeout; clear interval and timeout
-    // */
+    */
 
     // interval( [&] () {
     //     cout << "interval 1: "  << rtime_ms() - start << endl;
@@ -88,17 +88,17 @@ int main () {
     //     cout << "interval 4: "  << rtime_ms() - start << endl;
     // }, 400);
 
-    // interval inter1 ([&]() {
+    interval inter1 ([&]() {
-    //     cout << "interval prvi " << rtime_ms() - start << endl;
+        cout << "interval prvi " << rtime_ms() - start << endl;
-    // }, 1000);
+    }, 1000);
 
-    // interval inter2 ([&]() {
+    interval inter2 ([&]() {
-    //     cout << "interval drugi " << rtime_ms() - start << endl;
+        cout << "interval drugi " << rtime_ms() - start << endl;
-    // }, 2000);
+    }, 2000);
 
-    // interval inter3 ([&]() {
+    interval inter3 ([&]() {
-    //     cout << "interval treći " << rtime_ms() - start << endl;
+        cout << "interval treći " << rtime_ms() - start << endl;
-    // }, 3000);
+    }, 3000);
 
     // interval inter4 ([&]() {
     //     cout << "interval cetvrti " << rtime_ms() - start << endl;
@@ -114,17 +114,18 @@ int main () {
 
     // timeout time1 ( [&] () {
     //     cout << "Close interval 1 i 2 " << rtime_ms() - start << endl;
-    //     // inter1.clear();
+    //     inter1.clear();
     //     // cout << "inter1.stop " << inter1.stop << endl;
-    //     // inter2.clear();
+    //     inter2.clear();
     //     // cout << "inter2.stop " << inter2.stop << endl;
 
     // }, 5000);
 
+
     // timeout time2 ([&] () {
     //     cout << "Close interval 3 " << rtime_ms() - start << endl;
     //     // inter3.clear();
-    //     // time1.clear();
+    //     time1.clear();
     // }, 2000);
 
     // // ------------------------ MAKE FUNCTIONS ASYNCHRONOUS -------------------------
@@ -218,68 +219,68 @@ int main () {
     //     });
     // });
 
-    // --------------- EVENTS -------------------
+    // // --------------- EVENTS -------------------
 
-    /**
+    // /**
-     * initialization of typed events
+    //  * initialization of typed events
-    */
+    // */
 
-    event<int, int> ev2int;
+    // event<int, int> ev2int;
-    event<int, string> evintString;
+    // event<int, string> evintString;
-    event<> evoid;
+    // event<> evoid;
 
-    ev2int.on("sum", [](int a, int b) {
+    // ev2int.on("sum", [](int a, int b) {
-        cout << "Sum " << a+b << endl;
+    //     cout << "Sum " << a+b << endl;
-    });
+    // });
 
-    ev2int.on("sum", [](int a, int b) {
+    // ev2int.on("sum", [](int a, int b) {
-        cout << "Sum done" << endl;
+    //     cout << "Sum done" << endl;
-    });
+    // });
 
-    evintString.on("substract", [](int a, string b) {
+    // evintString.on("substract", [](int a, string b) {
-        cout << "Substract " << a-stoi(b) << endl;
+    //     cout << "Substract " << a-stoi(b) << endl;
-    });
+    // });
 
-    evoid.on("void", []() {
+    // evoid.on("void", []() {
-        cout << "Void emited" << endl;
+    //     cout << "Void emited" << endl;
-    });
+    // });
 
-    string emited2 = "2";
+    // string emited2 = "2";
 
-    evoid.on("void", [&]() {
+    // evoid.on("void", [&]() {
-        cout << "Void emited " << emited2 << endl;
+    //     cout << "Void emited " << emited2 << endl;
-    });
+    // });
 
-    evoid.emit("void");
+    // evoid.emit("void");
-    sleep(1);
+    // sleep(1);
 
-    /**
+    // /**
-     * Emit
+    //  * Emit
-    */
+    // */
 
-    ev2int.emit("sum", 5, 8);
+    // ev2int.emit("sum", 5, 8);
     
 
-    sleep(1);
+    // sleep(1);
-    evintString.emit("substract", 3, to_string(2));
+    // evintString.emit("substract", 3, to_string(2));
 
-    sleep(1);
+    // sleep(1);
-    evoid.off("void");
+    // evoid.off("void");
-    evoid.emit("void");
+    // evoid.emit("void");
 
-    /**
+    // /**
-     * Own class 
+    //  * Own class 
-    */
+    // */
 
-    myOwnClass myclass;
+    // myOwnClass myclass;
 
-    timeout t( [&] {
+    // timeout t( [&] {
-        myclass.emit("constructed", 1);
+    //     myclass.emit("constructed", 1);
-    }, 200);
+    // }, 200);
 
-    myclass.on("constructed", [] (int i) {
+    // myclass.on("constructed", [] (int i) {
-        cout << "Constructed " << i  << endl;
+    //     cout << "Constructed " << i  << endl;
-    });
+    // });