Refactor shared memory initialization

Src/Model/BioTrackerTrackingAlgorithm.cpp

@@ -18,24 +18,6 @@
 
 using json = nlohmann::json;
 
-void* init_shm_mmap(const char *path, int len) {
-    int fd = shm_open(path, O_RDWR, 0);
-    if (fd == -1) {
-        throw "shm_open";
-    }
-
-    void *shm_buf = mmap(NULL, len,
-            PROT_READ | PROT_WRITE,
-            MAP_SHARED, fd, 0);
-    close(fd);
-
-    if (shm_buf == MAP_FAILED) {
-        throw "mmap";
-    }
-
-    return shm_buf;
-}
-
 BioTrackerTrackingAlgorithm::BioTrackerTrackingAlgorithm(IController *parent, IModel* parameter, IModel* trajectory)
 : IModelTrackingAlgorithm(parent)
 {
@@ -55,7 +37,7 @@ BioTrackerTrackingAlgorithm::~BioTrackerTrackingAlgorithm()
     stop_python();
 }
 
-void BioTrackerTrackingAlgorithm::request_shared_memory() {
+void BioTrackerTrackingAlgorithm::init_shared_memory() {
     json j = {
         { "type", "request_shared_memory" },
         { "width", _imageX },
@@ -65,7 +47,23 @@ void BioTrackerTrackingAlgorithm::request_shared_memory() {
     auto res = _sock.recv(_zmq_msg, zmq::recv_flags::none);
     auto msg = json::parse(_zmq_msg.to_string_view());
     std::string shm_path = msg["path"].get<std::string>();
-    _shm_img = (float*)init_shm_mmap(shm_path.c_str(), _imageX * _imageY * sizeof(float));
+    int shm_len = _imageX * _imageY * sizeof(float);
+
+    int fd = shm_open(shm_path.c_str(), O_RDWR, 0);
+    if (fd == -1) {
+        throw "shm_open";
+    }
+
+    void *shm_buf = mmap(NULL, shm_len,
+            PROT_READ | PROT_WRITE,
+            MAP_SHARED, fd, 0);
+    close(fd);
+
+    if (shm_buf == MAP_FAILED) {
+        throw "mmap";
+    }
+
+    _shm_img = (float*)shm_buf;
 }
 
 void BioTrackerTrackingAlgorithm::stop_python() {
@@ -112,7 +110,7 @@ void BioTrackerTrackingAlgorithm::doTracking(std::shared_ptr<cv::Mat> p_image, u
 	if (_imageX != p_image->size().width || _imageY != p_image->size().height) {
 		_imageX = p_image->size().width;
 		_imageY = p_image->size().height;
-        request_shared_memory();
+        init_shared_memory();
 		Q_EMIT emitDimensionUpdate(_imageX, _imageY);
 	}
 

Src/Model/BioTrackerTrackingAlgorithm.h

@@ -38,7 +38,7 @@ public Q_SLOTS:
     void receiveParametersChanged();
 
 private:
-    void request_shared_memory();
+    void init_shared_memory();
     void start_python();
     void stop_python();