Creates simple version of parallelstacks without the python script.

tests/helloparallelstacks/helloparallelstacks.cpp

@@ -0,0 +1,81 @@
+/*
+
+stack 1: main() -> readFiles()
+stack 2: threadReader() -> readFile() -> openFile()
+stack 3: threadReader() -> readFile() -> closeFile()
+stack 4: threadReader() -> readFile() -> readLine() -> read()
+stack 5: threadReader() -> readFile() -> readLine() -> seek()
+
+*/
+
+
+#include <print>
+#include <vector>
+#include <string>
+#include <thread>
+#include <chrono>
+
+void openFile(const std::string& filename)
+{
+    if (filename == "file1.dat") {
+        std::this_thread::sleep_for(std::chrono::seconds{60});
+    }
+}
+
+void closeFile(const std::string& filename)
+{
+    if (filename == "file2.dat") {
+        std::this_thread::sleep_for(std::chrono::seconds{60});
+    }
+}
+
+void read(const std::string& filename)
+{
+    if (filename == "file3.dat") {
+        std::this_thread::sleep_for(std::chrono::seconds{60});
+    }
+}
+
+void seek(const std::string& filename)
+{
+    if (filename == "file4.dat") {
+        std::this_thread::sleep_for(std::chrono::seconds{60});
+    }
+}
+
+void readLine(const std::string& filename)
+{
+    seek(filename);
+    read(filename);
+}
+
+void readFile(const std::string& filename)
+{
+    openFile(filename);
+    readLine(filename);
+    closeFile(filename);
+}
+
+void threadReader(const std::string& filename)
+{
+    readFile(filename);
+}
+
+void readFiles(const std::vector<std::string> & filenames)
+{
+    std::vector<std::thread> readers;
+
+    for (const auto& filename: filenames) {
+        readers.emplace_back(threadReader, filename);
+    }
+
+    for (auto& reader: readers) {
+        reader.join();
+    }
+}
+
+int main()
+{
+    auto filenames = std::vector<std::string>{"file1.dat", "file2.dat", "file3.dat", "file4.dat"};
+    readFiles(filenames);
+}