01 ws ipc
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@ -54,6 +54,7 @@ It is recommended to have a basic understanding of C++ basics and object-oriente
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in general before doing this workshop. There are various books and online resources available to
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in general before doing this workshop. There are various books and online resources available to
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learn this.
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learn this.
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All tasks are done in the `main.cpp` of this project and are located in subfolders.
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In general, it is recommended to start with the `ws-tasks` workshop and then move to the
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In general, it is recommended to start with the `ws-tasks` workshop and then move to the
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`ws-objects` workshop.
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`ws-objects` workshop.
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36
ws-ipc/ipc-solutions/main-01.cpp
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36
ws-ipc/ipc-solutions/main-01.cpp
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#include <iostream>
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#include <thread>
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#include <mutex>
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using namespace std;
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std::mutex SHARED_LOCK;
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static uint32_t SHARED_COUNTER = 0;
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void task0() {
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using namespace std::chrono_literals;
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while (true) {
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SHARED_LOCK.lock();
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cout << "Task0: Shared counter after increment" << ++SHARED_COUNTER << endl;
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SHARED_LOCK.unlock();
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this_thread::sleep_for(1000ms);
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}
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}
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void task1() {
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using namespace std::chrono_literals;
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while(true) {
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{
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std::lock_guard lg(SHARED_LOCK);
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cout << "Task1: Shared counter after increment" << ++SHARED_COUNTER << endl;
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}
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this_thread::sleep_for(1000ms);
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}
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}
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int main() {
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std::thread t0(task0);
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std::thread t1(task1);
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t0.join();
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t1.join();
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}
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@ -1,5 +1,9 @@
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# Threads and Tasks
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# Threads and Tasks
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This workshop is split into 4 subtasks which are done in the `main.cpp` of this
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project.
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## Background Information
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A satellite is a complex system which usually has a lot of tasks which need to be done
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A satellite is a complex system which usually has a lot of tasks which need to be done
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simulatenously by a dedicated On-Board Computer (OBC). This can include for example:
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simulatenously by a dedicated On-Board Computer (OBC). This can include for example:
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@ -36,10 +40,12 @@ string every second: "Hello World".
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## 2. Changing to the concept of executable objects
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## 2. Changing to the concept of executable objects
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The goal of this task is to convert the code from task 1 so the `std::thread` API takes an
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The goal of this task is to convert the code from task 1 so the `std::thread` API takes an
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executable object to move to a more object oriented task approach. The printout of the thread
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executable object by reference to move to a more object oriented task approach.
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should remain the same. The executable objects should be named `MyExecutableObject`. It contains
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one function called `periodicOperation` which performs the printout, and a static function which
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The printout of the thread should remain the same. The executable objects should be named
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takes the `MyExecutableObject` itself by reference and executes it in a permanent loop.
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`MyExecutableObject`. It contains one function called `periodicOperation` which performs the
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printout, and a static function which takes the `MyExecutableObject` itself by reference and
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executes it in a permanent loop.
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The executable object should be passed into the `std::thread` directly.
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The executable object should be passed into the `std::thread` directly.
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@ -59,7 +65,10 @@ The executable object should be passed into the `std::thread` directly.
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4. Implement `executeTask`. This function uses the passed object and performs the scheduling
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4. Implement `executeTask`. This function uses the passed object and performs the scheduling
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specific part by calling `self.performOperation` in a permanent loop with a delay between
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specific part by calling `self.performOperation` in a permanent loop with a delay between
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calls. You can hardcode the delay to 1000ms for the first implementation.
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calls. You can hardcode the delay to 1000ms for the first implementation.
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5. Add a constructor to `MyExecutableObject` which expects a millisecond delay
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5. Change your `std::thread` calls in the main. You can pass the new `executeTask` function
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as the executable unit. The second argument should be an instance of the executable object
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itself. You might need the `std::reference_wrapper` to pass it as a reference.
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6. Add a constructor to `MyExecutableObject` which expects a millisecond delay
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as an `uint32_t` and cache it as a member variable. Then use this member
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as an `uint32_t` and cache it as a member variable. Then use this member
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variable in the `executeTask` implementation to make the task frequency configurable via the
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variable in the `executeTask` implementation to make the task frequency configurable via the
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constructor (ctor) parameter.
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constructor (ctor) parameter.
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