added doc on thread & executor

1 files changed, 41 insertions, 8 deletions

diff --git a/lib/thread.h b/lib/thread.h
index c181425..3dfa457 100644
--- a/lib/thread.h
+++ b/lib/thread.h
@@ -8,23 +8,42 @@
 namespace nMatcha {
     struct Executor;
 
+    // An abstract base class for implementing cooperative user threads.
+    //
+    // # Usage
+    //
+    // To implement a cooperative user thread following interface invoked by
+    // the Executor must be implemented:
+    //     virtual void threadFn() = 0;
+    // By calling `yield()` a thread can give control back to the executor.
+    //
+    // # Example
+    //
+    // ```cpp
+    // class MyThread : public nMatcha::Thread {
+    //     virtual void threadFn() override {
+    //         puts("Hello");
+    //         yield();
+    //         puts("World");
+    //     }
+    // };
+    // ```
+    //
     struct Thread {
         Thread(const Thread&) = delete;
         Thread& operator=(const Thread&) = delete;
         Thread();
         virtual ~Thread() {}
 
-        virtual void threadFn() = 0;
-
-        bool isFinished() const {
-            return mFinished;
-        }
+        bool isFinished() const;
 
       protected:
         void yield();
 
       private:
-        static void entry(void* obj);
+        virtual void threadFn() = 0;
+
+        static void entry(void* ctx);
         void* mStackPtr;
         bool mFinished;
 
@@ -32,20 +51,34 @@ namespace nMatcha {
         const Executor* mExecutor;
     };
 
+    // Helper interface to implement yielding for function objects.
     struct Yielder {
         virtual void yield() = 0;
     };
 
+    // Utility class to create cooperative user threads from function objects.
+    //
+    // # Example
+    //
+    // ```cpp
+    // auto t = nMatcha::FnThread::make([](nMatcha::Yielder& y) {
+    //     puts("Hello");
+    //     y.yield();
+    //     puts("World");
+    // });
+    // ```
+    //
     struct FnThread : public Thread, public Yielder {
         using UserFn = std::function<void(Yielder&)>;
+
+        // Factory method to create `FnThread` objects.
         static std::unique_ptr<Thread> make(UserFn f);
 
       private:
+        UserFn mUserFn;
         virtual void threadFn() override;
         virtual void yield() override;
 
-        UserFn mUserFn;
-
         enum class CreatorToken {};
 
       public: