Handout

kernel/user/app2/kappl.cc

@@ -0,0 +1,48 @@
+// vim: set noet ts=4 sw=4:
+
+#include "./kappl.h"
+
+#include "../../device/textstream.h"
+extern TextStream kout;
+#include "../../interrupt/guard.h"
+extern Semaphore koutsem;
+
+void KeyboardApplication::action() {  // NOLINT
+	const unsigned line = 10 + 2;
+	for (unsigned column = 0;; ++column) {
+		Key key;
+		{
+			Guarded g = Guard::enter();
+			g.vault().keys_sem.p(g.vault());
+			assert(g.vault().keys.consume(key) && "No key but sem returned!");
+		}
+		if (key.valid()) {
+			if (column >= CGA::COLUMNS - 1) {
+				column = 0;
+				koutsem.p(Guard::enter().vault());
+				for (unsigned offset = 0; offset < 3; offset++) {
+					for (unsigned column = 0; column < CGA::COLUMNS; ++column) {
+						CGA::show(column, line + offset, ' ');
+					}
+				}
+				koutsem.v(Guard::enter().vault());
+			}
+			koutsem.p(Guard::enter().vault());
+			kout.setPos(column, line);
+			kout << static_cast<char>(key.ascii());
+			kout.flush();
+			koutsem.v(Guard::enter().vault());
+		}
+		for (unsigned offset = 0; offset < 3; offset++) {
+			{
+				Guarded g = Guard::enter();
+				g.vault().bellringer.sleep(g.vault(), 10);
+				koutsem.p(g.vault());
+			}
+			kout.setPos(column, line + offset);
+			kout << static_cast<char>(key.ascii());
+			kout.flush();
+			koutsem.v(Guard::enter().vault());
+		}
+	}
+}