Handout

kernel/thread/thread.cc

@@ -0,0 +1,36 @@
+// vim: set noet ts=4 sw=4:
+
+#include "thread.h"
+
+#include "../debug/kernelpanic.h"
+#include "../interrupt/guard.h"
+#include "debug/output.h"
+
+// counter for ID
+static size_t idCounter = 1;
+
+void Thread::kickoff(uintptr_t param1, uintptr_t param2, uintptr_t param3) {
+	Thread *thread = reinterpret_cast<Thread *>(param1);
+	assert(thread != nullptr && "Kickoff got nullptr pointer to Thread");
+	(void)param2;  // will be used later
+	(void)param3;  // will be used later
+	// The core must have entered level 1/2 to cause a thread to be scheduled.
+	Guard::leave();
+
+	thread->action();
+}
+
+Thread::Thread() : queue_link(nullptr), id(idCounter++), kill_flag(false) {
+	void *tos = reinterpret_cast<void *>(reserved_stack_space + STACK_SIZE);
+	prepareContext(tos, context, kickoff, reinterpret_cast<uintptr_t>(this), 0,
+				   0);
+}
+
+void Thread::resume(Thread *next) {
+	assert(next != nullptr && "Pointer to next Thread must not be nullptr!");
+	context_switch(&next->context, &context);
+}
+
+void Thread::go() { context_launch(&context); }
+
+void Thread::action() { kernelpanic("Wrong entry / missing action in Thread"); }