Add some documentation

proctl/proctl_linux_amd64.go

@@ -198,6 +198,8 @@ func (dbp *DebuggedProcess) Status() *syscall.WaitStatus {
 	return dbp.CurrentThread.Status
 }
 
+// Loop through all threads, printing their information
+// to the console.
 func (dbp *DebuggedProcess) PrintThreadInfo() error {
 	for _, th := range dbp.Threads {
 		if err := th.PrintInfo(); err != nil {

proctl/threads_linux_amd64.go

@@ -48,6 +48,8 @@ func (thread *ThreadContext) CurrentPC() (uint64, error) {
 	return regs.PC(), nil
 }
 
+// PrintInfo prints out the thread status
+// including: PC, tid, file, line, and function.
 func (thread *ThreadContext) PrintInfo() error {
 	pc, err := thread.CurrentPC()
 	if err != nil {