push child to parents list of children

1 files changed, 19 insertions, 5 deletions

diff --git a/src/userprog/process.c b/src/userprog/process.c
index 5897c84..5f7448b 100644
--- a/src/userprog/process.c
+++ b/src/userprog/process.c
@@ -28,6 +28,7 @@ struct start_process_args
 
     // child -> parent
     bool success;
+    struct list_elem *child_elem;  // list_elem to insert into list of children
   };
 
 static thread_func start_process NO_RETURN;
@@ -41,9 +42,11 @@ tid_t
 process_execute (const char *file_name) 
 {
   struct start_process_args args;  // stack allocated since we know we wait for thread_create to finish reading
+  struct thread *t;
   tid_t tid;
 
-  printf("%s starting %s\n", thread_current ()->name, file_name);
+  t = thread_current ();
+  printf("%s starting %s\n", t->name, file_name);
 
   sema_init (&args.sema, 0);
 
@@ -64,9 +67,11 @@ process_execute (const char *file_name)
   if (tid != TID_ERROR) {
     sema_down (&args.sema);
 
-    //TODO push to list of children
-    if (!args.success)
+    if (args.success) {
+      list_push_back (&t->children, args.child_elem);
+    } else {
       tid = -1;
+    }
   }
   palloc_free_page (args.file_name);
   return tid;
@@ -79,17 +84,26 @@ start_process (void *args_)
 {
   struct start_process_args *args = args_;
   struct intr_frame if_;
+  struct thread *t;
   bool success;
 
+  t = thread_current ();
+
   /* Initialize interrupt frame and load executable. */
   memset (&if_, 0, sizeof if_);
   if_.gs = if_.fs = if_.es = if_.ds = if_.ss = SEL_UDSEG;
   if_.cs = SEL_UCSEG;
   if_.eflags = FLAG_IF | FLAG_MBS;
-  printf("reading\n");
   success = load (args->file_name, &if_.eip, &if_.esp);
-
   args->success = success;
+
+  if (success) {
+    sema_init (&t->parent.exit_sema, 0);
+    lock_init (&t->parent.l);
+
+    args->child_elem = &t->parent.elem;
+  }
+
   sema_up (&args->sema);
 
   /* If load failed, quit. */