X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?p=pintos-anon;a=blobdiff_plain;f=src%2Fthreads%2Fthread.c;h=2532463bdbbf5d8f2544cba0b590ae070d2d07e1;hp=92d1aa899efe1d8bf84c6c7056ae7d45215c687b;hb=3edcfedb8e62970f3293fa676b6691f8658c3c11;hpb=ef87ec47544e7a120d19211b6332d41b11403992

diff --git a/src/threads/thread.c b/src/threads/thread.c
index 92d1aa8..2532463 100644
--- a/src/threads/thread.c
+++ b/src/threads/thread.c
@@ -24,6 +24,10 @@
    that are ready to run but not actually running. */
 static struct list ready_list;
 
+/* List of all processes.  Processes are added to this list
+   when they are first scheduled and removed when they exit. */
+static struct list all_list;
+
 /* Idle thread. */
 static struct thread *idle_thread;
 
@@ -87,6 +91,7 @@ thread_init (void)
 
   lock_init (&tid_lock);
   list_init (&ready_list);
+  list_init (&all_list);
 
   /* Set up a thread structure for the running thread. */
   initial_thread = running_thread ();
@@ -166,6 +171,7 @@ thread_create (const char *name, int priority,
   struct switch_entry_frame *ef;
   struct switch_threads_frame *sf;
   tid_t tid;
+  enum intr_level old_level;
 
   ASSERT (function != NULL);
 
@@ -178,6 +184,11 @@ thread_create (const char *name, int priority,
   init_thread (t, name, priority);
   tid = t->tid = allocate_tid ();
 
+  /* Prepare thread for first run by initializing its stack.
+     Do this atomically so intermediate values for the 'stack' 
+     member cannot be observed. */
+  old_level = intr_disable ();
+
   /* Stack frame for kernel_thread(). */
   kf = alloc_frame (t, sizeof *kf);
   kf->eip = NULL;
@@ -191,6 +202,9 @@ thread_create (const char *name, int priority,
   /* Stack frame for switch_threads(). */
   sf = alloc_frame (t, sizeof *sf);
   sf->eip = switch_entry;
+  sf->ebp = 0;
+
+  intr_set_level (old_level);
 
   /* Add to run queue. */
   thread_unblock (t);
@@ -280,9 +294,11 @@ thread_exit (void)
   process_exit ();
 #endif
 
-  /* Just set our status to dying and schedule another process.
-     We will be destroyed during the call to schedule_tail(). */
+  /* Remove thread from all threads list, set our status to dying,
+     and schedule another process.  That process will destroy us
+     when it call schedule_tail(). */
   intr_disable ();
+  list_remove (&thread_current()->allelem);
   thread_current ()->status = THREAD_DYING;
   schedule ();
   NOT_REACHED ();
@@ -306,6 +322,23 @@ thread_yield (void)
   intr_set_level (old_level);
 }
 
+/* Invoke function 'func' on all threads, passing along 'aux'.
+   This function must be called with interrupts off. */
+void
+thread_foreach (thread_action_func *func, void *aux)
+{
+  struct list_elem *e;
+
+  ASSERT (intr_get_level () == INTR_OFF);
+
+  for (e = list_begin (&all_list); e != list_end (&all_list);
+       e = list_next (e))
+    {
+      struct thread *t = list_entry (e, struct thread, allelem);
+      func (t, aux);
+    }
+}
+
 /* Sets the current thread's priority to NEW_PRIORITY. */
 void
 thread_set_priority (int new_priority) 
@@ -436,6 +469,7 @@ init_thread (struct thread *t, const char *name, int priority)
   t->stack = (uint8_t *) t + PGSIZE;
   t->priority = priority;
   t->magic = THREAD_MAGIC;
+  list_push_back (&all_list, &t->allelem);
 }
 
 /* Allocates a SIZE-byte frame at the top of thread T's stack and