Break GDT, TSS out of init.c, mmu.h.

[pintos-anon] / src / threads / synch.c

diff --git a/src/threads/synch.c b/src/threads/synch.c
index 61446a18fd48a1489a4a8d6ee154febc5ef605d9..ea38068ad017f58888cdf34c9d9f5ce652d4449e 100644 (file)
--- a/src/threads/synch.c
+++ b/src/threads/synch.c
@@ -1,7 +1,6 @@
 #include "synch.h"
 #include "interrupt.h"
 #include "lib.h"
-#include "malloc.h"
 #include "thread.h"
 
 /* One thread in a list. */
@@ -35,11 +34,13 @@ sema_init (struct semaphore *sema, unsigned value, const char *name)
    atomically decrements it.
 
    This function may sleep, so it must not be called within an
-   interrupt handler. */
+   interrupt handler.  This function may be called with
+   interrupts disabled, but interrupts will be turned back on if
+   we need to sleep. */
 void
 sema_down (struct semaphore *sema) 
 {
-  enum if_level old_level;
+  enum intr_level old_level;
 
   ASSERT (sema != NULL);
   ASSERT (!intr_context ());
@@ -63,14 +64,14 @@ sema_down (struct semaphore *sema)
 void
 sema_up (struct semaphore *sema) 
 {
-  enum if_level old_level;
+  enum intr_level old_level;
 
   ASSERT (sema != NULL);
 
   old_level = intr_disable ();
   if (!list_empty (&sema->waiters)) 
-    thread_ready (list_entry (list_pop_front (&sema->waiters),
-                              struct thread_elem, elem)->thread);
+    thread_wake (list_entry (list_pop_front (&sema->waiters),
+                             struct thread_elem, elem)->thread);
   sema->value++;
   intr_set_level (old_level);
 }
@@ -117,9 +118,9 @@ sema_self_test (void)
 \f
 /* Initializes LOCK and names it NAME (for debugging purposes).
    A lock can be held by at most a single thread at any given
-   time.  Our locks are not "recursive", meaning that it is an
-   error for a thread that holds a lock to attempt to reacquire
-   it.
+   time.  Our locks are not "recursive", that is, it is an error
+   for the thread currently holding a lock to try to acquire that
+   lock.
 
    A lock is a specialization of a semaphore with an initial
    value of 1.  The difference between a lock and such a
@@ -147,11 +148,13 @@ lock_init (struct lock *lock, const char *name)
    thread.
 
    This function may sleep, so it must not be called within an
-   interrupt handler. */
+   interrupt handler.  This function may be called with
+   interrupts disabled, but interrupts will be turned back on if
+   we need to sleep. */
 void
 lock_acquire (struct lock *lock)
 {
-  enum if_level old_level;
+  enum intr_level old_level;
 
   ASSERT (lock != NULL);
   ASSERT (!intr_context ());
@@ -171,7 +174,7 @@ lock_acquire (struct lock *lock)
 void
 lock_release (struct lock *lock) 
 {
-  enum if_level old_level;
+  enum intr_level old_level;
 
   ASSERT (lock != NULL);
   ASSERT (lock_held_by_current_thread (lock));
@@ -240,7 +243,9 @@ cond_init (struct condition *cond, const char *name)
    from locks to condition variables.
 
    This function may sleep, so it must not be called within an
-   interrupt handler. */
+   interrupt handler.  This function may be called with
+   interrupts disabled, but interrupts will be turned back on if
+   we need to sleep. */
 void
 cond_wait (struct condition *cond, struct lock *lock) 
 {