X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Fsynch.h;h=53a5ee488cf07c83f68a7b136bc6506136180ac9;hb=615bf3b3d2a8573ed6fb9ddc0055745e163ac999;hp=c8ac2f446508a793962d455e6d3551e1af56d125;hpb=f2f8875638593bd5365cfd6a5ba7c9578e52322f;p=pintos-anon

diff --git a/src/threads/synch.h b/src/threads/synch.h
index c8ac2f4..53a5ee4 100644
--- a/src/threads/synch.h
+++ b/src/threads/synch.h
@@ -1,5 +1,5 @@
-#ifndef HEADER_SYNCH_H
-#define HEADER_SYNCH_H 1
+#ifndef THREADS_SYNCH_H
+#define THREADS_SYNCH_H
 
 #include <list.h>
 #include <stdbool.h>
@@ -7,42 +7,44 @@
 /* A counting semaphore. */
 struct semaphore 
   {
-    char name[16];              /* Name (for debugging purposes only). */
     unsigned value;             /* Current value. */
     struct list waiters;        /* List of waiting threads. */
   };
 
-void sema_init (struct semaphore *, unsigned value, const char *);
+void sema_init (struct semaphore *, unsigned value);
 void sema_down (struct semaphore *);
+bool sema_try_down (struct semaphore *);
 void sema_up (struct semaphore *);
-const char *sema_name (const struct semaphore *);
 void sema_self_test (void);
 
 /* Lock. */
 struct lock 
   {
-    char name[16];              /* Name (for debugging purposes only). */
     struct thread *holder;      /* Thread holding lock (for debugging). */
     struct semaphore semaphore; /* Binary semaphore controlling access. */
   };
 
-void lock_init (struct lock *, const char *);
+void lock_init (struct lock *);
 void lock_acquire (struct lock *);
+bool lock_try_acquire (struct lock *);
 void lock_release (struct lock *);
 bool lock_held_by_current_thread (const struct lock *);
-const char *lock_name (const struct lock *);
 
 /* Condition variable. */
 struct condition 
   {
-    char name[16];              /* Name (for debugging purposes only). */
     struct list waiters;        /* List of waiting threads. */
   };
 
-void cond_init (struct condition *, const char *);
+void cond_init (struct condition *);
 void cond_wait (struct condition *, struct lock *);
 void cond_signal (struct condition *, struct lock *);
 void cond_broadcast (struct condition *, struct lock *);
-const char *cond_name (const struct condition *);
 
-#endif /* synch.h */
+/* Memory barrier.
+
+   The compiler will not reorder operations that access memory
+   across a memory barrier. */
+#define barrier() asm volatile ("")
+
+#endif /* threads/synch.h */