Changeset 469 for trunk/kernel/mm/page.h

Timestamp:

Aug 20, 2018, 1:04:16 PM (6 years ago)

Author:

alain

Message:

1) Introduce the libsemaphore library.
2) Introduce a small libmath library, required by the "fft" application..
3) Introduce the multithreaded "fft" application.
4) Fix a bad synchronisation bug in the Copy-On-Write mechanism.

File:

• trunk/kernel/mm/page.h (modified) (2 diffs)

trunk/kernel/mm/page.h

@@ -56 +56 @@
  * This structure defines a physical page descriptor.
  * Size is 64 bytes for a 32 bits core...
+ * The spinlock is used to test/modify the forks counter.
  * TODO : the list of waiting threads seems to be unused [AG]
- $ TODO : the spinlock use has to be clarified [AG]
+ * TODO : the refcount use has to be clarified 
  ************************************************************************************/
 
@@ -70 +71 @@
         uint32_t          refcount;       /*! reference counter                    (4)  */
         uint32_t          forks;          /*! number of pending forks              (4)  */
-        spinlock_t        lock;           /*! To Be Defined [AG]                   (16) */
+        spinlock_t        lock;           /*! protect the forks field              (4)  */
 }
 page_t;