initial workings of shared memory

+ Should document this better but essentially a server requests a shared
  buffer, and chan then share this buffer to a thread. Freeing the
  buffer is done through normal means. MR_SHARED is used for buffers
  that are shared, and MR_OWNED tells whoever is freeing that region
  that it is allowed to free the physical memory behind the shared
  buffer.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/apos/mem.h b/include/apos/mem.h
index ece8ee3..bc60f21 100644
--- a/include/apos/mem.h
+++ b/include/apos/mem.h
@@ -39,6 +39,13 @@
                                            __page((x) + BASE_PAGE_SIZE))
 #define __bytes(x) (__addr(x))
 
+/* if memory region is used or not */
+#define MR_USED    (1 << 8)
+/* if memory region is shared */
+#define MR_SHARED  (1 << 9)
+/* owner of shared region */
+#define MR_OWNED   (1 << 10)
+
 extern size_t __mm_shifts[10];
 extern size_t __mm_widths[10];
 extern size_t __mm_sizes[10];