Add comments on the definition of SPIN_LOCK_RELEASED & SPIN_LOCK_ACQUIRED

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2522 6f19259b-4bc3-4df7-8a09-765794883524
2007-04-02 08:15:58 +00:00 · 2007-04-02 08:15:58 +00:00 · eb9603a0b7
parent e22f5aaab7
commit eb9603a0b7
1 changed files with 4 additions and 0 deletions
--- a/MdePkg/Library/BaseLib/Synchronization.c
+++ b/MdePkg/Library/BaseLib/Synchronization.c
@ -16,6 +16,10 @@

 #include "BaseLibInternals.h"

+//
+// SPIN_LOCK_RELEASED & SPIN_LOCK_ACQUIRED should belong to type "SPIN_LOCK".
+// Here we use type-case "UINTN" to avoid "volatile" modifier on const integers.
+//
 #define SPIN_LOCK_RELEASED          ((UINTN) 1)
 #define SPIN_LOCK_ACQUIRED          ((UINTN) 2)