Changeset 3329 in vbox

Timestamp:

Jun 29, 2007 4:31:29 PM (18 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

22471

Message:

Main: Added AutoLock::maybeRlock()/maybeWlock() in order for conditional locking in AutoMultiLock (lockable objects may be NULL in which case the lock will be a no-op).

File:

• trunk/src/VBox/Main/include/AutoLock.h (modified) (2 diffs)

trunk/src/VBox/Main/include/AutoLock.h

@@ -270 +270 @@
     }
 
+    /**
+     *  Returns a tag to lock the given Lockable for reading by AutoMultiLock.
+     *  Shortcut to |aL->lockHandle()->rlock()|.
+     *  The returned tag is a no-op when @a aL is |NULL|.
+     */
+    static internal::LockableTag maybeRlock (Lockable *aL);
+
+    /**
+     *  Returns a tag to lock the given Lockable for writing by AutoMultiLock.
+     *  Shortcut to |aL->lockHandle()->wlock()|.
+     *  The returned tag is a no-op when @a aL is |NULL|.
+     */
+    static internal::LockableTag maybeWlock (Lockable *aL);
+
 private:
 
@@ -346 +360 @@
 {
     return internal::LockableTag (lockHandle(), 'w');
+}
+
+/* static */
+inline internal::LockableTag AutoLock::maybeRlock (AutoLock::Lockable *aL)
+{
+    return internal::LockableTag (aL ? aL->lockHandle() : NULL, 'r');
+}
+
+/* static */
+inline internal::LockableTag AutoLock::maybeWlock (AutoLock::Lockable *aL)
+{
+    return internal::LockableTag (aL ? aL->lockHandle() : NULL, 'w');
 }