Changeset 21591 in vbox

Timestamp:

Jul 14, 2009 10:08:57 PM (16 years ago)

Author:

vboxsync

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

50090

Message:

PDMCritSectEnter: PAUSE when spinning.

File:

• trunk/src/VBox/VMM/VMMAll/PDMAllCritSect.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/PDMAllCritSect.cpp

@@ -206 +206 @@
         if (ASMAtomicCmpXchgS32(&pCritSect->s.Core.cLockers, 0, -1))
             return pdmCritSectEnterFirst(pCritSect, hNativeSelf);
-        /** @todo need pause/nop instruction here! */
+        ASMNopPause();
         /** @todo Should use monitor/mwait on e.g. &cLockers here, possibly with a
            cli'ed pendingpreemption check up front using sti w/ instruction fusing
            for avoiding races. Hmm ... This is assuming the other party is actually
-           executing code on another CPU... */
+           executing code on another CPU ... which we could keep track of if we
+           wanted. */
     }