Changeset 15839 in vbox

Timestamp:

Jan 7, 2009 4:07:54 PM (16 years ago)

Author:

vboxsync

Message:

Experimental implementation of RTMpIsCpuWorkPending for windows hosts.

File:

• trunk/src/VBox/Runtime/r0drv/nt/mp-r0drv-nt.cpp (modified) (1 diff)

trunk/src/VBox/Runtime/r0drv/nt/mp-r0drv-nt.cpp

@@ -116 +116 @@
 RTDECL(bool) RTMpIsCpuWorkPending()
 {
-    /** @todo (not used on non-Windows platforms yet */
+    RTCPUID idCpuEntry = RTMpCpuId();
+
+    Assert(KeGetCurrentIrql() == DISPATCH_LEVEL);
+
+    /** @todo the best solution is to check for pending DPCs, but there doesn't seem to be any documented way to do this.
+     *   The KPRCB or KPCR contains an undocumented entry, but it's too risky to make any assumptions about it.
+
+    /* Flush all pending DPCs. Not sure if we can get rescheduling as a direct result. */
+    KeFlushQueuedDpcs();
+
+    Assert(KeGetCurrentIrql() == DISPATCH_LEVEL);
+
+    if (idCpuEntry != RTMpCpuId())
+        return true;
+
+    /* We've stayed on the same CPU, so we can continue. */
     return false;
 }