Changeset 23173 in vbox for trunk/src/VBox/Runtime/r0drv

Timestamp:

Sep 21, 2009 9:53:51 AM (15 years ago)

Author:

vboxsync

Message:

Remove the poke DPC from the queue if RTThreadPreemptIsPending is not working properly.

Location:

trunk/src/VBox/Runtime/r0drv/nt

Files:

• mp-r0drv-nt.cpp (modified) (1 diff)
• thread-r0drv-nt.cpp (modified) (2 diffs)

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

@@ -380 +380 @@
     return VINF_SUCCESS;
 }
+
+void rtMpPokeCpuClear()
+{
+    RTCPUID idCpu = RTMpCpuId();
+
+    /* Remove any pending poke DPC from the queue, so another call to RTMpPokeCpu will send an IPI */
+    /* Note: assuming this is a cheap operation. */
+    KeRemoveQueueDpc(&aPokeDpcs[idCpu]);
+}

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

@@ -34 +34 @@
 #include "the-nt-kernel.h"
 #include "internal/iprt.h"
+#include "internal/mp.h"
 #include <iprt/thread.h>
 
@@ -101 +102 @@
     uint32_t const offDpcQueueDepth  = g_offrtNtPbDpcQueueDepth;
     if (!offQuantumEnd && !cbQuantumEnd && !offDpcQueueDepth)
+    {
+        rtMpPokeCpuClear();
         return false;
+    }
     Assert((offQuantumEnd && cbQuantumEnd) || (!offQuantumEnd && !cbQuantumEnd));