Thanks to Gleb now we are able to call the schduler on Windows. Instead of using

sched_yield, we use our friend SwitchToThread.

This commit was SVN r9671.

ompi/mca/coll/sm/coll_sm.h

@@ -39,14 +39,15 @@
 #define D(foo)
 #endif
 
-#if OMPI_ENABLE_DEBUG
-#include <sched.h>
-#define SPIN sched_yield()
-#else
-#define SPIN continue
+#ifdef HAVE_SCHED_YIELD
+#  include <sched.h>
+#  define SPIN sched_yield()
+#elif __WINDOWS__
+#  define SPIN SwitchToThread()
+#else  /* no switch available */
+#  define SPIN
 #endif
 
-
 #if defined(c_plusplus) || defined(__cplusplus)
 extern "C" {
 #endif

ompi/mca/coll/sm/coll_sm_module.c

@@ -722,9 +722,7 @@ static int bootstrap_comm(ompi_communicator_t *comm)
 
         else {
             opal_atomic_unlock(&bshe->super.seg_lock);
-#ifdef HAVE_SCHED_YIELD
-            sched_yield();
-#endif
+            SPIN;
             opal_atomic_lock(&bshe->super.seg_lock);
         }
     }