OSHMEM: Fixed race condition problem in example code.

The problem was with oshmem ring code, which cycles a constant amout of data through all the processes.
When the program would expect the memory to change it did not explicitly warrent a recv() call, thus
counting on the memory region to hold the new value when in fact it could be set before or after the
check, causing slower BTLs to pass and faster ones to fail. The fix changes the logic to anticipate
the next message rather then the current one, which would be a mistake.
Patch applied to both C and fortran90 version of the example code.

reviewd by miked

cmr=v1.7.5:reviewer=ompi-rm1.7

This commit was SVN r30760.

examples/ring_oshmem_c.c

@@ -28,28 +28,28 @@ int main (int argc, char * argv[])
 
     if(proc == 0)
     {
-    	printf("Process 0 puts message %d to %d (%d processes in ring)\n", message, next, nproc);
+        printf("Process 0 puts message %d to %d (%d processes in ring)\n", message, next, nproc);
         shmem_int_put(&rbuf, &message, 1, next);
     }
 
     /* Pass the message around the ring.  The exit mechanism works as
        follows: the message (a positive integer) is passed around the
-	   ring.  Each time it passes PE 0, it is decremented.  When each
-	   processes receives a message containing a 0 value, it passes the
-	   message on to the next process and then quits.  By passing the 0
-	   message first, every process gets the 0 message and can quit
-	   normally. */
+       ring.  Each time it passes PE 0, it is decremented.  When each
+       processes receives a message containing a 0 value, it passes the
+       message on to the next process and then quits.  By passing the 0
+       message first, every process gets the 0 message and can quit
+       normally. */
 
     while(message > 0) {
         shmem_int_wait_until(&rbuf, SHMEM_CMP_EQ, message);
         if(proc == 0) {
-        	--message;
-        	printf("Process 0 decremented value: %d\n", message);
-        }
-        else {
-        	message = rbuf;
+            --message;
+            printf("Process 0 decremented value: %d\n", message);
         }
         shmem_int_put(&rbuf, &message, 1, next);
+        if(proc != 0) {
+            --message;
+        }
     }
 
     /* All done */

examples/ring_oshmemfh.f90

@@ -50,11 +50,14 @@ program ring_oshmem
         if (proc == 0) then
             message = message - 1
             write(*, '("Process 0 decremented value:", i2)') message
-        else
-            message = rbuf
         end if
 
         call shmem_put8(rbuf, message, 1, next)
+
+        if (proc > 0) then
+            message = message - 1
+        end if
+
     end do
 
 !     All done