Changeset 88d594a in rtems for c/src/lib/libbsp/shmdr/poll.c

Timestamp:

05/24/95 21:39:42 (29 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

5b9d6ddf

Parents:

bf61e45c

Message:

Fully tested on all in-house targets

File:

• c/src/lib/libbsp/shmdr/poll.c (modified) (2 diffs)

c/src/lib/libbsp/shmdr/poll.c

@@ -17 +17 @@
  *  notice must appear in all copies of this file and its derivatives.
  *
- *  $Id$
+ *  poll.c,v 1.2 1995/05/09 20:22:57 joel Exp
  */
 
 #include <rtems.h>
+#include <rtems/sysstate.h>
 #include "shm.h"
 #include "clockdrv.h"
@@ -30 +31 @@
   Clock_isr( 0 );             /* invoke standard clock ISR */
 
-  /* enable_tracing(); */
-  /* ticks += 1; */
-  Shm_Lock( Shm_Local_receive_queue );
-    tmpfront = Shm_Local_receive_queue->front;
-  Shm_Unlock( Shm_Local_receive_queue );
-  if ( Shm_Convert(tmpfront) == Shm_Locked_queue_End_of_list ) return;
-  rtems_multiprocessing_announce();
-  Shm_Interrupt_count++;
+
+  /*
+   * Check for msgs only if we are "up"
+   * This avoids a race condition where we may get a clock
+   * interrupt before MPCI has completed its init
+   */
+  
+  if (_System_state_Is_up(_System_state_Get()))
+  {
+      /* enable_tracing(); */
+      /* ticks += 1; */
+      Shm_Lock( Shm_Local_receive_queue );
+      tmpfront = Shm_Local_receive_queue->front;
+      Shm_Unlock( Shm_Local_receive_queue );
+      if ( Shm_Convert(tmpfront) == Shm_Locked_queue_End_of_list ) return;
+      rtems_multiprocessing_announce();
+      Shm_Interrupt_count++;
+  }
 }