Deal with the SIGCHLD issue in LSF.

lsb_launch tampers with SIGCHLD signal handler. We are forced to reinstall our own signal handler after a call to this function.

This commit fixes trac:1356.

This commit was SVN r19033.

The following Trac tickets were found above:
  Ticket 1356 --> https://svn.open-mpi.org/trac/ompi/ticket/1356

orte/mca/plm/lsf/plm_lsf_module.c

@@ -2,7 +2,7 @@
  * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
  *                         University Research and Technology
  *                         Corporation.  All rights reserved.
- * Copyright (c) 2004-2006 The University of Tennessee and The University
+ * Copyright (c) 2004-2008 The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
@@ -12,6 +12,8 @@
  * Copyright (c) 2006-2007 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2007      Los Alamos National Security, LLC.  All rights
  *                         reserved. 
+ * Copyright (c) 2008      Institut National de Recherche en Informatique
+ *                         et Automatique. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -289,6 +291,13 @@ static int plm_lsf_launch_job(orte_job_t *jdata)
         }        
     }
     
+    /* lsb_launch tampers with SIGCHLD.
+     * After the call to lsb_launch, the signal handler for SIGCHLD is NULL.
+     * So, we disable the SIGCHLD handler of libevent for the duration of 
+     * the call to lsb_launch
+     */
+    orte_wait_disable();
+    
     /* exec the daemon(s). Do NOT wait for lsb_launch to complete as
      * it only completes when the processes it starts - in this case,
      * the orteds - complete. We need to go ahead and return so
@@ -299,8 +308,10 @@ static int plm_lsf_launch_job(orte_job_t *jdata)
         ORTE_ERROR_LOG(ORTE_ERR_FAILED_TO_START);
         opal_output(0, "lsb_launch failed: %d", rc);
         rc = ORTE_ERR_FAILED_TO_START;
+        orte_wait_enable();  /* re-enable our SIGCHLD handler */
         goto cleanup;
     }
+    orte_wait_enable();  /* re-enable our SIGCHLD handler */
     
     /* wait for daemons to callback */
     if (ORTE_SUCCESS != 

orte/runtime/orte_wait.c

@@ -2,7 +2,7 @@
  * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
  *                         University Research and Technology
  *                         Corporation.  All rights reserved.
- * Copyright (c) 2004-2006 The University of Tennessee and The University
+ * Copyright (c) 2004-2008 The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
@@ -11,6 +11,8 @@
  *                         All rights reserved.
  * Copyright (c) 2007      Los Alamos National Security, LLC.  All rights
  *                         reserved. 
+ * Copyright (c) 2008      Institut National de Recherche en Informatique
+ *                         et Automatique. All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -209,6 +211,19 @@ static void internal_waitpid_callback(int fd, short event, void *arg);
  * Interface Functions
  *
  ********************************************************************/
+
+void
+orte_wait_disable(void)
+{
+    opal_event_del(&handler);
+}
+
+void
+orte_wait_enable(void)
+{
+    opal_event_add(&handler, NULL);
+}
+
 int
 orte_wait_init(void)
 {

orte/runtime/orte_wait.h

@@ -2,13 +2,15 @@
  * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
  *                         University Research and Technology
  *                         Corporation.  All rights reserved.
- * Copyright (c) 2004-2006 The University of Tennessee and The University
+ * Copyright (c) 2004-2008 The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
+ * Copyright (c) 2008      Institut National de Recherche en Informatique
+ *                         et Automatique. All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -48,6 +50,15 @@ BEGIN_C_DECLS
 /** typedef for callback function used in \c ompi_rte_wait_cb */
 typedef void (*orte_wait_fn_t)(pid_t wpid, int status, void *data);
 
+/**
+ * Disable / re-Enable SIGCHLD handler
+ *
+ * These functions have to be used after orte_wait_init was called.
+ */
+
+ORTE_DECLSPEC void orte_wait_enable(void);
+ORTE_DECLSPEC void orte_wait_disable(void);
+
 /**
  * Wait for process terminiation
  *