Add a simple MPI_COMM_SPAWN_MULTIPLE test.

This commit was SVN r14700.

orte/test/mpi/Makefile

@@ -1,4 +1,4 @@
-PROGS = mpi_no_op hello hello_nodename abort multi_abort simple_spawn mpi_spin delayed_abort loop_spawn loop_child
+PROGS = mpi_no_op hello hello_nodename abort multi_abort simple_spawn spawn_multiple mpi_spin delayed_abort loop_spawn loop_child
 
 all: $(PROGS)
 

orte/test/mpi/spawn_multiple.c

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <sys/types.h>
+
+#include <mpi.h>
+
+int main(int argc, char* argv[])
+{
+    int msg;
+    MPI_Comm parent, child;
+    int rank, size;
+    char hostname[512];
+    pid_t pid;
+    int i;
+    char *cmds[2];
+    char *argv0[] = { "foo", NULL };
+    char *argv1[] = { "bar", NULL };
+    char **spawn_argv[2];
+    int maxprocs[] = { 1, 1 };
+    MPI_Info info[] = { MPI_INFO_NULL, MPI_INFO_NULL };
+
+    cmds[1] = cmds[0] = argv[0];
+    spawn_argv[0] = argv0;
+    spawn_argv[1] = argv1;
+
+    MPI_Init(NULL, NULL);
+    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &size);
+    MPI_Comm_get_parent(&parent);
+    /* If we get COMM_NULL back, then we're the parent */
+    if (MPI_COMM_NULL == parent) {
+        pid = getpid();
+        printf("Parent [pid %ld] about to spawn!\n", (long)pid);
+        MPI_Comm_spawn_multiple(2, cmds, spawn_argv, maxprocs, 
+                                info, 0, MPI_COMM_WORLD,
+                                &child, MPI_ERRCODES_IGNORE);
+        printf("Parent done with spawn\n");
+        if (0 == rank) {
+            msg = 38;
+            printf("Parent sending message to children\n");
+            MPI_Send(&msg, 1, MPI_INT, 0, 1, child);
+            MPI_Send(&msg, 1, MPI_INT, 1, 1, child);
+        }
+        MPI_Comm_disconnect(&child);
+        printf("Parent disconnected\n");
+    } 
+    /* Otherwise, we're the child */
+    else {
+        MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+        MPI_Comm_size(MPI_COMM_WORLD, &size);
+        gethostname(hostname, 512);
+        pid = getpid();
+        printf("Hello from the child %d of %d on host %s pid %ld: argv[1] = %s\n", rank, size, hostname, (long)pid, argv[1]);
+        if (0 == rank) {
+            MPI_Recv(&msg, 1, MPI_INT, 0, 1, parent, MPI_STATUS_IGNORE);
+            printf("Child %d received msg: %d\n", rank, msg);
+        }
+        MPI_Comm_disconnect(&parent);
+        printf("Child %d disconnected\n", rank);
+    }
+
+    MPI_Finalize();
+    return 0;
+}