add a test of MC detecting blocking send/send patterns

[simgrid.git] / examples / smpi / mc / sendsend.c

diff --git a/examples/smpi/mc/sendsend.c b/examples/smpi/mc/sendsend.c
new file mode 100644 (file)
index 0000000..cf83ee3
--- /dev/null
+++ b/examples/smpi/mc/sendsend.c
@@ -0,0 +1,48 @@
+/* A simple bugged MPI_Send and MPI_Recv test: it deadlocks when MPI_Send are blocking */
+
+/* Copyright (c) 2009-2019. The SimGrid Team. All rights reserved.          */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include <mpi.h>
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+  int size;
+  int rank;
+  MPI_Status status;
+
+  /* Initialize MPI */
+  int err = MPI_Init(&argc, &argv);
+  if (err != MPI_SUCCESS) {
+    printf("MPI initialization failed!\n");
+    exit(1);
+  }
+
+  MPI_Comm_size(MPI_COMM_WORLD, &size); /* Get nr of tasks */
+  MPI_Comm_rank(MPI_COMM_WORLD, &rank); /* Get id of this process */
+  if (size < 2) {
+    printf("run this program with exactly 2 processes (-np 2)\n");
+    MPI_Finalize();
+    exit(0);
+  }
+
+  int recv_buff;
+  if (rank == 0) {
+    MPI_Send(&rank, 1, MPI_INT, 1, 42, MPI_COMM_WORLD);
+    printf("Sent %d to rank 1\n", rank);
+    MPI_Recv(&recv_buff, 1, MPI_INT, 1, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
+    printf("rank 0 recv the data\n");
+  } else {
+    MPI_Send(&rank, 1, MPI_INT, 0, 42, MPI_COMM_WORLD);
+    printf("Sent %d to rank 0\n", rank);
+    MPI_Recv(&recv_buff, 1, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
+    printf("rank 1 recv the data\n");
+  }
+
+  MPI_Finalize();
+
+  return 0;
+}