X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/0f29c57b4aa4066cdfd6ed1fbce87855aa07fd13..3eb70586943153b08d37dfd66e0ba5e95b0abc24:/examples/c/comm-waitany/comm-waitany.c

diff --git a/examples/c/comm-waitany/comm-waitany.c b/examples/c/comm-waitany/comm-waitany.c
new file mode 100644
index 0000000000..248a219db0
--- /dev/null
+++ b/examples/c/comm-waitany/comm-waitany.c
@@ -0,0 +1,121 @@
+/* Copyright (c) 2010-2020. 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 "simgrid/actor.h"
+#include "simgrid/comm.h"
+#include "simgrid/engine.h"
+#include "simgrid/forward.h"
+#include "simgrid/mailbox.h"
+#include "xbt/asserts.h"
+#include "xbt/log.h"
+#include "xbt/str.h"
+
+#include <stdio.h> /* snprintf */
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(comm_waitany, "Messages specific for this example");
+
+static void sender(int argc, char* argv[])
+{
+  xbt_assert(argc == 4, "Expecting 3 parameters from the XML deployment file but got %d", argc);
+  long messages_count  = xbt_str_parse_int(argv[1], "Invalid message count: %s");
+  long msg_size        = xbt_str_parse_int(argv[2], "Invalid message size: %s");
+  long receivers_count = xbt_str_parse_int(argv[3], "Invalid amount of receivers: %s");
+
+  /* Array in which we store all ongoing communications */
+  sg_comm_t* pending_comms = xbt_malloc(sizeof(sg_comm_t) * (messages_count + receivers_count));
+  int pending_comms_count  = 0;
+
+  /* Make an array of the mailboxes to use */
+  sg_mailbox_t* mboxes = xbt_malloc(sizeof(sg_mailbox_t) * receivers_count);
+  for (long i = 0; i < receivers_count; i++) {
+    char mailbox_name[80];
+    snprintf(mailbox_name, 79, "receiver-%ld", i);
+    sg_mailbox_t mbox = sg_mailbox_by_name(mailbox_name);
+    mboxes[i]         = mbox;
+  }
+
+  /* Start dispatching all messages to receivers, in a round robin fashion */
+  for (int i = 0; i < messages_count; i++) {
+    char msg_content[80];
+    snprintf(msg_content, 79, "Message %d", i);
+    sg_mailbox_t mbox = mboxes[i % receivers_count];
+    XBT_INFO("Send '%s' to '%s'", msg_content, sg_mailbox_get_name(mbox));
+
+    /* Create a communication representing the ongoing communication, and store it in pending_comms */
+    pending_comms[pending_comms_count++] = sg_mailbox_put_async(mbox, xbt_strdup(msg_content), msg_size);
+  }
+  /* Start sending messages to let the workers know that they should stop */
+  for (int i = 0; i < receivers_count; i++) {
+    XBT_INFO("Send 'finalize' to 'receiver-%d'", i);
+    char* end_msg                        = xbt_strdup("finalize");
+    sg_mailbox_t mbox                    = mboxes[i % receivers_count];
+    pending_comms[pending_comms_count++] = sg_mailbox_put_async(mbox, end_msg, 0);
+  }
+
+  XBT_INFO("Done dispatching all messages");
+
+  /* Now that all message exchanges were initiated, wait for their completion, in order of termination.
+   *
+   * This loop waits for first terminating message with wait_any() and remove it from the array (with a memmove),
+   *  until all comms are terminated.
+   * Even in this simple example, the pending comms do not terminate in the exact same order of creation.
+   */
+  while (pending_comms_count != 0) {
+    int changed_pos = sg_comm_wait_any(pending_comms, pending_comms_count);
+    memmove(pending_comms + changed_pos, pending_comms + changed_pos + 1,
+            sizeof(sg_comm_t) * (pending_comms_count - changed_pos - 1));
+    pending_comms_count--;
+
+    if (changed_pos != 0)
+      XBT_INFO("Remove the %dth pending comm: it terminated earlier than another comm that was initiated first.",
+               changed_pos);
+  }
+
+  free(pending_comms);
+  free(mboxes);
+
+  XBT_INFO("Goodbye now!");
+}
+
+static void receiver(int argc, char* argv[])
+{
+  xbt_assert(argc == 2, "Expecting one parameter from the XML deployment file but got %d", argc);
+  int id = xbt_str_parse_int(argv[1], "ID should be numerical, not %s");
+  char mailbox_name[80];
+  snprintf(mailbox_name, 79, "receiver-%d", id);
+  sg_mailbox_t mbox = sg_mailbox_by_name(mailbox_name);
+  XBT_INFO("Wait for my first message on '%s'", mailbox_name);
+  while (1) {
+    char* received = (char*)sg_mailbox_get(mbox);
+    XBT_INFO("I got a '%s'.", received);
+    if (!strcmp(received, "finalize")) { // If it's a finalize message, we're done
+      xbt_free(received);
+      break;
+    }
+    xbt_free(received);
+  }
+
+  XBT_INFO("I'm done. See you!");
+}
+
+int main(int argc, char* argv[])
+{
+  simgrid_init(&argc, argv);
+  xbt_assert(argc > 2,
+             "Usage: %s platform_file deployment_file\n"
+             "\tExample: %s msg_platform.xml msg_deployment.xml\n",
+             argv[0], argv[0]);
+
+  simgrid_load_platform(argv[1]);
+
+  simgrid_register_function("sender", sender);
+  simgrid_register_function("receiver", receiver);
+  simgrid_load_deployment(argv[2]);
+
+  simgrid_run();
+  XBT_INFO("Simulation time %g", simgrid_get_clock());
+
+  return 0;
+}