communicator.cpp

   1 #include <algorithm>
   2 #include <msg/msg.h>
   3 #include <xbt/log.h>
   4
   5 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(comm);
   6
   7 #include "misc.h"
   8 #include "options.h"
   9 #include "simgrid_features.h"
  10 #include "tracing.h"
  11
  12 #include "communicator.h"
  13
  14 communicator::communicator()
  15     : host(static_cast<hostdata*>(MSG_host_get_data(MSG_host_self())))
  16 {
  17     receiver_mutex.acquire();
  18     receiver_thread =
  19         MSG_process_create("receiver", communicator::receiver_wrapper,
  20                            this, MSG_host_self());
  21     receiver_cond.wait(receiver_mutex); // wait for the receiver to be ready
  22     receiver_mutex.release();
  23 }
  24
  25 communicator::~communicator()
  26 {
  27     m_task_t task;
  28
  29     XBT_DEBUG("send finalize to receiver/ctrl");
  30     task = MSG_task_create("finalize", 0.0, 0, NULL);
  31     MSG_task_send(task, host->get_ctrl_mbox());
  32
  33     XBT_DEBUG("send finalize to receiver/data");
  34     task = MSG_task_create("finalize", 0.0, 0, NULL);
  35     MSG_task_send(task, host->get_data_mbox());
  36
  37     receiver_mutex.acquire();
  38     while (receiver_thread) {
  39         XBT_DEBUG("waiting for receiver to terminate");
  40         receiver_cond.wait(receiver_mutex);
  41     }
  42     receiver_mutex.release();
  43
  44     if (!received.empty())
  45         XBT_WARN("lost %zu received message%s!",
  46                  received.size(), ESSE(received.size()));
  47     if (!sent_comm.empty())
  48         XBT_WARN("lost %zu sent message%s!",
  49                  sent_comm.size(), ESSE(sent_comm.size()));
  50 }
  51
  52 void communicator::send(const char* dest, message* msg)
  53 {
  54     XBT_DEBUG("send %s to %s", msg->to_string().c_str(), dest);
  55     double msg_size = sizeof *msg;
  56     if (msg->get_type() == message::LOAD)
  57         msg_size += opt::comm_cost(msg->get_amount());
  58     m_task_t task = MSG_task_create("message", 0.0, msg_size, msg);
  59     TRACE_msg_set_task_category(task,
  60                                 msg->get_type() == message::LOAD ?
  61                                 TRACE_CAT_DATA : TRACE_CAT_CTRL);
  62     msg_comm_t comm = MSG_task_isend(task, dest);
  63     sent_comm.push_back(comm);
  64 }
  65
  66 void communicator::flush(bool wait)
  67 {
  68     sent_comm.remove_if(comm_test_n_destroy);
  69     if (wait && !sent_comm.empty()) {
  70         msg_comm_t comms[sent_comm.size()];
  71         std::copy(sent_comm.begin(), sent_comm.end(), comms);
  72         MSG_comm_waitall(comms, sent_comm.size(), -1.0);
  73         if (!MSG_WAIT_DESTROYS_COMMS)
  74             std::for_each(sent_comm.begin(), sent_comm.end(),
  75                           comm_check_n_destroy);
  76         sent_comm.clear();
  77     }
  78 }
  79
  80 bool communicator::recv(message*& msg, m_host_t& from, double timeout)
  81 {
  82     XBT_DEBUG("waiting for a message to come");
  83     bool recvd = received.pop(msg, from, timeout);
  84     if (recvd)
  85         XBT_DEBUG("received %s from %s",
  86                   msg->to_string().c_str(), MSG_host_get_name(from));
  87     return recvd;
  88 }
  89
  90 int communicator::receiver_wrapper(int, char* [])
  91 {
  92     communicator* comm;
  93     comm = static_cast<communicator*>(MSG_process_get_data(MSG_process_self()));
  94     comm->receiver();
  95
  96     XBT_DEBUG("terminate");
  97     comm->receiver_mutex.acquire();
  98     comm->receiver_thread = NULL;
  99     comm->receiver_cond.signal();
 100     comm->receiver_mutex.release();
 101
 102     return 0;
 103 }
 104
 105 void communicator::receiver()
 106 {
 107     xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 108     struct channel {
 109         msg_comm_t comm;
 110         m_task_t task;
 111         const char* mbox;
 112     };
 113     channel chan[] = { { NULL, NULL, host->get_ctrl_mbox() },
 114                        { NULL, NULL, host->get_data_mbox() } };
 115     const int chan_size = (sizeof chan) / (sizeof chan[0]);
 116
 117     for (int i = 0 ; i < chan_size ; ++i) {
 118         chan[i].comm = MSG_task_irecv(&chan[i].task, chan[i].mbox);
 119         xbt_dynar_push(comms, &chan[i].comm);
 120     }
 121
 122     XBT_DEBUG("receiver ready");
 123     receiver_mutex.acquire();
 124     receiver_cond.signal();     // signal master that we are ready
 125     receiver_mutex.release();
 126
 127     while (!xbt_dynar_is_empty(comms)) {
 128
 129         int index = MSG_comm_waitany(comms);
 130         msg_comm_t finished_comm = xbt_dynar_get_as(comms, index, msg_comm_t);
 131         channel* ch;
 132
 133         for (ch = chan ; ch->comm != finished_comm ; ++ch)
 134             /* nop */;
 135
 136         comm_check_n_destroy(ch->comm);
 137         if (strcmp(MSG_task_get_name(ch->task), "finalize")) {
 138             XBT_DEBUG("received message on %s", ch->mbox);
 139             received.push(ch->task);
 140             ch->task = NULL;
 141             ch->comm = MSG_task_irecv(&ch->task, ch->mbox);
 142             xbt_dynar_set_as(comms, index, msg_comm_t, ch->comm);
 143         } else {
 144             XBT_DEBUG("received finalize on %s", ch->mbox);
 145             MSG_task_destroy(ch->task);
 146             ch->task = NULL;
 147             ch->comm = NULL;
 148             xbt_dynar_remove_at(comms, index, NULL);
 149         }
 150
 151     }
 152     xbt_dynar_free(&comms);
 153 }
 154
 155 void communicator::comm_check_n_destroy(msg_comm_t comm)
 156 {
 157     xbt_assert(MSG_comm_get_status(comm) == MSG_OK);
 158     MSG_comm_destroy(comm);
 159 }
 160
 161 bool communicator::comm_test_n_destroy(msg_comm_t comm)
 162 {
 163     if (MSG_comm_test(comm)) {
 164         comm_check_n_destroy(comm);
 165         return true;
 166     } else
 167         return false;
 168 }
 169
 170 // Local variables:
 171 // mode: c++
 172 // End: