communicator.cpp

   1 #include <algorithm>
   2 #include <cstring>
   3 #include <tr1/functional>
   4 #include <sstream>
   5 #include <msg/msg.h>
   6 #include <xbt/log.h>
   7
   8 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(comm);
   9
  10 #include "misc.h"
  11 #include "options.h"
  12
  13 #include "communicator.h"
  14
  15 std::string message::to_string()
  16 {
  17     static const char* str[] = { "INFO", "CREDIT", "LOAD",
  18                                  "CTRL_CLOSE", "DATA_CLOSE" };
  19     std::ostringstream oss;
  20     oss << str[type] << ": " << amount;
  21     return oss.str();
  22 }
  23
  24 const int communicator::send_count_before_flush = 4;
  25
  26 communicator::communicator()
  27     : host((hostdata* )MSG_host_get_data(MSG_host_self()))
  28     , mutex(xbt_mutex_init())
  29     , cond(xbt_cond_init())
  30     , send_counter(0)
  31     , ctrl_task(NULL)
  32     , ctrl_comm(NULL)
  33     , data_task(NULL)
  34     , data_comm(NULL)
  35 {
  36     xbt_mutex_acquire(mutex);
  37     receiver_process =
  38         MSG_process_create("receiver", communicator::receiver_wrapper,
  39                            this, MSG_host_self());
  40     xbt_mutex_release(mutex);
  41 }
  42
  43 communicator::~communicator()
  44 {
  45     m_task_t task;
  46
  47     DEBUG0("send finalize to receiver/ctrl");
  48     task = MSG_task_create("finalize", 0.0, 0, NULL);
  49     MSG_task_send(task, get_ctrl_mbox());
  50
  51     DEBUG0("send finalize to receiver/data");
  52     task = MSG_task_create("finalize", 0.0, 0, NULL);
  53     MSG_task_send(task, get_data_mbox());
  54
  55     DEBUG0("wait for receiver to terminate");
  56     xbt_mutex_acquire(mutex);
  57     while (receiver_process)
  58         xbt_cond_wait(cond, mutex);
  59     xbt_mutex_release(mutex);
  60
  61     if (ctrl_comm)
  62         WARN0("ctrl_comm is pending!");
  63     if (data_comm)
  64         WARN0("data_comm is pending!");
  65     if (!received.empty())
  66         WARN2("lost %lu received message%s!",
  67               (unsigned long )received.size(), ESSE(received.size()));
  68     if (!sent_comm.empty())
  69         WARN2("lost %lu sent message%s!",
  70               (unsigned long )sent_comm.size(), ESSE(sent_comm.size()));
  71
  72     xbt_cond_destroy(cond);
  73     xbt_mutex_destroy(mutex);
  74 }
  75
  76 void communicator::send(const char* dest, message* msg)
  77 {
  78     DEBUG2("send %s to %s", msg->to_string().c_str(), dest);
  79     double msg_size = sizeof *msg;
  80     if (msg->get_type() == message::LOAD)
  81         msg_size += opt::comm_cost(msg->get_amount());
  82     m_task_t task = MSG_task_create("message", 0.0, msg_size, msg);
  83     msg_comm_t comm = MSG_task_isend(task, dest);
  84     sent_comm.push_back(comm);
  85
  86     if (++send_counter >= send_count_before_flush) {
  87         flush(false);
  88         send_counter = 0;
  89     }
  90 }
  91
  92 bool communicator::recv(message*& msg, m_host_t& from, bool wait)
  93 {
  94     if (wait) {
  95         DEBUG0("suspend main process on recv");
  96         xbt_mutex_acquire(mutex);
  97         while (received.empty())
  98             xbt_cond_wait(cond, mutex);
  99         xbt_mutex_release(mutex);
 100     }
 101
 102     if (received.empty())
 103         return false;
 104
 105     m_task_t task = received.front();
 106     received.pop();
 107     msg = (message* )MSG_task_get_data(task);
 108     from = MSG_task_get_source(task);
 109     MSG_task_destroy(task);
 110
 111     DEBUG2("received %s from %s",
 112            msg->to_string().c_str(), MSG_host_get_name(from));
 113
 114     return true;
 115 }
 116
 117 void communicator::flush(bool wait)
 118 {
 119     using std::tr1::bind;
 120     using std::tr1::placeholders::_1;
 121
 122     sent_comm.remove_if(comm_test_n_destroy);
 123     if (wait && !sent_comm.empty()) {
 124         xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 125         while (!sent_comm.empty()) {
 126             std::for_each(sent_comm.begin(), sent_comm.end(),
 127                           bind(xbt_dynar_push,
 128                                comms, bind(misc::address<msg_comm_t>(), _1)));
 129             MSG_comm_waitany(comms);
 130             xbt_dynar_reset(comms);
 131             sent_comm.remove_if(comm_test_n_destroy);
 132         }
 133         xbt_dynar_free(&comms);
 134     }
 135 }
 136
 137 bool communicator::comm_test_n_destroy(msg_comm_t comm)
 138 {
 139     if (MSG_comm_test(comm)) {
 140         MSG_comm_destroy(comm);
 141         return true;
 142     } else
 143         return false;
 144 }
 145
 146 int communicator::receiver_wrapper(int, char* [])
 147 {
 148     communicator* comm;
 149     comm = (communicator* )MSG_process_get_data(MSG_process_self());
 150     int result = comm->receiver();
 151
 152     DEBUG0("terminate");
 153     xbt_mutex_acquire(comm->mutex);
 154     comm->receiver_process = NULL;
 155     xbt_cond_signal(comm->cond);
 156     xbt_mutex_release(comm->mutex);
 157
 158     return result;
 159 }
 160
 161 int communicator::receiver()
 162 {
 163     ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 164     data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 165     xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 166     while (ctrl_comm || data_comm) {
 167
 168         if (ctrl_comm)
 169             xbt_dynar_push(comms, &ctrl_comm);
 170         if (data_comm)
 171             xbt_dynar_push(comms, &data_comm);
 172         MSG_comm_waitany(comms);
 173         xbt_dynar_reset(comms);
 174
 175         if (ctrl_comm && comm_test_n_destroy(ctrl_comm)) {
 176             if (strcmp(MSG_task_get_name(ctrl_task), "finalize")) {
 177                 DEBUG0("received message from ctrl");
 178                 received.push(ctrl_task);
 179                 ctrl_task = NULL;
 180                 ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 181             } else {
 182                 DEBUG0("received finalize from ctrl");
 183                 MSG_task_destroy(ctrl_task);
 184                 ctrl_task = NULL;
 185                 ctrl_comm = NULL;
 186             }
 187         }
 188
 189         if (data_comm && comm_test_n_destroy(data_comm)) {
 190             if (strcmp(MSG_task_get_name(data_task), "finalize")) {
 191                 DEBUG0("received message from data");
 192                 received.push(data_task);
 193                 data_task = NULL;
 194                 data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 195             } else {
 196                 DEBUG0("received finalize from data");
 197                 MSG_task_destroy(data_task);
 198                 data_task = NULL;
 199                 data_comm = NULL;
 200             }
 201         }
 202         xbt_mutex_acquire(mutex);
 203         xbt_cond_signal(cond);
 204         xbt_mutex_release(mutex);
 205     }
 206     xbt_dynar_free(&comms);
 207     return 0;
 208 }
 209
 210 // Local variables:
 211 // mode: c++
 212 // End: