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 communicator::communicator()
  25     : host((hostdata* )MSG_host_get_data(MSG_host_self()))
  26     , mutex(xbt_mutex_init())
  27     , cond(xbt_cond_init())
  28     , ctrl_task(NULL)
  29     , ctrl_comm(NULL)
  30     , data_task(NULL)
  31     , data_comm(NULL)
  32 {
  33     xbt_mutex_acquire(mutex);
  34     receiver_process =
  35         MSG_process_create("receiver", communicator::receiver_wrapper,
  36                            this, MSG_host_self());
  37     xbt_cond_wait(cond, mutex); // wait for the receiver to be ready
  38     xbt_mutex_release(mutex);
  39 }
  40
  41 communicator::~communicator()
  42 {
  43     m_task_t task;
  44
  45     DEBUG0("send finalize to receiver/ctrl");
  46     task = MSG_task_create("finalize", 0.0, 0, NULL);
  47     MSG_task_send(task, get_ctrl_mbox());
  48
  49     DEBUG0("send finalize to receiver/data");
  50     task = MSG_task_create("finalize", 0.0, 0, NULL);
  51     MSG_task_send(task, get_data_mbox());
  52
  53     xbt_mutex_acquire(mutex);
  54     while (receiver_process) {
  55         DEBUG0("waiting for receiver to terminate");
  56         xbt_cond_wait(cond, mutex);
  57     }
  58     xbt_mutex_release(mutex);
  59
  60     if (ctrl_comm)
  61         WARN0("ctrl_comm is pending!");
  62     if (data_comm)
  63         WARN0("data_comm is pending!");
  64     if (!received.empty())
  65         WARN2("lost %lu received message%s!",
  66               (unsigned long )received.size(), ESSE(received.size()));
  67     if (!sent_comm.empty())
  68         WARN2("lost %lu sent message%s!",
  69               (unsigned long )sent_comm.size(), ESSE(sent_comm.size()));
  70
  71     xbt_cond_destroy(cond);
  72     xbt_mutex_destroy(mutex);
  73 }
  74
  75 void communicator::send(const char* dest, message* msg)
  76 {
  77     DEBUG2("send %s to %s", msg->to_string().c_str(), dest);
  78     double msg_size = sizeof *msg;
  79     if (msg->get_type() == message::LOAD)
  80         msg_size += opt::comm_cost(msg->get_amount());
  81     m_task_t task = MSG_task_create("message", 0.0, msg_size, msg);
  82     msg_comm_t comm = MSG_task_isend(task, dest);
  83     sent_comm.push_back(comm);
  84 }
  85
  86 bool communicator::recv(message*& msg, m_host_t& from, bool wait)
  87 {
  88     if (wait) {
  89         xbt_mutex_acquire(mutex);
  90         while (received.empty()) {
  91             DEBUG0("waiting for a message to come");
  92             xbt_cond_wait(cond, mutex);
  93         }
  94         xbt_mutex_release(mutex);
  95     }
  96
  97     if (received.empty())
  98         return false;
  99
 100     m_task_t task = received.front();
 101     received.pop();
 102     msg = (message* )MSG_task_get_data(task);
 103     from = MSG_task_get_source(task);
 104     MSG_task_destroy(task);
 105
 106     DEBUG2("received %s from %s",
 107            msg->to_string().c_str(), MSG_host_get_name(from));
 108
 109     return true;
 110 }
 111
 112 void communicator::flush(bool wait)
 113 {
 114     using std::tr1::bind;
 115     using std::tr1::placeholders::_1;
 116
 117     sent_comm.remove_if(comm_test_n_destroy);
 118     if (wait && !sent_comm.empty()) {
 119         xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 120         while (!sent_comm.empty()) {
 121             std::for_each(sent_comm.begin(), sent_comm.end(),
 122                           bind(xbt_dynar_push,
 123                                comms, bind(misc::address<msg_comm_t>(), _1)));
 124             MSG_comm_waitany(comms);
 125             xbt_dynar_reset(comms);
 126             sent_comm.remove_if(comm_test_n_destroy);
 127         }
 128         xbt_dynar_free(&comms);
 129     }
 130 }
 131
 132 bool communicator::comm_test_n_destroy(msg_comm_t comm)
 133 {
 134     if (MSG_comm_test(comm)) {
 135         MSG_comm_destroy(comm);
 136         return true;
 137     } else
 138         return false;
 139 }
 140
 141 int communicator::receiver_wrapper(int, char* [])
 142 {
 143     communicator* comm;
 144     comm = (communicator* )MSG_process_get_data(MSG_process_self());
 145     int result = comm->receiver();
 146
 147     DEBUG0("terminate");
 148     xbt_mutex_acquire(comm->mutex);
 149     comm->receiver_process = NULL;
 150     xbt_cond_signal(comm->cond);
 151     xbt_mutex_release(comm->mutex);
 152
 153     return result;
 154 }
 155
 156 int communicator::receiver()
 157 {
 158     ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 159     data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 160     DEBUG0("receiver ready");
 161     xbt_mutex_acquire(mutex);
 162     xbt_cond_signal(cond);      // signal master that we are ready
 163     xbt_mutex_release(mutex);
 164
 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                 xbt_mutex_acquire(mutex);
 179                 received.push(ctrl_task);
 180                 xbt_mutex_release(mutex);
 181                 ctrl_task = NULL;
 182                 ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 183             } else {
 184                 DEBUG0("received finalize from ctrl");
 185                 MSG_task_destroy(ctrl_task);
 186                 ctrl_task = NULL;
 187                 ctrl_comm = NULL;
 188             }
 189         }
 190
 191         if (data_comm && comm_test_n_destroy(data_comm)) {
 192             if (strcmp(MSG_task_get_name(data_task), "finalize")) {
 193                 DEBUG0("received message from data");
 194                 xbt_mutex_acquire(mutex);
 195                 received.push(data_task);
 196                 xbt_mutex_release(mutex);
 197                 data_task = NULL;
 198                 data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 199             } else {
 200                 DEBUG0("received finalize from data");
 201                 MSG_task_destroy(data_task);
 202                 data_task = NULL;
 203                 data_comm = NULL;
 204             }
 205         }
 206         xbt_mutex_acquire(mutex);
 207         if (!received.empty())
 208             xbt_cond_signal(cond);
 209         xbt_mutex_release(mutex);
 210     }
 211     xbt_dynar_free(&comms);
 212     return 0;
 213 }
 214
 215 // Local variables:
 216 // mode: c++
 217 // End: