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_mutex_release(mutex);
  38 }
  39
  40 communicator::~communicator()
  41 {
  42     m_task_t task;
  43
  44     DEBUG0("send finalize to receiver/ctrl");
  45     task = MSG_task_create("finalize", 0.0, 0, NULL);
  46     MSG_task_send(task, get_ctrl_mbox());
  47
  48     DEBUG0("send finalize to receiver/data");
  49     task = MSG_task_create("finalize", 0.0, 0, NULL);
  50     MSG_task_send(task, get_data_mbox());
  51
  52     xbt_mutex_acquire(mutex);
  53     while (receiver_process) {
  54         DEBUG0("waiting for receiver to terminate");
  55         xbt_cond_wait(cond, mutex);
  56     }
  57     xbt_mutex_release(mutex);
  58
  59     if (ctrl_comm)
  60         WARN0("ctrl_comm is pending!");
  61     if (data_comm)
  62         WARN0("data_comm is pending!");
  63     if (!received.empty())
  64         WARN2("lost %lu received message%s!",
  65               (unsigned long )received.size(), ESSE(received.size()));
  66     if (!sent_comm.empty())
  67         WARN2("lost %lu sent message%s!",
  68               (unsigned long )sent_comm.size(), ESSE(sent_comm.size()));
  69
  70     xbt_cond_destroy(cond);
  71     xbt_mutex_destroy(mutex);
  72 }
  73
  74 void communicator::send(const char* dest, message* msg)
  75 {
  76     DEBUG2("send %s to %s", msg->to_string().c_str(), dest);
  77     double msg_size = sizeof *msg;
  78     if (msg->get_type() == message::LOAD)
  79         msg_size += opt::comm_cost(msg->get_amount());
  80     m_task_t task = MSG_task_create("message", 0.0, msg_size, msg);
  81     msg_comm_t comm = MSG_task_isend(task, dest);
  82     sent_comm.push_back(comm);
  83 }
  84
  85 bool communicator::recv(message*& msg, m_host_t& from, bool wait)
  86 {
  87     if (wait) {
  88         xbt_mutex_acquire(mutex);
  89         while (received.empty()) {
  90             DEBUG0("waiting for a message to come");
  91             xbt_cond_wait(cond, mutex);
  92         }
  93         xbt_mutex_release(mutex);
  94     }
  95
  96     if (received.empty())
  97         return false;
  98
  99     m_task_t task = received.front();
 100     received.pop();
 101     msg = (message* )MSG_task_get_data(task);
 102     from = MSG_task_get_source(task);
 103     MSG_task_destroy(task);
 104
 105     DEBUG2("received %s from %s",
 106            msg->to_string().c_str(), MSG_host_get_name(from));
 107
 108     return true;
 109 }
 110
 111 void communicator::flush(bool wait)
 112 {
 113     using std::tr1::bind;
 114     using std::tr1::placeholders::_1;
 115
 116     sent_comm.remove_if(comm_test_n_destroy);
 117     if (wait && !sent_comm.empty()) {
 118         xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 119         while (!sent_comm.empty()) {
 120             std::for_each(sent_comm.begin(), sent_comm.end(),
 121                           bind(xbt_dynar_push,
 122                                comms, bind(misc::address<msg_comm_t>(), _1)));
 123             MSG_comm_waitany(comms);
 124             xbt_dynar_reset(comms);
 125             sent_comm.remove_if(comm_test_n_destroy);
 126         }
 127         xbt_dynar_free(&comms);
 128     }
 129 }
 130
 131 bool communicator::comm_test_n_destroy(msg_comm_t comm)
 132 {
 133     if (MSG_comm_test(comm)) {
 134         MSG_comm_destroy(comm);
 135         return true;
 136     } else
 137         return false;
 138 }
 139
 140 int communicator::receiver_wrapper(int, char* [])
 141 {
 142     communicator* comm;
 143     comm = (communicator* )MSG_process_get_data(MSG_process_self());
 144     int result = comm->receiver();
 145
 146     DEBUG0("terminate");
 147     xbt_mutex_acquire(comm->mutex);
 148     comm->receiver_process = NULL;
 149     xbt_cond_signal(comm->cond);
 150     xbt_mutex_release(comm->mutex);
 151
 152     return result;
 153 }
 154
 155 int communicator::receiver()
 156 {
 157     ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 158     data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 159     xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 160     while (ctrl_comm || data_comm) {
 161
 162         if (ctrl_comm)
 163             xbt_dynar_push(comms, &ctrl_comm);
 164         if (data_comm)
 165             xbt_dynar_push(comms, &data_comm);
 166         MSG_comm_waitany(comms);
 167         xbt_dynar_reset(comms);
 168
 169         if (ctrl_comm && comm_test_n_destroy(ctrl_comm)) {
 170             if (strcmp(MSG_task_get_name(ctrl_task), "finalize")) {
 171                 DEBUG0("received message from ctrl");
 172                 received.push(ctrl_task);
 173                 ctrl_task = NULL;
 174                 ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 175             } else {
 176                 DEBUG0("received finalize from ctrl");
 177                 MSG_task_destroy(ctrl_task);
 178                 ctrl_task = NULL;
 179                 ctrl_comm = NULL;
 180             }
 181         }
 182
 183         if (data_comm && comm_test_n_destroy(data_comm)) {
 184             if (strcmp(MSG_task_get_name(data_task), "finalize")) {
 185                 DEBUG0("received message from data");
 186                 received.push(data_task);
 187                 data_task = NULL;
 188                 data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 189             } else {
 190                 DEBUG0("received finalize from data");
 191                 MSG_task_destroy(data_task);
 192                 data_task = NULL;
 193                 data_comm = NULL;
 194             }
 195         }
 196         xbt_mutex_acquire(mutex);
 197         xbt_cond_signal(cond);
 198         xbt_mutex_release(mutex);
 199     }
 200     xbt_dynar_free(&comms);
 201     return 0;
 202 }
 203
 204 // Local variables:
 205 // mode: c++
 206 // End: