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, double timeout)
  87 {
  88     if (timeout != 0) {
  89         volatile double deadline =
  90             timeout > 0 ? MSG_get_clock() + timeout : 0.0;
  91         xbt_mutex_acquire(mutex);
  92         while (received.empty() && (!deadline || deadline > MSG_get_clock())) {
  93             xbt_ex_t e;
  94             DEBUG0("waiting for a message to come");
  95             TRY {
  96                 if (deadline)
  97                     xbt_cond_timedwait(cond, mutex, deadline - MSG_get_clock());
  98                 else
  99                     xbt_cond_wait(cond, mutex);
 100             }
 101             CATCH (e) {
 102                 if (e.category != timeout_error)
 103                     RETHROW;
 104                 xbt_ex_free(e);
 105             }
 106         }
 107         xbt_mutex_release(mutex);
 108     }
 109
 110     if (received.empty())
 111         return false;
 112
 113     m_task_t task = received.front();
 114     received.pop();
 115     msg = (message* )MSG_task_get_data(task);
 116     from = MSG_task_get_source(task);
 117     MSG_task_destroy(task);
 118
 119     DEBUG2("received %s from %s",
 120            msg->to_string().c_str(), MSG_host_get_name(from));
 121
 122     return true;
 123 }
 124
 125 void communicator::flush(bool wait)
 126 {
 127     using std::tr1::bind;
 128     using std::tr1::placeholders::_1;
 129
 130     sent_comm.remove_if(comm_test_n_destroy);
 131     if (wait && !sent_comm.empty()) {
 132         xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 133         while (!sent_comm.empty()) {
 134             std::for_each(sent_comm.begin(), sent_comm.end(),
 135                           bind(xbt_dynar_push,
 136                                comms, bind(misc::address<msg_comm_t>(), _1)));
 137             MSG_comm_waitany(comms);
 138             xbt_dynar_reset(comms);
 139             sent_comm.remove_if(comm_test_n_destroy);
 140         }
 141         xbt_dynar_free(&comms);
 142     }
 143 }
 144
 145 bool communicator::comm_test_n_destroy(msg_comm_t comm)
 146 {
 147     if (MSG_comm_test(comm)) {
 148         MSG_comm_destroy(comm);
 149         return true;
 150     } else
 151         return false;
 152 }
 153
 154 int communicator::receiver_wrapper(int, char* [])
 155 {
 156     communicator* comm;
 157     comm = (communicator* )MSG_process_get_data(MSG_process_self());
 158     int result = comm->receiver();
 159
 160     DEBUG0("terminate");
 161     xbt_mutex_acquire(comm->mutex);
 162     comm->receiver_process = NULL;
 163     xbt_cond_signal(comm->cond);
 164     xbt_mutex_release(comm->mutex);
 165
 166     return result;
 167 }
 168
 169 int communicator::receiver()
 170 {
 171     ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 172     data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 173     DEBUG0("receiver ready");
 174     xbt_mutex_acquire(mutex);
 175     xbt_cond_signal(cond);      // signal master that we are ready
 176     xbt_mutex_release(mutex);
 177
 178     xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 179     while (ctrl_comm || data_comm) {
 180
 181         if (ctrl_comm)
 182             xbt_dynar_push(comms, &ctrl_comm);
 183         if (data_comm)
 184             xbt_dynar_push(comms, &data_comm);
 185         MSG_comm_waitany(comms);
 186         xbt_dynar_reset(comms);
 187
 188         if (ctrl_comm && comm_test_n_destroy(ctrl_comm)) {
 189             if (strcmp(MSG_task_get_name(ctrl_task), "finalize")) {
 190                 DEBUG0("received message from ctrl");
 191                 xbt_mutex_acquire(mutex);
 192                 received.push(ctrl_task);
 193                 xbt_mutex_release(mutex);
 194                 ctrl_task = NULL;
 195                 ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 196             } else {
 197                 DEBUG0("received finalize from ctrl");
 198                 MSG_task_destroy(ctrl_task);
 199                 ctrl_task = NULL;
 200                 ctrl_comm = NULL;
 201             }
 202         }
 203
 204         if (data_comm && comm_test_n_destroy(data_comm)) {
 205             if (strcmp(MSG_task_get_name(data_task), "finalize")) {
 206                 DEBUG0("received message from data");
 207                 xbt_mutex_acquire(mutex);
 208                 received.push(data_task);
 209                 xbt_mutex_release(mutex);
 210                 data_task = NULL;
 211                 data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 212             } else {
 213                 DEBUG0("received finalize from data");
 214                 MSG_task_destroy(data_task);
 215                 data_task = NULL;
 216                 data_comm = NULL;
 217             }
 218         }
 219         xbt_mutex_acquire(mutex);
 220         if (!received.empty())
 221             xbt_cond_signal(cond);
 222         xbt_mutex_release(mutex);
 223     }
 224     xbt_dynar_free(&comms);
 225     return 0;
 226 }
 227
 228 // Local variables:
 229 // mode: c++
 230 // End: