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 #include "simgrid_features.h"
  13 #include "tracing.h"
  14
  15 #include "communicator.h"
  16
  17 std::string message::to_string()
  18 {
  19     static const char* str[] = { "INFO", "CREDIT", "LOAD",
  20                                  "CTRL_CLOSE", "DATA_CLOSE" };
  21     std::ostringstream oss;
  22     oss << str[type] << ": " << amount;
  23     return oss.str();
  24 }
  25
  26 communicator::communicator()
  27     : host(static_cast<hostdata*>(MSG_host_get_data(MSG_host_self())))
  28     , ctrl_task(NULL)
  29     , ctrl_comm(NULL)
  30     , data_task(NULL)
  31     , data_comm(NULL)
  32     , receiver_mutex(xbt_mutex_init())
  33     , receiver_cond(xbt_cond_init())
  34 {
  35     xbt_mutex_acquire(receiver_mutex);
  36     receiver_thread =
  37         MSG_process_create("receiver", communicator::receiver_wrapper,
  38                            this, MSG_host_self());
  39     // wait for the receiver to be ready
  40     xbt_cond_wait(receiver_cond, receiver_mutex);
  41     xbt_mutex_release(receiver_mutex);
  42 }
  43
  44 communicator::~communicator()
  45 {
  46     m_task_t task;
  47
  48     XBT_DEBUG("send finalize to receiver/ctrl");
  49     task = MSG_task_create("finalize", 0.0, 0, NULL);
  50     MSG_task_send(task, get_ctrl_mbox());
  51
  52     XBT_DEBUG("send finalize to receiver/data");
  53     task = MSG_task_create("finalize", 0.0, 0, NULL);
  54     MSG_task_send(task, get_data_mbox());
  55
  56     xbt_mutex_acquire(receiver_mutex);
  57     while (receiver_thread) {
  58         XBT_DEBUG("waiting for receiver to terminate");
  59         xbt_cond_wait(receiver_cond, receiver_mutex);
  60     }
  61     xbt_mutex_release(receiver_mutex);
  62
  63     if (ctrl_comm)
  64         XBT_WARN("ctrl_comm is pending!");
  65     if (data_comm)
  66         XBT_WARN("data_comm is pending!");
  67     if (!received.empty())
  68         XBT_WARN("lost %zu received message%s!",
  69                  received.size(), ESSE(received.size()));
  70     if (!sent_comm.empty())
  71         XBT_WARN("lost %zu sent message%s!",
  72                  sent_comm.size(), ESSE(sent_comm.size()));
  73
  74     xbt_cond_destroy(receiver_cond);
  75     xbt_mutex_destroy(receiver_mutex);
  76 }
  77
  78 void communicator::send(const char* dest, message* msg)
  79 {
  80     XBT_DEBUG("send %s to %s", msg->to_string().c_str(), dest);
  81     double msg_size = sizeof *msg;
  82     if (msg->get_type() == message::LOAD)
  83         msg_size += opt::comm_cost(msg->get_amount());
  84     m_task_t task = MSG_task_create("message", 0.0, msg_size, msg);
  85     TRACE_msg_set_task_category(task,
  86                                 msg->get_type() == message::LOAD ?
  87                                 TRACE_CAT_DATA : TRACE_CAT_CTRL);
  88     msg_comm_t comm = MSG_task_isend(task, dest);
  89     sent_comm.push_back(comm);
  90 }
  91
  92 bool communicator::recv(message*& msg, m_host_t& from, double timeout)
  93 {
  94     if (timeout != 0) {
  95         volatile double deadline =
  96             timeout > 0 ? MSG_get_clock() + timeout : 0.0;
  97         xbt_mutex_acquire(receiver_mutex);
  98         while (received.empty() && (!deadline || deadline > MSG_get_clock())) {
  99             xbt_ex_t e;
 100             XBT_DEBUG("waiting for a message to come");
 101             TRY {
 102                 if (deadline)
 103                     xbt_cond_timedwait(receiver_cond, receiver_mutex,
 104                                        deadline - MSG_get_clock());
 105                 else
 106                     xbt_cond_wait(receiver_cond, receiver_mutex);
 107             }
 108             CATCH (e) {
 109                 if (e.category != timeout_error)
 110                     RETHROW;
 111                 xbt_ex_free(e);
 112             }
 113         }
 114         xbt_mutex_release(receiver_mutex);
 115     }
 116
 117     if (received.empty())
 118         return false;
 119
 120     m_task_t task = received.front();
 121     received.pop();
 122     msg = static_cast<message*>(MSG_task_get_data(task));
 123     from = MSG_task_get_source(task);
 124     MSG_task_destroy(task);
 125
 126     XBT_DEBUG("received %s from %s",
 127            msg->to_string().c_str(), MSG_host_get_name(from));
 128
 129     return true;
 130 }
 131
 132 void communicator::flush(bool wait)
 133 {
 134     sent_comm.remove_if(comm_test_n_destroy);
 135     if (wait && !sent_comm.empty()) {
 136         msg_comm_t comms[sent_comm.size()];
 137         std::copy(sent_comm.begin(), sent_comm.end(), comms);
 138         MSG_comm_waitall(comms, sent_comm.size(), -1.0);
 139         if (!MSG_WAIT_DESTROYS_COMMS)
 140             std::for_each(sent_comm.begin(), sent_comm.end(), MSG_comm_destroy);
 141         sent_comm.clear();
 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 = static_cast<communicator*>(MSG_process_get_data(MSG_process_self()));
 158     int result = comm->receiver();
 159
 160     XBT_DEBUG("terminate");
 161     xbt_mutex_acquire(comm->receiver_mutex);
 162     comm->receiver_thread = NULL;
 163     xbt_cond_signal(comm->receiver_cond);
 164     xbt_mutex_release(comm->receiver_mutex);
 165
 166     return result;
 167 }
 168
 169 void communicator::receiver1(msg_comm_t& comm, m_task_t& task, const char* mbox)
 170 {
 171     MSG_comm_destroy(comm);
 172     if (strcmp(MSG_task_get_name(task), "finalize")) {
 173         XBT_DEBUG("received message on %s", mbox);
 174         xbt_mutex_acquire(receiver_mutex);
 175         received.push(task);
 176         xbt_cond_signal(receiver_cond);
 177         xbt_mutex_release(receiver_mutex);
 178         task = NULL;
 179         comm = MSG_task_irecv(&task, mbox);
 180     } else {
 181         XBT_DEBUG("received finalize on %s", mbox);
 182         MSG_task_destroy(task);
 183         task = NULL;
 184         comm = NULL;
 185     }
 186 }
 187
 188 int communicator::receiver()
 189 {
 190     ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 191     data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 192     XBT_DEBUG("receiver ready");
 193     xbt_mutex_acquire(receiver_mutex);
 194     xbt_cond_signal(receiver_cond); // signal master that we are ready
 195     xbt_mutex_release(receiver_mutex);
 196
 197     xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 198     while (ctrl_comm || data_comm) {
 199
 200         if (ctrl_comm)
 201             xbt_dynar_push(comms, &ctrl_comm);
 202         if (data_comm)
 203             xbt_dynar_push(comms, &data_comm);
 204         int index = MSG_comm_waitany(comms);
 205         msg_comm_t finished_comm = xbt_dynar_get_as(comms, index, msg_comm_t);
 206         xbt_dynar_reset(comms);
 207
 208         if (finished_comm == ctrl_comm)
 209             receiver1(ctrl_comm, ctrl_task, get_ctrl_mbox());
 210         else if (finished_comm == data_comm)
 211             receiver1(data_comm, data_task, get_data_mbox());
 212         else {
 213             XBT_ERROR("Handling unknown comm -- %p", finished_comm);
 214             MSG_comm_destroy(finished_comm);
 215         }
 216     }
 217     xbt_dynar_free(&comms);
 218     return 0;
 219 }
 220
 221 // Local variables:
 222 // mode: c++
 223 // End: