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     , mutex(xbt_mutex_init())
  29     , cond(xbt_cond_init())
  30     , ctrl_task(NULL)
  31     , ctrl_comm(NULL)
  32     , data_task(NULL)
  33     , data_comm(NULL)
  34 {
  35     xbt_mutex_acquire(mutex);
  36     receiver_process =
  37         MSG_process_create("receiver", communicator::receiver_wrapper,
  38                            this, MSG_host_self());
  39     xbt_cond_wait(cond, mutex); // wait for the receiver to be ready
  40     xbt_mutex_release(mutex);
  41 }
  42
  43 communicator::~communicator()
  44 {
  45     m_task_t task;
  46
  47     XBT_DEBUG("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     XBT_DEBUG("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     xbt_mutex_acquire(mutex);
  56     while (receiver_process) {
  57         XBT_DEBUG("waiting for receiver to terminate");
  58         xbt_cond_wait(cond, mutex);
  59     }
  60     xbt_mutex_release(mutex);
  61
  62     if (ctrl_comm)
  63         XBT_WARN("ctrl_comm is pending!");
  64     if (data_comm)
  65         XBT_WARN("data_comm is pending!");
  66     if (!received.empty())
  67         XBT_WARN("lost %zu received message%s!",
  68                  received.size(), ESSE(received.size()));
  69     if (!sent_comm.empty())
  70         XBT_WARN("lost %zu sent message%s!",
  71                  sent_comm.size(), ESSE(sent_comm.size()));
  72
  73     xbt_cond_destroy(cond);
  74     xbt_mutex_destroy(mutex);
  75 }
  76
  77 void communicator::send(const char* dest, message* msg)
  78 {
  79     XBT_DEBUG("send %s to %s", msg->to_string().c_str(), dest);
  80     double msg_size = sizeof *msg;
  81     if (msg->get_type() == message::LOAD)
  82         msg_size += opt::comm_cost(msg->get_amount());
  83     m_task_t task = MSG_task_create("message", 0.0, msg_size, msg);
  84     TRACE_msg_set_task_category(task,
  85                                 msg->get_type() == message::LOAD ?
  86                                 TRACE_CAT_DATA : TRACE_CAT_CTRL);
  87     msg_comm_t comm = MSG_task_isend(task, dest);
  88     sent_comm.push_back(comm);
  89 }
  90
  91 bool communicator::recv(message*& msg, m_host_t& from, double timeout)
  92 {
  93     if (timeout != 0) {
  94         volatile double deadline =
  95             timeout > 0 ? MSG_get_clock() + timeout : 0.0;
  96         xbt_mutex_acquire(mutex);
  97         while (received.empty() && (!deadline || deadline > MSG_get_clock())) {
  98             xbt_ex_t e;
  99             XBT_DEBUG("waiting for a message to come");
 100             TRY {
 101                 if (deadline)
 102                     xbt_cond_timedwait(cond, mutex, deadline - MSG_get_clock());
 103                 else
 104                     xbt_cond_wait(cond, mutex);
 105             }
 106             CATCH (e) {
 107                 if (e.category != timeout_error)
 108                     RETHROW;
 109                 xbt_ex_free(e);
 110             }
 111         }
 112         xbt_mutex_release(mutex);
 113     }
 114
 115     if (received.empty())
 116         return false;
 117
 118     m_task_t task = received.front();
 119     received.pop();
 120     msg = static_cast<message*>(MSG_task_get_data(task));
 121     from = MSG_task_get_source(task);
 122     MSG_task_destroy(task);
 123
 124     XBT_DEBUG("received %s from %s",
 125            msg->to_string().c_str(), MSG_host_get_name(from));
 126
 127     return true;
 128 }
 129
 130 void communicator::flush(bool wait)
 131 {
 132     sent_comm.remove_if(comm_test_n_destroy);
 133     if (wait && !sent_comm.empty()) {
 134         msg_comm_t comms[sent_comm.size()];
 135         std::copy(sent_comm.begin(), sent_comm.end(), comms);
 136         MSG_comm_waitall(comms, sent_comm.size(), -1.0);
 137         if (!MSG_WAIT_DESTROYS_COMMS)
 138             std::for_each(sent_comm.begin(), sent_comm.end(), MSG_comm_destroy);
 139         sent_comm.clear();
 140     }
 141 }
 142
 143 bool communicator::comm_test_n_destroy(msg_comm_t comm)
 144 {
 145     if (MSG_comm_test(comm)) {
 146         MSG_comm_destroy(comm);
 147         return true;
 148     } else
 149         return false;
 150 }
 151
 152 int communicator::receiver_wrapper(int, char* [])
 153 {
 154     communicator* comm;
 155     comm = static_cast<communicator*>(MSG_process_get_data(MSG_process_self()));
 156     int result = comm->receiver();
 157
 158     XBT_DEBUG("terminate");
 159     xbt_mutex_acquire(comm->mutex);
 160     comm->receiver_process = NULL;
 161     xbt_cond_signal(comm->cond);
 162     xbt_mutex_release(comm->mutex);
 163
 164     return result;
 165 }
 166
 167 void communicator::receiver1(msg_comm_t& comm, m_task_t& task, const char* mbox)
 168 {
 169     MSG_comm_destroy(comm);
 170     if (strcmp(MSG_task_get_name(task), "finalize")) {
 171         XBT_DEBUG("received message on %s", mbox);
 172         xbt_mutex_acquire(mutex);
 173         received.push(task);
 174         xbt_cond_signal(cond);
 175         xbt_mutex_release(mutex);
 176         task = NULL;
 177         comm = MSG_task_irecv(&task, mbox);
 178     } else {
 179         XBT_DEBUG("received finalize on %s", mbox);
 180         MSG_task_destroy(task);
 181         task = NULL;
 182         comm = NULL;
 183     }
 184 }
 185
 186 int communicator::receiver()
 187 {
 188     ctrl_comm = MSG_task_irecv(&ctrl_task, get_ctrl_mbox());
 189     data_comm = MSG_task_irecv(&data_task, get_data_mbox());
 190     XBT_DEBUG("receiver ready");
 191     xbt_mutex_acquire(mutex);
 192     xbt_cond_signal(cond);      // signal master that we are ready
 193     xbt_mutex_release(mutex);
 194
 195     xbt_dynar_t comms = xbt_dynar_new(sizeof(msg_comm_t), NULL);
 196     while (ctrl_comm || data_comm) {
 197
 198         if (ctrl_comm)
 199             xbt_dynar_push(comms, &ctrl_comm);
 200         if (data_comm)
 201             xbt_dynar_push(comms, &data_comm);
 202         int recvd = MSG_comm_waitany(comms);
 203         msg_comm_t comm = xbt_dynar_get_as(comms, recvd, msg_comm_t);
 204         xbt_dynar_reset(comms);
 205
 206         if (comm == ctrl_comm)
 207             receiver1(ctrl_comm, ctrl_task, get_ctrl_mbox());
 208         else if (comm == data_comm)
 209             receiver1(data_comm, data_task, get_data_mbox());
 210         else {
 211             XBT_ERROR("Handling unknown comm -- %p", comm);
 212             MSG_comm_destroy(comm);
 213         }
 214     }
 215     xbt_dynar_free(&comms);
 216     return 0;
 217 }
 218
 219 // Local variables:
 220 // mode: c++
 221 // End: