trick/trick_source/sim_services/VariableServer/VariableServerThread.cpp

#include <iostream>
#include <stdlib.h>
#include "trick/VariableServerThread.hh"
#include "trick/exec_proto.h"
#include "trick/TrickConstant.hh"

Trick::VariableServer * Trick::VariableServerThread::vs = NULL ;

Trick::VariableServerThread::VariableServerThread(ClientListener * in_listen_dev) :
 Trick::SysThread("VarServer") , debug(0),
 listener(in_listen_dev), session(NULL) {

    connection_status = CONNECTION_PENDING ;

    connection.initialize();

    pthread_mutex_init(&connection_status_mutex, NULL);
    pthread_cond_init(&connection_status_cv, NULL);

    pthread_mutex_init(&restart_pause, NULL);

}

Trick::VariableServerThread::~VariableServerThread() {}

std::ostream& Trick::operator<< (std::ostream& s, Trick::VariableServerThread& vst) {
    // Write a JSON representation of a Trick::VariableServerThread to an ostream.
    struct sockaddr_in otherside;
    socklen_t len = (socklen_t)sizeof(otherside);

    s << "  \"connection\":{\n";
    s << "    \"client_tag\":\"" << vst.connection.get_client_tag() << "\",\n";

    int err = getpeername(vst.connection.get_socket(), (struct sockaddr*)&otherside, &len);

    if (err == 0) {
        s << "    \"client_IP_address\":\"" << inet_ntoa(otherside.sin_addr) << "\",\n";
        s << "    \"client_port\":\"" << ntohs(otherside.sin_port) << "\",\n";
    } else {
        s << "    \"client_IP_address\":\"unknown\",\n";
        s << "    \"client_port\":\"unknown\",";
    }

    s << *(vst.session);

    s << "  }" << std::endl;
    return s;
}

void Trick::VariableServerThread::set_vs_ptr(Trick::VariableServer * in_vs) {
    vs = in_vs ;
}

Trick::VariableServer * Trick::VariableServerThread::get_vs() {
    return vs ;
}

void Trick::VariableServerThread::set_client_tag(std::string tag) {
    connection.set_client_tag(tag);
}

Trick::ConnectionStatus Trick::VariableServerThread::wait_for_accept() {

    pthread_mutex_lock(&connection_status_mutex);
    while ( connection_status == CONNECTION_PENDING ) {
        pthread_cond_wait(&connection_status_cv, &connection_status_mutex);
    }
    pthread_mutex_unlock(&connection_status_mutex);

    return connection_status;
}

// This should maybe go somewhere completely different
// Leaving it in thread for now
// Gets called from the main thread as a job
void Trick::VariableServerThread::preload_checkpoint() {

    // Stop variable server processing at the top of the processing loop.
    pthread_mutex_lock(&restart_pause);

    // Let the thread complete any data copying it has to do
    // and then suspend data copying until the checkpoint is reloaded.
    pthread_mutex_lock(&(session->copy_mutex));

    // Save the pause state of this thread.
    saved_pause_cmd = session->get_pause();

    // Disallow data writing.
    session->set_pause(true);

    // Temporarily "disconnect" the variable references from Trick Managed Memory
    // by tagging each as a "bad reference".
    session->disconnect_references();


    // Allow data copying to continue.
    pthread_mutex_unlock(&(session->copy_mutex));

}

// Gets called from the main thread as a job
void Trick::VariableServerThread::restart() {
    // Set the pause state of this thread back to its "pre-checkpoint reload" state.
    session->set_pause(saved_pause_cmd) ;

    // Restart the variable server processing.
    pthread_mutex_unlock(&restart_pause);
}