syncManager.h

// Copyright 2009-2021 NTESS. Under the terms
// of Contract DE-NA0003525 with NTESS, the U.S.
// Government retains certain rights in this software.
//
// Copyright (c) 2009-2021, NTESS
// All rights reserved.
//
// This file is part of the SST software package. For license
// information, see the LICENSE file in the top level directory of the
// distribution.

#ifndef SST_CORE_SYNC_SYNCMANAGER_H
#define SST_CORE_SYNC_SYNCMANAGER_H

#include "sst/core/action.h"
#include "sst/core/link.h"
#include "sst/core/rankInfo.h"
#include "sst/core/sst_types.h"
#include "sst/core/threadsafe.h"

#include <unordered_map>
#include <vector>

namespace SST {

class Exit;
class Simulation_impl;
// class SyncBase;
class ThreadSyncQueue;
class TimeConverter;

class RankSync
{
public:
    RankSync() {}
    virtual ~RankSync() {}

    /** Register a Link which this Sync Object is responsible for */
    virtual ActivityQueue*
    registerLink(const RankInfo& to_rank, const RankInfo& from_rank, LinkId_t link_id, Link* link) = 0;

    virtual void execute(int thread)                                              = 0;
    virtual void exchangeLinkUntimedData(int thread, std::atomic<int>& msg_count) = 0;
    virtual void finalizeLinkConfigurations()                                     = 0;
    virtual void prepareForComplete()                                             = 0;

    virtual SimTime_t getNextSyncTime() { return nextSyncTime; }

    // void setMaxPeriod(TimeConverter* period) {max_period = period;}
    TimeConverter* getMaxPeriod() { return max_period; }

    virtual uint64_t getDataSize() const = 0;

protected:
    SimTime_t      nextSyncTime;
    TimeConverter* max_period;

    void finalizeConfiguration(Link* link) { link->finalizeConfiguration(); }

    void prepareForCompleteInt(Link* link) { link->prepareForComplete(); }

    void sendUntimedData_sync(Link* link, Event* data) { link->sendUntimedData_sync(data); }

private:
};

class ThreadSync
{
public:
    ThreadSync() {}
    virtual ~ThreadSync() {}

    virtual void before()                     = 0;
    virtual void after()                      = 0;
    virtual void execute()                    = 0;
    virtual void processLinkUntimedData()     = 0;
    virtual void finalizeLinkConfigurations() = 0;
    virtual void prepareForComplete()         = 0;

    virtual SimTime_t getNextSyncTime() { return nextSyncTime; }

    void           setMaxPeriod(TimeConverter* period) { max_period = period; }
    TimeConverter* getMaxPeriod() { return max_period; }

    /** Register a Link which this Sync Object is responsible for */
    virtual void           registerLink(LinkId_t link_id, Link* link) = 0;
    virtual ActivityQueue* getQueueForThread(int tid)                 = 0;

protected:
    SimTime_t      nextSyncTime;
    TimeConverter* max_period;

    void finalizeConfiguration(Link* link) { link->finalizeConfiguration(); }

    void prepareForCompleteInt(Link* link) { link->prepareForComplete(); }

    void sendUntimedData_sync(Link* link, Event* data) { link->sendUntimedData_sync(data); }

private:
};

class SyncManager : public Action
{
public:
    SyncManager(
        const RankInfo& rank, const RankInfo& num_ranks, TimeConverter* minPartTC, SimTime_t min_part,
        const std::vector<SimTime_t>& interThreadLatencies);
    virtual ~SyncManager();

    /** Register a Link which this Sync Object is responsible for */
    ActivityQueue* registerLink(const RankInfo& to_rank, const RankInfo& from_rank, LinkId_t link_id, Link* link);
    void           execute(void) override;

    /** Cause an exchange of Initialization Data to occur */
    void exchangeLinkUntimedData(std::atomic<int>& msg_count);
    /** Finish link configuration */
    void finalizeLinkConfigurations();
    void prepareForComplete();

    void print(const std::string& header, Output& out) const override;

    uint64_t getDataSize() const;

private:
    enum sync_type_t { RANK, THREAD };

    RankInfo                         rank;
    RankInfo                         num_ranks;
    static Core::ThreadSafe::Barrier RankExecBarrier[6];
    static Core::ThreadSafe::Barrier LinkUntimedBarrier[3];
    // static SimTime_t min_next_time;
    // static int min_count;

    static RankSync* rankSync;
    static SimTime_t next_rankSync;
    ThreadSync*      threadSync;
    Exit*            exit;
    Simulation_impl* sim;

    sync_type_t next_sync_type;
    SimTime_t   min_part;

    void computeNextInsert();

    NotSerializable(SST::SyncManager)
};

} // namespace SST

#endif // SST_CORE_SYNC_SYNCMANAGER_H