scheduler-map.cc

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#include "config.h"
#ifdef HAVE_STL

// Event Scheduler using the standard library std::set
// Contributed by George F. Riley, Georgia Tech.  Spring 2002

#include <stdio.h>
#include <set>

#include "scheduler.h"


class MapScheduler : public Scheduler {
public:
    MapScheduler();
    ~MapScheduler();
public:
    void cancel(Event*);
    void insert(Event*);
    Event* lookup(scheduler_uid_t uid);
    Event* deque();
    const Event *head() { return *EventQueue_.begin(); }
private:
    struct event_less_adapter {
        bool operator()(const Event *e1, const Event *e2) const
        {
            return e1->time_ < e2->time_ ||
                (e1->time_ == e2->time_ && e1->uid_ < e2->uid_); // for FIFO
        }
    };
    typedef set<Event *, event_less_adapter> EventQueue_t;
    EventQueue_t EventQueue_;   // The actual event list
};

static class MapSchedulerClass : public TclClass {
public:
    MapSchedulerClass() : TclClass("Scheduler/Map") {}
    TclObject* create(int /* argc */, const char*const* /* argv */) {
        return (new MapScheduler);
    }
} class_stl_sched;

MapScheduler::MapScheduler()
{
}

MapScheduler::~MapScheduler()
{
}

void MapScheduler::cancel(Event* p)
{
    EventQueue_t::iterator eIT = EventQueue_.find(p);
    if (eIT != EventQueue_.end()) {
        EventQueue_.erase(eIT);
        p->uid_ = -p->uid_; // Negate the uid for reuse
    }
}

void MapScheduler::insert(Event* p)
{
    EventQueue_.insert(p);
}

Event* MapScheduler::lookup(scheduler_uid_t uid) // look for event
{
    for (EventQueue_t::iterator eIT = EventQueue_.begin();
         eIT != EventQueue_.end(); 
         ++eIT) {
        if ((*eIT)->uid_ == uid) 
            return (*eIT);
    }

    return 0;
}

Event* MapScheduler::deque()
{
    EventQueue_t::iterator eIT = EventQueue_.begin();
    if (eIT == EventQueue_.end()) 
        return 0;

    EventQueue_.erase(eIT);

    return *eIT;
}

#endif // HAVE_STL

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