source: libcfa/src/bits/multi_list.cfa @ 3c6480b7

#include <fstream.hfa>
#include <stdlib.hfa>
#include "sequence.hfa"
#include "queue.hfa"
#include "stack.hfa"

struct Task;                                                                                    // node type

struct TaskDL {
        inline Seqable;
        Task & node;
};
void ?{}( TaskDL & this, Task & task ) with( this ) {
        ((Seqable &)this){};
        &node = &task;                                                                          // pointer to containing node
}
Task & task( TaskDL & this ) with( this ) {                             // getter routine for containing node
        return node;
}

struct TaskSL {
        inline Colable;
        Task & node;
};
void ?{}( TaskSL & this, Task & task ) with( this ) {
        ((Colable &)this){};
        &node = &task;                                                                          // pointer to containing node
}
Task & task( TaskSL & this ) with( this ) {                             // getter routine for containing node
        return node;
}

struct Task {
        TaskDL clusterRef;                                                                      // list of tasks on cluster
        TaskDL readyRef;                                                                        // list of tasks on ready queue
        TaskSL mutexRef;                                                                        // list of tasks on mutex queue
        int id;
};
void ?{}( Task & this, int id ) with( this ) {
        ((TaskDL &)clusterRef){ this };
        ((TaskDL &)readyRef){ this };
        ((TaskSL &)mutexRef){ this };
        this.id = id;
}

int main() {
        Sequence(TaskDL) clustList, readyList;                          // task lists
        Queue(TaskSL) mutexList;
        enum { Lnth = 10 };

        for ( id; Lnth ) {
                Task & task = *new( id );                                               // create task node
                addHead( clustList, task.clusterRef );                  // insert on lists in opposite directions
                addTail( readyList, task.readyRef );
                addHead( mutexList, task.mutexRef );
        }

        SeqIter(TaskDL) sqiter;
        TaskDL & dl;
        TaskSL & sl;

        sout | nlOff;
        for ( over( sqiter, clustList ); sqiter >> dl; ) {      // print lists
                Task & tmp = task( dl ); sout | tmp.id;
                // sout | task( dl ).id;
        }
        sout | nl;
        for ( over( sqiter, readyList ); sqiter >> dl; ) {
                Task & tmp = task( dl ); sout | tmp.id;
                // sout | task( dl ).id;
        }
        sout | nl;
        for ( QueueIter(TaskSL) qiter = { mutexList }; qiter >> sl; ) { // print lists
                Task & tmp = task( sl ); sout | tmp.id;
                // sout | task( sl ).id;
        }
        sout | nl;
        for ( Lnth ) {                                                                          // remove nodes from clustList. mutexList
                dropHead( clustList );
                drop( mutexList );
        }
        // Simultaneous deletion only safe if all nodes are traversed in same direction.
        for ( Lnth ) {                                                                          // remove nodes from readyList and safe to delete nodes
                delete( &task( dropHead( readyList ) ) );
        }

        // Re-purpose Seqable as Colable
        Stack(TaskDL) mutexStack;
        for ( id; Lnth ) {
                Task & task = *new( id );                                               // create task node
                push( mutexStack, task.clusterRef );                    // insert on lists in opposite directions
        }
        for ( StackIter(TaskDL) stiter = { mutexStack }; stiter >> dl; ) {
                Task & tmp = task( dl ); sout | tmp.id;
                // sout | task( dl ).id;
        }
        sout | nl;
        for ( Lnth ) {                                                                          // remove nodes from readyList and safe to delete nodes
                delete( &task( pop( mutexStack ) ) );
        }
}