hvirtual/cinelerra/garbage.C

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#include "bcsignals.h"
#include "garbage.h"
#include "mutex.h"

#include <string.h>

Garbage *Garbage::garbage = 0;


GarbageObject::GarbageObject(char *title)
{
        Garbage::garbage->add_object(this);
        users = 0;
        deleted = 0;
        this->title = new char[strlen(title) + 1];
        strcpy(this->title, title);
}

GarbageObject::~GarbageObject()
{
        if(!deleted) 
                printf("GarbageObject::~GarbageObject: title=%s users=%d was not deleted by Garbage::delete_object\n", title, users);
        delete [] title;
}


void GarbageObject::add_user()
{
        Garbage::garbage->lock->lock("GarbageObject::add_user");
        users++;
        Garbage::garbage->lock->unlock();
}

void GarbageObject::remove_user()
{
        Garbage::garbage->lock->lock("GarbageObject::add_user");
        users--;
        if(users < 0) printf("GarbageObject::remove_user: users=%d Should be >= 0.\n", users);
        Garbage::garbage->remove_expired();
// *this is now invalid
        Garbage::garbage->lock->unlock();
}





Garbage::Garbage()
{
        lock = new Mutex("Garbage::lock", 1);
}


Garbage::~Garbage()
{
        delete lock;
}

void Garbage::add_object(GarbageObject *ptr)
{
        lock->lock("Garbage::add_object");
        objects.append(ptr);
        lock->unlock();
}

void Garbage::delete_object(GarbageObject *ptr)
{
        Garbage *garbage = Garbage::garbage;
        garbage->lock->lock("Garbage::delete_object");
        ptr->deleted = 1;

// Remove expired objects here
        remove_expired();
        garbage->lock->unlock();
}

void Garbage::remove_expired()
{
        Garbage *garbage = Garbage::garbage;
        for(int i = 0; i < garbage->objects.total; i++)
        {
                GarbageObject *ptr = garbage->objects.values[i];
                if(ptr->users <= 0 && ptr->deleted)
                {
// Must remove pointer to prevent recursive deletion of the same object.
// But i is still invalid.
                        garbage->objects.remove_number(i);

                        delete ptr;
                        i--;
                }
        }
}

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