cinelerra/garbage.C

   1 #include "bcsignals.h"
   2 #include "garbage.h"
   3 #include "mutex.h"
   4
   5 #include <string.h>
   6
   7 Garbage *Garbage::garbage = 0;
   8
   9
  10 GarbageObject::GarbageObject(char *title)
  11 {
  12         Garbage::garbage->add_object(this);
  13         users = 0;
  14         deleted = 0;
  15         this->title = new char[strlen(title) + 1];
  16         strcpy(this->title, title);
  17 }
  18
  19 GarbageObject::~GarbageObject()
  20 {
  21         if(!deleted)
  22                 printf("GarbageObject::~GarbageObject: title=%s users=%d was not deleted by Garbage::delete_object\n", title, users);
  23         delete [] title;
  24 }
  25
  26
  27 void GarbageObject::add_user()
  28 {
  29         Garbage::garbage->lock->lock("GarbageObject::add_user");
  30         users++;
  31         Garbage::garbage->lock->unlock();
  32 }
  33
  34 void GarbageObject::remove_user()
  35 {
  36         Garbage::garbage->lock->lock("GarbageObject::add_user");
  37         users--;
  38         if(users < 0) printf("GarbageObject::remove_user: users=%d Should be >= 0.\n", users);
  39         Garbage::garbage->remove_expired();
  40 // *this is now invalid
  41         Garbage::garbage->lock->unlock();
  42 }
  43
  44
  45
  46
  47
  48 Garbage::Garbage()
  49 {
  50         lock = new Mutex("Garbage::lock", 1);
  51 }
  52
  53
  54 Garbage::~Garbage()
  55 {
  56         delete lock;
  57 }
  58
  59 void Garbage::add_object(GarbageObject *ptr)
  60 {
  61         lock->lock("Garbage::add_object");
  62         objects.append(ptr);
  63         lock->unlock();
  64 }
  65
  66 void Garbage::delete_object(GarbageObject *ptr)
  67 {
  68         Garbage *garbage = Garbage::garbage;
  69         garbage->lock->lock("Garbage::delete_object");
  70         ptr->deleted = 1;
  71
  72 // Remove expired objects here
  73         remove_expired();
  74         garbage->lock->unlock();
  75 }
  76
  77 void Garbage::remove_expired()
  78 {
  79         Garbage *garbage = Garbage::garbage;
  80         for(int i = 0; i < garbage->objects.total; i++)
  81         {
  82                 GarbageObject *ptr = garbage->objects.values[i];
  83                 if(ptr->users <= 0 && ptr->deleted)
  84                 {
  85 // Must remove pointer to prevent recursive deletion of the same object.
  86 // But i is still invalid.
  87                         garbage->objects.remove_number(i);
  88
  89                         delete ptr;
  90                         i--;
  91                 }
  92         }
  93 }
  94
  95
  96