---
name: "garbagebddsystem"
section: "3"
platform: "linux"
package: "alliance"
version: "5.1.1-3"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/garbagebddsystem"
---

# garbagebddsystem(3)

Forces a bdd garbage collection.

## NAME

garbagebddsystem - Forces a **bdd** garbage collection.

## SYNOPSYS

```
#include "bdd101.h"
void garbagebddsystem( BddSystem )
  bddsystem ∗BddSystem;
```

## PARAMETERS

- *BddSystem*

  The **bdd** system.

## DESCRIPTION

**garbagebddsystem** frees all the unused **bdd** nodes in the  system *BddSystem*. If a null pointer is given, the default **bdd** system is used. A **bdd** node is unused if its number of reference is null.\

## RETURN VALUE

**garbagebddsystem** returns nothing.

## EXAMPLE

```
#include "bdd101.h"
   bddsystem  ∗BddSystem;
   bddcircuit ∗BddCircuit;
   bddnode    ∗BddNode;
   chain_list ∗Expr;
   BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
   BddCircuit = createbddcircuit( "hello_world", 10, 10, BddSystem );
   addbddcircuitin( (bddcircuit ∗)0, "i0", 0, BDD_IN_MODE_FIRST );
   addbddcircuitin( (bddcircuit ∗)0, "i1", 0, BDD_IN_MODE_FIRST );
   BddNode = applybddnode( (bddsystem ∗)0,
                           ABL_AND,
                           searchbddcircuitin( (bddcircuit ∗)0, "i0" ),
                           searchbddcircuitin( (bddcircuit ∗)0, "i1" ) );
   decbddrefext( BddNode );
   garbagebddsystem( (bddsystem ∗)0 );
   destroybddsystem( (bddsystem ∗)0 );
   destroybddcircuit( (bddcircuit ∗)0 );
```

## SEE ALSO

[**bdd**(1)](/bdd/1.md)