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# AOInitializePackage
This function initializes everything in the `AO` package. It is called from `PetscDLLibraryRegister_petscvec()` when using dynamic libraries, and on the first call to `AOCreate()` when using static or shared libraries. 
## Synopsis
```
PetscErrorCode AOInitializePackage(void)
```



## See Also
 `AOFinalizePackage()`, `PetscInitialize()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/is/ao/interface/dlregisdm.c.html#AOInitializePackage">src/vec/is/ao/interface/dlregisdm.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/vec/is/ao/interface/dlregisdm.c)


[Index of all AO routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)