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(mozilla-projects-nss-reference-fc-cancelfunction)=
# FC_CancelFunction
## Name
:::{container}
FC_CancelFunction - cancel a function running in parallel
:::
## Syntax
:::{container}
```{code}
CK_RV FC_CancelFunction(
CK_SESSION_HANDLE hSession
);
```
:::
## Parameters
:::{container}
`hSession`
: [in] session handle.
:::
## Description
:::{container}
Parallel functions are not implemented. `FC_CancelFunction` is a legacy function that simply
returns `CKR_FUNCTION_NOT_PARALLEL`.
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## Return value
:::{container}
`FC_CancelFunction` always returns `CKR_FUNCTION_NOT_PARALLEL`.
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## Examples
## See also
:::{container}
- [NSC_CancelFunction](/en-US/NSC_CancelFunction)
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