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