---
title: "sec_protocol_options_set_pre_shared_key_selection_block(_:_:_:)"
framework: security
role: symbol
role_heading: Function
path: "security/sec_protocol_options_set_pre_shared_key_selection_block(_:_:_:)"
---

# sec_protocol_options_set_pre_shared_key_selection_block(_:_:_:)

## Declaration

```swift
func sec_protocol_options_set_pre_shared_key_selection_block(_ options: sec_protocol_options_t, _ psk_selection_block: @escaping sec_protocol_pre_shared_key_selection_t, _ psk_selection_queue: dispatch_queue_t)
```

## Parameters

- `options`: A sec_protocol_options_t instance.
- `psk_selection_block`: A sec_protocol_pre_shared_key_selection_t block.

## Discussion

Discussion Set the PSK selection block.  A `dispatch_queue_t` on which the PSK selection block should be called.