---
title: "ClikaRT::runtime::StepSlot"
sidebar_label: "StepSlot"
description: "One session's slot within a batched Iterate step. session and priority let a model short of capacity pick which session to set aside without the runtime naming one: the youngest (highest session; ids…"
---

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<span class="api-kind api-kind--struct">struct</span>

**Header:** `ClikaRT/runtime/context.h`

One session's slot within a batched `Iterate` step. [`session`](./StepSlot.md#session) and [`priority`](./StepSlot.md#priority) let a model short of capacity pick which session to set aside without the runtime naming one: the youngest (highest [`session`](./StepSlot.md#session); ids are minted in arrival order) among the lowest [`priority`](./StepSlot.md#priority). See [`Disposition::Preempted`](./index.md#Disposition).

## Data members

### state {#state}

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[`ModelState`](./ModelState.md)`*` **`state`** `= nullptr`

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the session's own state (null for a stateless model)

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Declared in `ClikaRT/runtime/context.h`, line 59

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### session {#session}

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`std::uint64_t` **`session`** `= 0`

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the runtime's session id (arrival order)

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Declared in `ClikaRT/runtime/context.h`, line 60

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### priority {#priority}

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`std::int32_t` **`priority`** `= 0`

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the request's scheduling priority (higher runs sooner)

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Declared in `ClikaRT/runtime/context.h`, line 61

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