> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/connectors/mariadb-connector-c/api-functions/mysql_thread_init.md).

# mysql\_thread\_init

## Syntax

```c
my_bool mysql_thread_init(void );
```

## Description

Thread initialization for multi-threaded clients. Multi-threaded clients should call `mysql_thread_init()` at the beginning of the thread initialization to initialize thread specific client library variables. If <sub>`mysql_thread_init()`</sub> was not called explicitly, it will be called automatically by [mysql\_init()](/docs/connectors/mariadb-connector-c/api-functions/mysql_init.md) or [mysql\_real\_connect()](/docs/connectors/mariadb-connector-c/api-functions/mysql_real_connect.md).

## Return Value

Returns zero if successful or 1 if an error occurred.

{% hint style="info" %}
Before a client thread ends the [mysql\_thread\_end()](/docs/connectors/mariadb-connector-c/api-functions/mysql_thread_end.md) function must be called to release memory - otherwise the client library will report an error.
{% endhint %}

{% hint style="warning" %}
This function has been deprecated since MariaDB Connector/C 3.0.0.
{% endhint %}

## See Also

* [mysql\_thread\_end()](/docs/connectors/mariadb-connector-c/api-functions/mysql_thread_end.md)
* [mysql\_thread\_safe()](/docs/connectors/mariadb-connector-c/api-functions/mysql_thread_safe.md)

{% @marketo/form formId="4316" %}


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