[#CRYPTO_THREAD_init_local]
= CRYPTO_THREAD_init_local
:mrdocs:

Allocate a thread‐local storage key for use with CRYPTO_THREAD_get/set_local().

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CRYPTO_THREAD_init_local(
    xref:CRYPTO_THREAD_LOCAL.adoc[CRYPTO_THREAD_LOCAL]* key,
    void(* cleanup)(void*));
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Receives the new key on success.
| *cleanup*
| Optional destructor invoked on thread exit for non‐NULL values, or NULL.
|===


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