[#ASYNC_stack_alloc_fn]
= ASYNC_stack_alloc_fn
:mrdocs:

Allocate a stack for an asynchronous job (POSIX custom stack allocator).

== Synopsis

Declared in `<openssl/async.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef void*(* ASYNC_stack_alloc_fn)(size_t*);
----

== Return Value

Pointer to the allocated stack base, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *num*
| On entry, requested stack size in bytes; on return, actual size of the allocated stack.
|===


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