[#CRYPTO_ONCE]
= CRYPTO_ONCE
:mrdocs:

Once‐control type used with CRYPTO_THREAD_run_once() on POSIX builds.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef pthread_once_t CRYPTO_ONCE;
----


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