tCRYPTO_set_dynlock_lock_callback

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
alias tCRYPTO_set_dynlock_lock_callback = void function(void function(int mode, CRYPTO_dynlock_value* lock, const(char)* file, int lineNo) cb)

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