Help Needed for deprecated functions and macros like "CRYPTO_num_locks()" , "CRYPTO_LOCK" ......etc

[Kumar Mishra, Sanjeev]

Hi All,
I am upgrading the code from OpenSSL 1.0.1 to OpenSSL 3.0.
I am getting compilation errors for deprecated functions and macros like "CRYPTO_num_locks()" , "CRYPTO_LOCK" ......etc. But there is not any replacement for these functions and macros in OpenSSL 3.0.
How can I handle these compilation errors ?
Should I re-write these functions doing nothing and macros with any arbitrary numbers ?
In OpenSSL 3.0 source code file /include/openssl/crypto.h.in, it is mentioned that to handle these functions and macros as "no-ops".
Could anybody elaborate the following comment from source code of OpenSSL 3.0 ( /include/openssl/crypto.h.in) in details.......

/*
* The old locking functions have been removed completely without compatibility
* macros. This is because the old functions either could not properly report
* errors, or the returned error values were not clearly documented.
* Replacing the locking functions with no-ops would cause race condition
* issues in the affected applications. It is far better for them to fail at
* compile time.
* On the other hand, the locking callbacks are no longer used. Consequently,
* the callback management functions can be safely replaced with no-op macros.
*/
# define CRYPTO_num_locks() (1)
# define CRYPTO_set_locking_callback(func)
# define CRYPTO_get_locking_callback() (NULL)
# define CRYPTO_set_add_lock_callback(func)
# define CRYPTO_get_add_lock_callback() (NULL)
/*
* These defines where used in combination with the old locking callbacks,
* they are not called anymore, but old code that's not called might still
* use them.
*/
# define CRYPTO_LOCK 1
# define CRYPTO_UNLOCK 2
# define CRYPTO_READ 4
# define CRYPTO_WRITE 8
.....
.....
......

Thanks in anticipation,
Sanjeev Kumar Mishra


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