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           CRYPTO_THREADID_hash, CRYPTO_set_locking_callback, CRYPTO_num_locks,
           CRYPTO_set_dynlock_create_callback, CRYPTO_set_dynlock_lock_callback,
           CRYPTO_set_dynlock_destroy_callback, CRYPTO_get_new_dynlockid,
           CRYPTO_destroy_dynlockid, CRYPTO_lock - OpenSSL thread support


            #include <openssl/crypto.h>
            /* Don't use this structure directly. */
            typedef struct crypto_threadid_st
                    void *ptr;
                    unsigned long val;
                    } CRYPTO_THREADID;
            /* Only use CRYPTO_THREADID_set_[numeric|pointer]() within callbacks */
            void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id, unsigned long val);
            void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr);
            int CRYPTO_THREADID_set_callback(void (*threadid_func)(CRYPTO_THREADID *));
            void (*CRYPTO_THREADID_get_callback(void))(CRYPTO_THREADID *);
            void CRYPTO_THREADID_current(CRYPTO_THREADID *id);
            int CRYPTO_THREADID_cmp(const CRYPTO_THREADID *a,
                                    const CRYPTO_THREADID *b);
            void CRYPTO_THREADID_cpy(CRYPTO_THREADID *dest,
                                     const CRYPTO_THREADID *src);
            unsigned long CRYPTO_THREADID_hash(const CRYPTO_THREADID *id);
            int CRYPTO_num_locks(void);
            /* struct CRYPTO_dynlock_value needs to be defined by the user */
            struct CRYPTO_dynlock_value;
            void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *
                   (*dyn_create_function)(char *file, int line));
            void CRYPTO_set_dynlock_lock_callback(void (*dyn_lock_function)
                   (int mode, struct CRYPTO_dynlock_value *l,
                   const char *file, int line));
            void CRYPTO_set_dynlock_destroy_callback(void (*dyn_destroy_function)
                   (struct CRYPTO_dynlock_value *l, const char *file, int line));
            int CRYPTO_get_new_dynlockid(void);
            void CRYPTO_destroy_dynlockid(int i);
            void CRYPTO_lock(int mode, int n, const char *file, int line);
            #define CRYPTO_w_lock(type)    \
            #define CRYPTO_w_unlock(type)  \
            #define CRYPTO_r_lock(type)    \
            #define CRYPTO_r_unlock(type)  \
           locking_function() must be able to handle up to CRYPTO_num_locks()
           different mutex locks. It sets the n-th lock if mode & CRYPTO_LOCK, and
           releases it otherwise.
           file and line are the file number of the function setting the lock.
           They can be useful for debugging.
           threadid_func(CRYPTO_THREADID *id) is needed to record the currently-
           executing thread's identifier into id. The implementation of this
           callback should not fill in id directly, but should use
           CRYPTO_THREADID_set_numeric() if thread IDs are numeric, or
           CRYPTO_THREADID_set_pointer() if they are pointer-based.  If the
           application does not register such a callback using
           CRYPTO_THREADID_set_callback(), then a default implementation is used -
           on Windows and BeOS this uses the system's default thread identifying
           APIs, and on all other platforms it uses the address of errno. The
           latter is satisfactory for thread-safety if and only if the platform
           has a thread-local error number facility.
           Once threadid_func() is registered, or if the built-in default
           implementation is to be used;
           ?   CRYPTO_THREADID_current() records the currently-executing thread ID
               into the given id object.
           ?   CRYPTO_THREADID_cmp() compares two thread IDs (returning zero for
               equality, ie.  the same semantics as memcmp()).
           ?   CRYPTO_THREADID_cpy() duplicates a thread ID value,
           ?   CRYPTO_THREADID_hash() returns a numeric value usable as a hash-
               table key. This is usually the exact numeric or pointer-based
               thread ID used internally, however this also handles the unusual
               case where pointers are larger than 'long' variables and the
               platform's thread IDs are pointer-based - in this case, mixing is
               done to attempt to produce a unique numeric value even though it is
               not as wide as the platform's true thread IDs.
           Additionally, OpenSSL supports dynamic locks, and sometimes, some parts
           of OpenSSL need it for better performance.  To enable this, the
           following is required:
           ?   Three additional callback function, dyn_create_function,
               dyn_lock_function and dyn_destroy_function.
           ?   A structure defined with the data that each lock needs to handle.
           struct CRYPTO_dynlock_value has to be defined to contain whatever
           structure is needed to handle locks.
           dyn_create_function(const char *file, int line) is needed to create a
           CRYPTO_destroy_dynlockid() is used to destroy locks.  It will call
           dyn_destroy_function for the actual destruction.
           CRYPTO_lock() is used to lock and unlock the locks.  mode is a bitfield
           describing what should be done with the lock.  n is the number of the
           lock as returned from CRYPTO_get_new_dynlockid().  mode can be combined
           from the following values.  These values are pairwise exclusive, with
           undefined behaviour if misused (for example, CRYPTO_READ and
           CRYPTO_WRITE should not be used together):
                   CRYPTO_LOCK     0x01
                   CRYPTO_UNLOCK   0x02
                   CRYPTO_READ     0x04
                   CRYPTO_WRITE    0x08


           CRYPTO_num_locks() returns the required number of locks.
           CRYPTO_get_new_dynlockid() returns the index to the newly created lock.
           The other functions return no values.


           You can find out if OpenSSL was configured with thread support:
            #define OPENSSL_THREAD_DEFINES
            #include <openssl/opensslconf.h>
            #if defined(OPENSSL_THREADS)
              // thread support enabled
              // no thread support
           Also, dynamic locks are currently not used internally by OpenSSL, but
           may do so in the future.


           crypto/threads/mttest.c shows examples of the callback functions on
           Solaris, Irix and Win32.


           CRYPTO_set_locking_callback() is available in all versions of SSLeay
           and OpenSSL.  CRYPTO_num_locks() was added in OpenSSL 0.9.4.  All
           functions dealing with dynamic locks were added in OpenSSL 0.9.5b-dev.
           CRYPTO_THREADID and associated functions were introduced in OpenSSL
           1.0.0 to replace (actually, deprecate) the previous
           CRYPTO_set_id_callback(), CRYPTO_get_id_callback(), and
           CRYPTO_thread_id() functions which assumed thread IDs to always be
           represented by 'unsigned long'.



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