* Threaded operation requires locking callbacks
 * Based from /crypto/cryptlib.c of OpenSSL and NSOpenSSL.
 */

static Tcl_Mutex *locks = NULL;
static Tcl_Mutex init_mx;

static void          CryptoThreadLockCallback(int mode, int n, const char *file, int line);
static unsigned long CryptoThreadIdCallback(void);

static void CryptoThreadLockCallback(int mode, int n, const char *file, int line) {
void CryptoThreadLockCallback(int mode, int n, const char *file, int line) {
	if (mode & CRYPTO_LOCK) {
		Tcl_MutexLock(&locks[n]);
	} else {
		Tcl_MutexUnlock(&locks[n]);
	}
}

static unsigned long CryptoThreadIdCallback(void) {
unsigned long CryptoThreadIdCallback(void) {
	return (unsigned long) Tcl_GetCurrentThread();
}
#endif /* OPENSSL_THREADS */
#endif /* TCL_THREADS */


/*

		if (!initialized) {
			dprintf("Asked to uninitialize, but we are not initialized");

			return(TCL_OK);
		}

		dprintf("Asked to uninitialize");

#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
		Tcl_MutexLock(&init_mx);

		CRYPTO_set_locking_callback(NULL);
		CRYPTO_set_id_callback(NULL);

		if (locks) {

		return(TCL_OK);
	}

	if (initialized) {
		return(status);
	}

#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
	Tcl_MutexLock(&init_mx);
#endif
	initialized = 1;

#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
	Tcl_MutexLock(&init_mx);

	num_locks = CRYPTO_num_locks();
	locks = malloc(sizeof(*locks) * num_locks);

	CRYPTO_set_locking_callback(CryptoThreadLockCallback);
	CRYPTO_set_id_callback(CryptoThreadIdCallback);
#endif