+void CRYPTO_set_add_lock_callback(int (*func) (int *num, int mount, int type,
+ const char *file, int line))
+{
+ add_lock_callback = func;
+}
+
+/*
+ * the memset() here and in set_pointer() seem overkill, but for the sake of
+ * CRYPTO_THREADID_cmp() this avoids any platform silliness that might cause
+ * two "equal" THREADID structs to not be memcmp()-identical.
+ */
+void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id, unsigned long val)
+{
+ memset(id, 0, sizeof(*id));
+ id->val = val;
+}
+
+static const unsigned char hash_coeffs[] = { 3, 5, 7, 11, 13, 17, 19, 23 };
+
+void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr)
+{
+ unsigned char *dest = (void *)&id->val;
+ unsigned int accum = 0;
+ unsigned char dnum = sizeof(id->val);
+
+ memset(id, 0, sizeof(*id));
+ id->ptr = ptr;
+ if (sizeof(id->val) >= sizeof(id->ptr)) {
+ /*
+ * 'ptr' can be embedded in 'val' without loss of uniqueness
+ */
+ id->val = (unsigned long)id->ptr;
+ return;
+ }
+ /*
+ * hash ptr ==> val. Each byte of 'val' gets the mod-256 total of a
+ * linear function over the bytes in 'ptr', the co-efficients of which
+ * are a sequence of low-primes (hash_coeffs is an 8-element cycle) - the
+ * starting prime for the sequence varies for each byte of 'val' (unique
+ * polynomials unless pointers are >64-bit). For added spice, the totals
+ * accumulate rather than restarting from zero, and the index of the
+ * 'val' byte is added each time (position dependence). If I was a
+ * black-belt, I'd scan big-endian pointers in reverse to give low-order
+ * bits more play, but this isn't crypto and I'd prefer nobody mistake it
+ * as such. Plus I'm lazy.
+ */
+ while (dnum--) {
+ const unsigned char *src = (void *)&id->ptr;
+ unsigned char snum = sizeof(id->ptr);
+ while (snum--)
+ accum += *(src++) * hash_coeffs[(snum + dnum) & 7];
+ accum += dnum;
+ *(dest++) = accum & 255;
+ }
+}
+
+#ifdef OPENSSL_FIPS
+extern int FIPS_crypto_threadid_set_callback(void (*func) (CRYPTO_THREADID *));
+#endif
+
+int CRYPTO_THREADID_set_callback(void (*func) (CRYPTO_THREADID *))
+{
+ if (threadid_callback)
+ return 0;
+ threadid_callback = func;
+#ifdef OPENSSL_FIPS
+ FIPS_crypto_threadid_set_callback(func);
+#endif
+ return 1;
+}
+
+void (*CRYPTO_THREADID_get_callback(void)) (CRYPTO_THREADID *) {
+ return threadid_callback;
+}