*/
MDB_dbi mt_numdbs;
+/** @defgroup mdb_txn Transaction Flags
+ * @ingroup internal
+ * @{
+ */
#define MDB_TXN_RDONLY 0x01 /**< read-only transaction */
#define MDB_TXN_ERROR 0x02 /**< an error has occurred */
- unsigned int mt_flags;
+/** @} */
+ unsigned int mt_flags; /**< @ref mdb_txn */
/** Tracks which of the two meta pages was used at the start
* of this transaction.
*/
}
#endif
}
+#if defined(_WIN32) || defined(__APPLE__)
+/*
+ * hash_64 - 64 bit Fowler/Noll/Vo-0 FNV-1a hash code
+ *
+ * @(#) $Revision: 5.1 $
+ * @(#) $Id: hash_64a.c,v 5.1 2009/06/30 09:01:38 chongo Exp $
+ * @(#) $Source: /usr/local/src/cmd/fnv/RCS/hash_64a.c,v $
+ *
+ * http://www.isthe.com/chongo/tech/comp/fnv/index.html
+ *
+ ***
+ *
+ * Please do not copyright this code. This code is in the public domain.
+ *
+ * LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
+ * EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ *
+ * By:
+ * chongo <Landon Curt Noll> /\oo/\
+ * http://www.isthe.com/chongo/
+ *
+ * Share and Enjoy! :-)
+ */
+
+typedef unsigned long long mdb_hash_t;
+#define MDB_HASH_INIT ((mdb_hash_t)0xcbf29ce484222325ULL)
+
+/** perform a 64 bit Fowler/Noll/Vo FNV-1a hash on a buffer
+ * @param[in] str string to hash
+ * @param[in] hval initial value for hash
+ * @return 64 bit hash
+ *
+ * NOTE: To use the recommended 64 bit FNV-1a hash, use MDB_HASH_INIT as the
+ * hval arg on the first call.
+ */
+static inline mdb_hash_t
+mdb_hash_str(char *str, mdb_hash_t hval)
+{
+ unsigned char *s = (unsigned char *)str; /* unsigned string */
+ /*
+ * FNV-1a hash each octet of the string
+ */
+ while (*s) {
+ /* xor the bottom with the current octet */
+ hval ^= (mdb_hash_t)*s++;
+
+ /* multiply by the 64 bit FNV magic prime mod 2^64 */
+ hval += (hval << 1) + (hval << 4) + (hval << 5) +
+ (hval << 7) + (hval << 8) + (hval << 40);
+ }
+ /* return our new hash value */
+ return hval;
+}
+
+/** Hash the string and output the hash in hex.
+ * @param[in] str string to hash
+ * @param[out] hexbuf an array of 17 chars to hold the hash
+ */
+static void
+mdb_hash_hex(char *str, char *hexbuf)
+{
+ int i;
+ mdb_hash_t h = mdb_hash_str(str, MDB_HASH_INIT);
+ for (i=0; i<8; i++) {
+ hexbuf += sprintf(hexbuf, "%02x", (unsigned int)h & 0xff);
+ h >>= 8;
+ }
+}
+#endif
/** Open and/or initialize the lock region for the environment.
* @param[in] env The MDB environment.
#endif
if (*excl) {
#ifdef _WIN32
- char *ptr;
+ char hexbuf[17];
if (!mdb_sec_inited) {
InitializeSecurityDescriptor(&mdb_null_sd,
SECURITY_DESCRIPTOR_REVISION);
mdb_all_sa.lpSecurityDescriptor = &mdb_null_sd;
mdb_sec_inited = 1;
}
- /* FIXME: only using up to 20 characters of the env path here,
- * probably not enough to assure uniqueness...
- */
- sprintf(env->me_txns->mti_rmname, "Global\\MDBr%.20s", lpath);
- ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBr")-1;
- while ((ptr = strchr(ptr, '\\')))
- *ptr++ = '/';
+ mdb_hash_hex(lpath, hexbuf);
+ sprintf(env->me_txns->mti_rmname, "Global\\MDBr%s", hexbuf);
env->me_rmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
if (!env->me_rmutex) {
rc = ErrCode();
goto fail;
}
- sprintf(env->me_txns->mti_wmname, "Global\\MDBw%.20s", lpath);
- ptr = env->me_txns->mti_wmname + sizeof("Global\\MDBw")-1;
- while ((ptr = strchr(ptr, '\\')))
- *ptr++ = '/';
+ sprintf(env->me_txns->mti_wmname, "Global\\MDBw%s", hexbuf);
env->me_wmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_wmname);
if (!env->me_wmutex) {
rc = ErrCode();
}
#else /* _WIN32 */
#ifdef __APPLE__
- char *ptr;
- sprintf(env->me_txns->mti_rmname, "MDBr%.26s", lpath);
- ptr = env->me_txns->mti_rmname + sizeof("MDBr")-1;
- while ((ptr = strchr(ptr, '/')))
- *ptr++ = '_';
+ char hexbuf[17];
+ mdb_hash_hex(lpath, hexbuf);
+ sprintf(env->me_txns->mti_rmname, "MDBr%s", hexbuf);
if (sem_unlink(env->me_txns->mti_rmname)) {
rc = ErrCode();
if (rc != ENOENT && rc != EINVAL)
rc = ErrCode();
goto fail;
}
- sprintf(env->me_txns->mti_wmname, "MDBw%.26s", lpath);
- ptr = env->me_txns->mti_wmname + sizeof("MDBw")-1;
- while ((ptr = strchr(ptr, '/')))
- *ptr++ = '_';
+ sprintf(env->me_txns->mti_wmname, "MDBw%s", hexbuf);
if (sem_unlink(env->me_txns->mti_wmname)) {
rc = ErrCode();
if (rc != ENOENT && rc != EINVAL)
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