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Refactor mdb_midl_append, add mdb_midl_grow()

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This commit is contained in:
Howard Chu 2013-05-09 17:27:29 -07:00
parent 2d6aed7537
commit 66c839f029
3 changed files with 36 additions and 24 deletions
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4
libraries/liblmdb/mdb.c
View File

@ -1941,7 +1941,7 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
unsigned int i;
txn->mt_u.dirty_list = malloc(sizeof(MDB_ID2)*MDB_IDL_UM_SIZE);
if (!txn->mt_u.dirty_list ||
!(txn->mt_free_pgs = mdb_midl_alloc()))
!(txn->mt_free_pgs = mdb_midl_alloc(MDB_IDL_UM_MAX)))
{
free(txn->mt_u.dirty_list);
free(txn);
@ -3472,7 +3472,7 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode
/* silently ignore WRITEMAP when we're only getting read access */
flags &= ~MDB_WRITEMAP;
} else {
if (!((env->me_free_pgs = mdb_midl_alloc()) &&
if (!((env->me_free_pgs = mdb_midl_alloc(MDB_IDL_UM_MAX)) &&
(env->me_dirty_list = calloc(MDB_IDL_UM_SIZE, sizeof(MDB_ID2)))))
rc = ENOMEM;
}

44
libraries/liblmdb/midl.c
View File

@ -117,16 +117,18 @@ int mdb_midl_insert( MDB_IDL ids, MDB_ID id )
}
#endif
MDB_IDL mdb_midl_alloc(void)
MDB_IDL mdb_midl_alloc(int num)
{
MDB_IDL ids = malloc((MDB_IDL_UM_MAX+1) * sizeof(MDB_ID));
*ids++ = MDB_IDL_UM_MAX;
MDB_IDL ids = malloc((num+2) * sizeof(MDB_ID));
if (ids)
*ids++ = num;
return ids;
}
void mdb_midl_free(MDB_IDL ids)
{
free(ids-1);
if (ids)
free(ids-1);
}
int mdb_midl_shrink( MDB_IDL *idp )
@ -141,19 +143,26 @@ int mdb_midl_shrink( MDB_IDL *idp )
return 0;
}
int mdb_midl_grow( MDB_IDL *idp, int num )
{
MDB_IDL idn = *idp-1;
/* grow it */
idn = realloc(idn, (*idn + num + 2) * sizeof(MDB_ID));
if (!idn)
return ENOMEM;
*idn++ += num;
*idp = idn;
return 0;
}
int mdb_midl_append( MDB_IDL *idp, MDB_ID id )
{
MDB_IDL ids = *idp;
/* Too big? */
if (ids[0] >= ids[-1]) {
MDB_IDL idn = ids-1;
/* grow it */
idn = realloc(idn, (*idn + MDB_IDL_UM_MAX + 1) * sizeof(MDB_ID));
if (!idn)
return -1;
*idn++ += MDB_IDL_UM_MAX;
ids = idn;
*idp = ids;
if (mdb_midl_grow(idp, MDB_IDL_UM_MAX))
return ENOMEM;
ids = *idp;
}
ids[0]++;
ids[ids[0]] = id;
@ -165,14 +174,9 @@ int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app )
MDB_IDL ids = *idp;
/* Too big? */
if (ids[0] + app[0] >= ids[-1]) {
MDB_IDL idn = ids-1;
/* grow it */
idn = realloc(idn, (*idn + app[-1]) * sizeof(MDB_ID));
if (!idn)
return -1;
*idn++ += app[-1];
ids = idn;
*idp = ids;
if (mdb_midl_grow(idp, app[0]))
return ENOMEM;
ids = *idp;
}
memcpy(&ids[ids[0]+1], &app[1], app[0] * sizeof(MDB_ID));
ids[0] += app[0];

12
libraries/liblmdb/midl.h
View File

@ -115,10 +115,10 @@ int mdb_midl_insert( MDB_IDL ids, MDB_ID id );
#endif
/** Allocate an IDL.
* Allocates memory for an IDL of a default size.
* Allocates memory for an IDL of the given size.
* @return IDL on success, NULL on failure.
*/
MDB_IDL mdb_midl_alloc(void);
MDB_IDL mdb_midl_alloc(int num);
/** Free an IDL.
* @param[in] ids The IDL to free.
@ -132,6 +132,14 @@ void mdb_midl_free(MDB_IDL ids);
*/
int mdb_midl_shrink(MDB_IDL *idp);
/** Grow an IDL.
* Add room for num additional elements.
* @param[in,out] idp Address of the IDL to grow.
* @param[i] num Number of elements to add.
* @return 0 on success, -1 on failure.
*/
int mdb_midl_grow(MDB_IDL *idp, int num);
/** Append an ID onto an IDL.
* @param[in,out] idp Address of the IDL to append to.
* @param[in] id The ID to append.