Don't malloc the free_pgs list every time

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 10dd09a4c52ca442efee52dd11965066d0271571..7cb64417a46981bfe13b96c50cb479f9e0c2f2a0 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -316,6 +316,7 @@ struct MDB_env {
        MDB_db          *me_dbs[2];
        MDB_oldpages *me_pghead;
        pthread_key_t   me_txkey;       /* thread-key for readers */
+       pgno_t          me_free_pgs[MDB_IDL_UM_SIZE];
 };
 
 #define NODESIZE        offsetof(MDB_node, mn_data)
@@ -610,12 +611,7 @@ mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **ret)
 
                pthread_mutex_lock(&env->me_txns->mt_wmutex);
                env->me_txns->mt_txnid++;
-               txn->mt_free_pgs = malloc(MDB_IDL_UM_SIZEOF);
-               if (txn->mt_free_pgs == NULL) {
-                       free(txn->mt_u.dirty_queue);
-                       free(txn);
-                       return ENOMEM;
-               }
+               txn->mt_free_pgs = env->me_free_pgs;
                txn->mt_free_pgs[0] = 0;
        }
 
@@ -703,7 +699,6 @@ mdb_txn_abort(MDB_txn *txn)
                        STAILQ_REMOVE_HEAD(txn->mt_u.dirty_queue, h.md_next);
                        free(dp);
                }
-               free(txn->mt_free_pgs);
                free(txn->mt_u.dirty_queue);
 
                while ((mop = txn->mt_env->me_pghead)) {
@@ -917,7 +912,6 @@ mdb_txn_commit(MDB_txn *txn)
        }
 
        pthread_mutex_unlock(&env->me_txns->mt_wmutex);
-       free(txn->mt_free_pgs);
        free(txn->mt_u.dirty_queue);
        free(txn);
        txn = NULL;