Save pid in MDB_env instead of repeating getpid().

An open MDB environment does not survive or catch fork(),
so repeating getpid() was pointless.

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 809f62e..37403fb 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -906,6 +906,7 @@ struct MDB_env {
        unsigned int    me_maxreaders;  /**< size of the reader table */
        MDB_dbi         me_numdbs;              /**< number of DBs opened */
        MDB_dbi         me_maxdbs;              /**< size of the DB table */
+       pid_t           me_pid;         /**< process ID of this env */
        char            *me_path;               /**< path to the DB files */
        char            *me_map;                /**< the memory map of the data file */
        MDB_txninfo     *me_txns;               /**< the memory map of the lock file */
@@ -1625,7 +1626,7 @@ mdb_txn_renew0(MDB_txn *txn)
        if (txn->mt_flags & MDB_TXN_RDONLY) {
                MDB_reader *r = pthread_getspecific(env->me_txkey);
                if (!r) {
-                       pid_t pid = getpid();
+                       pid_t pid = env->me_pid;
                        pthread_t tid = pthread_self();
 
                        LOCK_MUTEX_R(env);
@@ -2506,6 +2507,7 @@ mdb_env_create(MDB_env **env)
        e->me_fd = INVALID_HANDLE_VALUE;
        e->me_lfd = INVALID_HANDLE_VALUE;
        e->me_mfd = INVALID_HANDLE_VALUE;
+       e->me_pid = getpid();
        VGMEMP_CREATE(e,0,0);
        *env = e;
        return MDB_SUCCESS;
@@ -3255,7 +3257,7 @@ mdb_env_close(MDB_env *env)
                close(env->me_mfd);
        close(env->me_fd);
        if (env->me_txns) {
-               pid_t pid = getpid();
+               pid_t pid = env->me_pid;
                unsigned int i;
                for (i=0; i<env->me_txns->mti_numreaders; i++)
                        if (env->me_txns->mti_readers[i].mr_pid == pid)