static void slmdb_assert_cb(MDB_env *env, const char *text)
{
SLMDB *slmdb = (SLMDB *) mdb_env_get_userctx(env);
if (slmdb->assert_fn)
slmdb->assert_fn(slmdb->cb_context, text);
}
/* perform kick/kill a laggard readers */
static int
mdb_oom_handler(MDB_env *env, int pid, void* thread_id, size_t txnid, unsigned gap, int retry)
{
uint64_t now_ns = ldap_now_steady_ns();
struct mdb_info *mdb = mdb_env_get_userctx(env);
if (retry < 0) {
double elapsed = (now_ns - mdb->mi_oom_timestamp_ns) * 1e-9;
const char* suffix = "s";
if (elapsed < 1) {
elapsed *= 1000;
suffix = "ms";
}
if (gap) {
Debug( LDAP_DEBUG_ANY, "oom-handler: done, txnid %zu, got/forward %u, elapsed/waited %.3f%s, %d retries\n",
txnid, gap, elapsed, suffix, -retry );
} else {
Debug( LDAP_DEBUG_ANY, "oom-handler: unable, txnid %zu, elapsed/waited %.3f%s, %d retries\n",
txnid, elapsed, suffix, -retry );
}
mdb->mi_oom_timestamp_ns = 0;
return 0;
}
if (! mdb->mi_oom_flags)
return -1;
else if (! mdb->mi_oom_timestamp_ns) {
mdb->mi_oom_timestamp_ns = now_ns;
Debug( LDAP_DEBUG_ANY, "oom-handler: begin, txnid %zu lag %u\n",
txnid, gap );
}
if ( (mdb->mi_oom_flags & MDBX_OOM_KILL) && pid != getpid() ) {
if ( kill( pid, SIGKILL ) == 0 ) {
Debug( LDAP_DEBUG_ANY, "oom-handler: txnid %zu lag %u, KILLED pid %i\n",
txnid, gap, pid );
ldap_pvt_thread_yield();
return 2;
}
if ( errno == ESRCH )
return 0;
Debug( LDAP_DEBUG_ANY, "oom-handler: retry %d, UNABLE kill pid %i: %s\n",
retry, pid, STRERROR(errno) );
}
if ( (mdb->mi_oom_flags & MDBX_OOM_YIELD) && ! slapd_shutdown ) {
if (retry == 0)
Debug( LDAP_DEBUG_ANY, "oom-handler: txnid %zu lag %u, WAITING\n",
txnid, gap );
if (retry < 42)
ldap_pvt_thread_yield();
else
usleep(retry);
return 0;
}
mdb->mi_oom_timestamp_ns = 0;
return -1;
}
