Method dec_prep_xids

phx_percona/percona/sql/binlog.h:337–352

Decrement the prepared XID counter. Signal m_prep_xids_cond if the counter reaches zero. */

    Signal m_prep_xids_cond if the counter reaches zero.
   */
  void dec_prep_xids(THD *thd) {
    DBUG_ENTER("MYSQL_BIN_LOG::dec_prep_xids");
    my_atomic_rwlock_wrlock(&m_prep_xids_lock);
    int32 result= my_atomic_add32(&m_prep_xids, -1);
    DBUG_PRINT("debug", ("m_prep_xids: %d", result - 1));
    my_atomic_rwlock_wrunlock(&m_prep_xids_lock);
    thd->transaction.flags.xid_written= false;
    /* If the old value was 1, it is zero now. */
    if (result == 1)
    {
      mysql_mutex_lock(&LOCK_xids);
      mysql_cond_signal(&m_prep_xids_cond);
      mysql_mutex_unlock(&LOCK_xids);
    }
    DBUG_VOID_RETURN;
  }

  int32 get_prep_xids() {
    my_atomic_rwlock_rdlock(&m_prep_xids_lock);