/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

#include "test.h"

// verify that a db->put with NOOVERWRITE grabs a write lock not a read lock.
// we use two transactions.  the first transaction tries to put with NOOVERWRITE
// and finds that the key already exists.  it now holds a write lock on the key.
// the second transaction trys to put the same key with NOOVERWRITE and gets
// LOCK_NOTGRANTED.  the second transaction can not put the key until the first
// transaction commits.

int test_main(int argc, char * const argv[]) {
    int r;

    const char *env_dir = TOKU_TEST_FILENAME;
    const char *db_filename = "replacetest";

    parse_args(argc, argv);

    char rm_cmd[strlen(env_dir) + strlen("rm -rf ") + 1];
    snprintf(rm_cmd, sizeof(rm_cmd), "rm -rf %s", env_dir);
    r = system(rm_cmd); assert_zero(r);

    r = toku_os_mkdir(env_dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); assert_zero(r);

    DB_ENV *env = NULL;
    r = db_env_create(&env, 0); assert_zero(r);
    int env_open_flags = DB_CREATE | DB_PRIVATE | DB_INIT_MPOOL | DB_INIT_TXN | DB_INIT_LOCK | DB_INIT_LOG;
    r = env->open(env, env_dir, env_open_flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert_zero(r);

    // create the db
    DB *db = NULL;
    r = db_create(&db, env, 0); assert_zero(r);
    DB_TXN *create_txn = NULL;
    r = env->txn_begin(env, NULL, &create_txn, 0); assert_zero(r);
    r = db->open(db, create_txn, db_filename, NULL, DB_BTREE, DB_CREATE, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert_zero(r);
    r = create_txn->commit(create_txn, 0); assert_zero(r);

    DB_TXN *write_txn = NULL;
    r = env->txn_begin(env, NULL, &write_txn, 0); assert_zero(r);

    int k = htonl(42); int v = 42;
    DBT key; dbt_init(&key, &k, sizeof k);
    DBT val; dbt_init(&val, &v, sizeof v);
    r = db->put(db, write_txn, &key, &val, DB_NOOVERWRITE); assert_zero(r);
    r = write_txn->commit(write_txn, 0); assert_zero(r);

    DB_TXN *txn1 = NULL;
    r = env->txn_begin(env, NULL, &txn1, 0); assert_zero(r);

    DB_TXN *txn2 = NULL;
    r = env->txn_begin(env, NULL, &txn2, 0); assert_zero(r);

    r = db->put(db, txn1, &key, &val, DB_NOOVERWRITE); assert(r == DB_KEYEXIST);
    r = db->put(db, txn2, &key, &val, DB_NOOVERWRITE); assert(r == DB_LOCK_NOTGRANTED);
    r = db->put(db, txn1, &key, &val, 0); assert_zero(r);
    r = db->put(db, txn2, &key, &val, 0); assert(r == DB_LOCK_NOTGRANTED);
    r = txn1->commit(txn1, 0); assert_zero(r);
    r = db->put(db, txn2, &key, &val, 0); assert_zero(r);
    r = txn2->commit(txn2, 0); assert_zero(r);

    r = db->close(db, 0); assert_zero(r);

    r = env->close(env, 0); assert_zero(r);
    return 0;
}