/* -*- 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 the DB_RMW flag on cursor create grabs write locks for cursor set operations

static void test_create_rmw(DB_ENV *env, DB *db, int k, uint32_t txn1_flags, uint32_t txn2_flags, int expect_r) {
    int 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);

    DBC *c1 = NULL;
    r = db->cursor(db, txn1, &c1, txn1_flags); assert_zero(r);

    DBC *c2 = NULL;
    r = db->cursor(db, txn2, &c2, txn2_flags); assert_zero(r);

    DBT key; dbt_init(&key, &k, sizeof k);
    DBT val; memset(&val, 0, sizeof val);
    r = c1->c_get(c1, &key, &val, DB_SET); assert_zero(r);

    r = c2->c_get(c2, &key, &val, DB_SET); assert(r == expect_r);

    r = c1->c_close(c1); assert_zero(r);
    r = c2->c_close(c2); assert_zero(r);

    r = txn1->commit(txn1, 0); assert_zero(r);
    r = txn2->commit(txn2, 0); assert_zero(r);
}

// verify that the DB_RMW flag to the cursor set operations grabs write locks

static void test_set_rmw(DB_ENV *env, DB *db, int k, uint32_t txn1_flags, uint32_t txn2_flags, int expect_r) {
    int 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);

    DBC *c1 = NULL;
    r = db->cursor(db, txn1, &c1, 0); assert_zero(r);

    DBC *c2 = NULL;
    r = db->cursor(db, txn2, &c2, 0); assert_zero(r);

    DBT key; dbt_init(&key, &k, sizeof k);
    DBT val; memset(&val, 0, sizeof val);
    r = c1->c_get(c1, &key, &val, DB_SET + txn1_flags); assert_zero(r);

    r = c2->c_get(c2, &key, &val, DB_SET + txn2_flags); assert(r == expect_r);

    r = c1->c_close(c1); assert_zero(r);
    r = c2->c_close(c2); assert_zero(r);

    r = txn1->commit(txn1, 0); assert_zero(r);
    r = txn2->commit(txn2, 0); assert_zero(r);
}

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

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

    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);

#ifdef BLOCKING_ROW_LOCKS_READS_NOT_SHARED
    test_set_rmw(env, db, k, 0, 0, DB_LOCK_NOTGRANTED);
#else
    test_set_rmw(env, db, k, 0, 0, 0);
#endif
    test_set_rmw(env, db, k, 0, DB_RMW, DB_LOCK_NOTGRANTED);
    test_set_rmw(env, db, k, DB_RMW, 0, DB_LOCK_NOTGRANTED);
    test_set_rmw(env, db, k, DB_RMW, DB_RMW, DB_LOCK_NOTGRANTED);

#ifdef BLOCKING_ROW_LOCKS_READS_NOT_SHARED
    test_create_rmw(env, db, k, 0, 0, DB_LOCK_NOTGRANTED);
#else
    test_create_rmw(env, db, k, 0, 0, 0);
#endif
    test_create_rmw(env, db, k, 0, DB_RMW, DB_LOCK_NOTGRANTED);
    test_create_rmw(env, db, k, DB_RMW, 0, DB_LOCK_NOTGRANTED);
    test_create_rmw(env, db, k, DB_RMW, DB_RMW, DB_LOCK_NOTGRANTED);


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

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