/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
#ident "Copyright (c) 2007-2012 Tokutek Inc.  All rights reserved."
#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."
#include "test.h"

// verify that prelocking a write range that overlapping a read lock conflicts 

static int prelock_range(DBC *cursor, int left, int right) {
    DBT key_left; dbt_init(&key_left, &left, sizeof left);
    DBT key_right; dbt_init(&key_right, &right, sizeof right);
    int r = cursor->c_pre_acquire_range_lock(cursor, &key_left, &key_right);
    return r;
}

static void test_read_write(DB_ENV *env, DB *db, uint32_t iso_flags, int expect_r) {
    int r;

    DB_TXN *txn_a = NULL;
    r = env->txn_begin(env, NULL, &txn_a, iso_flags); assert_zero(r);
    DB_TXN *txn_b = NULL;
    r = env->txn_begin(env, NULL, &txn_b, iso_flags); assert_zero(r);

    DBC *cursor_a = NULL;
    r = db->cursor(db, txn_a, &cursor_a, 0); assert_zero(r);
    DBC *cursor_b = NULL;
    r = db->cursor(db, txn_b, &cursor_b, DB_RMW); assert_zero(r);

    r = prelock_range(cursor_a, htonl(10), htonl(100)); assert_zero(r);
    r = prelock_range(cursor_b, htonl(50), htonl(200)); assert(r == expect_r);

    r = cursor_a->c_close(cursor_a); assert_zero(r);
    r = cursor_b->c_close(cursor_b); assert_zero(r);

    r = txn_a->commit(txn_a, 0); assert_zero(r);
    r = txn_b->commit(txn_b, 0); assert_zero(r);
}

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

    const char *env_dir = ENVDIR;
    const char *db_filename = "prelocktest";

    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);

    test_read_write(env, db, DB_SERIALIZABLE, DB_LOCK_NOTGRANTED);
 
    r = db->close(db, 0); assert_zero(r);

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