/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
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  This program is free software; you can redistribute it and/or modify
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  published by the Free Software Foundation, and provided that the
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      * Redistributions of source code must retain this COPYING
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  You should have received a copy of the GNU General Public License
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COPYRIGHT NOTICE:

  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

DISCLAIMER:

  This program 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.

UNIVERSITY PATENT NOTICE:

  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.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.

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*/

#ident "Copyright (c) 2007-2013 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."
// verify that a simle write lock deadlock is detected by the BDB locker
// A write locks L
// B write locks M
// A tries to write lock M, gets DB_LOCK_NOTGRANTED
// B tries to write lock L, gets DB_LOCK_NOTGRANTED

#include "test.h"

static void simple_deadlock(DB_ENV *db_env) {
    int r;

    uint32_t locker_a;
    r = db_env->lock_id(db_env, &locker_a); assert(r == 0);
    uint32_t locker_b;
    r = db_env->lock_id(db_env, &locker_b); assert(r == 0);

    DBT object_l = { .data = (char *) "L", .size = 1 };
    DBT object_m = { .data = (char *) "M", .size = 1 };

    DB_LOCK lock_a_l;
    r = db_env->lock_get(db_env, locker_a, DB_LOCK_NOWAIT, &object_l, DB_LOCK_WRITE, &lock_a_l); assert(r == 0);

    DB_LOCK lock_b_m;
    r = db_env->lock_get(db_env, locker_b, DB_LOCK_NOWAIT, &object_m, DB_LOCK_WRITE, &lock_b_m); assert(r == 0);

    DB_LOCK lock_a_m;
    r = db_env->lock_get(db_env, locker_a, DB_LOCK_NOWAIT, &object_m, DB_LOCK_WRITE, &lock_a_m); assert(r == DB_LOCK_NOTGRANTED);

    DB_LOCK lock_b_l;
    r = db_env->lock_get(db_env, locker_b, DB_LOCK_NOWAIT, &object_l, DB_LOCK_WRITE, &lock_b_l); assert(r == DB_LOCK_NOTGRANTED);

    r = db_env->lock_put(db_env, &lock_a_l); assert(r == 0);
    r = db_env->lock_put(db_env, &lock_b_m); assert(r == 0);

    r = db_env->lock_id_free(db_env, locker_a); assert(r == 0);
    r = db_env->lock_id_free(db_env, locker_b); assert(r == 0);
}

int test_main(int argc, char * const argv[]) {
    uint64_t cachesize = 0;
    int do_txn = 1;
    const char *db_env_dir = TOKU_TEST_FILENAME;
    int db_env_open_flags = DB_CREATE | DB_PRIVATE | DB_INIT_MPOOL | DB_INIT_TXN | DB_INIT_LOCK | DB_INIT_LOG | DB_THREAD;

    // parse_args(argc, argv);
    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
            verbose++;
            continue;
        }
        if (strcmp(argv[i], "-q") == 0 || strcmp(argv[i], "--quiet") == 0) {
            if (verbose > 0)
                verbose--;
            continue;
        }
        assert(0);
    }

    // setup env
    int r;
    char rm_cmd[strlen(db_env_dir) + strlen("rm -rf ") + 1];
    snprintf(rm_cmd, sizeof(rm_cmd), "rm -rf %s", db_env_dir);
    r = system(rm_cmd); assert(r == 0);

    r = toku_os_mkdir(db_env_dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); assert(r == 0);

    DB_ENV *db_env = NULL;
    r = db_env_create(&db_env, 0); assert(r == 0);
    if (cachesize) {
        const uint64_t gig = 1 << 30;
        r = db_env->set_cachesize(db_env, cachesize / gig, cachesize % gig, 1); assert(r == 0);
    }
    if (!do_txn)
        db_env_open_flags &= ~(DB_INIT_TXN | DB_INIT_LOG);
    r = db_env->open(db_env, db_env_dir, db_env_open_flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert(r == 0);
#if 0 && defined(USE_BDB)
    r = db_env->set_lk_detect(db_env, DB_LOCK_YOUNGEST); assert(r == 0);
#endif

    // run test
    simple_deadlock(db_env);

    // close env
    r = db_env->close(db_env, 0); assert(r == 0); db_env = NULL;

    return 0;
}
