/* -*- 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
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation, and provided that the
  following conditions are met:

      * Redistributions of source code must retain this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
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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.
  This software is covered by US Patent No. 8,489,638.

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  "THIS IMPLEMENTATION" means the copyrightable works distributed by
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  the absence of this license would be infringed by THIS
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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."

#include "test.h"

#include <portability/toku_pthread.h>
#include <portability/toku_atomic.h>

static DB_ENV *env;
static DB *db;
static DB_TXN *txn1, *txn2;
static const int magic_key = 100;
static int callback_calls;
toku_pthread_t thread1;

static void lock_not_granted(DB *_db, uint64_t requesting_txnid,
                             const DBT *left_key, const DBT *right_key,
                             uint64_t blocking_txnid) {
    toku_sync_fetch_and_add(&callback_calls, 1);
    invariant(strcmp(_db->get_dname(_db), db->get_dname(db)) == 0);
    if (requesting_txnid == txn2->id64(txn2)) {
        invariant(blocking_txnid == txn1->id64(txn1));
        invariant(*reinterpret_cast<int *>(left_key->data) == magic_key);
        invariant(*reinterpret_cast<int *>(right_key->data) == magic_key);
    } else {
        invariant(blocking_txnid == txn2->id64(txn2));
        invariant(*reinterpret_cast<int *>(left_key->data) == magic_key + 1);
        invariant(*reinterpret_cast<int *>(right_key->data) == magic_key + 1);
    }
}

static void acquire_lock(DB_TXN *txn, int key) {
    int val = 0;
    DBT k, v;
    dbt_init(&k, &key, sizeof(int));
    dbt_init(&v, &val, sizeof(int));
    (void) db->put(db, txn, &k, &v, 0);
}

struct acquire_lock_extra {
    acquire_lock_extra(DB_TXN *x, int k) :
        txn(x), key(k) {
    }
    DB_TXN *txn;
    int key;
};

static void *acquire_lock_thread(void *arg) {
    acquire_lock_extra *info = reinterpret_cast<acquire_lock_extra *>(arg);
    acquire_lock(info->txn, info->key);
    return NULL;
}

int test_main(int UU(argc), char *const UU(argv[])) {
    int r;
    const int env_flags = DB_INIT_MPOOL | DB_CREATE | DB_THREAD |
        DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_TXN | DB_PRIVATE;

    toku_os_recursive_delete(TOKU_TEST_FILENAME);
    r = toku_os_mkdir(TOKU_TEST_FILENAME, 0755); CKERR(r);

    r = db_env_create(&env, 0); CKERR(r);
    r = env->open(env, TOKU_TEST_FILENAME, env_flags, 0755); CKERR(r);
    r = env->set_lock_timeout(env, 1000, nullptr);
    r = env->set_lock_timeout_callback(env, lock_not_granted);

    r = db_create(&db, env, 0); CKERR(r);
    r = db->open(db, NULL, "test", NULL, DB_BTREE, DB_CREATE, 0777); CKERR(r);

    r = env->txn_begin(env, NULL, &txn1, DB_SERIALIZABLE); CKERR(r);
    r = env->txn_begin(env, NULL, &txn2, DB_SERIALIZABLE); CKERR(r);

    // Extremely simple test. Get lock [0, 0] on txn1, then asynchronously
    // attempt to get that lock in txn2. The timouet callback should get called.

    acquire_lock(txn1, magic_key);
    invariant(callback_calls == 0);

    acquire_lock(txn2, magic_key);
    invariant(callback_calls == 1);

    // If we enduce a deadlock, the callback should get called.
    acquire_lock(txn2, magic_key + 1);
    toku_pthread_t thread;
    acquire_lock_extra e(txn1, magic_key + 1);
    r = toku_pthread_create(&thread, NULL, acquire_lock_thread, &e);
    usleep(100000);
    acquire_lock(txn2, magic_key);
    invariant(callback_calls == 2);
    void *v;
    r = toku_pthread_join(thread, &v); CKERR(r);
    invariant(callback_calls == 3);

    // If we set the callback to null, then it shouldn't get called anymore.
    env->set_lock_timeout_callback(env, nullptr);
    acquire_lock(txn2, magic_key);
    invariant(callback_calls == 3);

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

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