/* -*- 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."

// have multiple threads try to put key 0 into the same db. one thread should gain a write lock on the key.
// the other threads should block until the thread that owns the lock commits its transaction.  then, one
// of the blocked transactions should gain the lock and its owning thread resumed.

#include "test.h"
#include "toku_pthread.h"

// pound on key == 0 and hold the write lock for a time less than the lock timeout
static void blocking_put(DB_ENV *db_env, DB *db, uint64_t nrows, long sleeptime) {
    int r;

    for (uint64_t i = 0; i < nrows; i++) {
        DB_TXN *txn = NULL;
        r = db_env->txn_begin(db_env, NULL, &txn, 0); assert(r == 0);

        uint64_t k = 0;
        DBT key = { .data = &k, .size = sizeof k};
        DBT val = { .data = &k, .size = sizeof k};
        r = db->put(db, txn, &key, &val, 0); assert(r == 0);

        usleep(sleeptime);

        r = txn->commit(txn, 0); assert(r == 0);
        if (verbose)
            printf("%lu %" PRIu64 "\n", (unsigned long) toku_pthread_self(), i);
    }
}

struct blocking_put_args {
    DB_ENV *db_env;
    DB *db;
    uint64_t nrows;
    long sleeptime;
};

static void *blocking_put_thread(void *arg) {
    struct blocking_put_args *a = (struct blocking_put_args *) arg;
    blocking_put(a->db_env, a->db, a->nrows, a->sleeptime);
    return arg;
}

int test_main(int argc, char * const argv[]) {
    uint64_t cachesize = 0;
    uint32_t pagesize = 0;
    uint64_t nrows = 100;
    int nthreads = 2;
    long sleeptime = 100000;
    const char *db_env_dir = TOKU_TEST_FILENAME;
    const char *db_filename = "test.db";
    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;
        }
        if (strcmp(argv[i], "--nrows") == 0 && i+1 < argc) {
            nrows = atoll(argv[++i]);
            continue;
        }
        if (strcmp(argv[i], "--nthreads") == 0 && i+1 < argc) {
            nthreads = atoi(argv[++i]);
            continue;
        }
        if (strcmp(argv[i], "--sleeptime") == 0 && i+1 < argc) {
            sleeptime = atol(argv[++i]);
            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);
    }
    r = db_env->open(db_env, db_env_dir, db_env_open_flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert(r == 0);
    r = db_env->set_lock_timeout(db_env, 30 * 1000, nullptr); assert(r == 0);

    // create the db
    DB *db = NULL;
    r = db_create(&db, db_env, 0); assert(r == 0);
    if (pagesize) {
        r = db->set_pagesize(db, pagesize); assert(r == 0);
    }
    r = db->open(db, NULL, db_filename, NULL, DB_BTREE, DB_CREATE|DB_AUTO_COMMIT|DB_THREAD, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); assert(r == 0);

    toku_pthread_t tids[nthreads];
    struct blocking_put_args a = { db_env, db, nrows, sleeptime };
    for (int i = 0; i < nthreads-1; i++) {
        r = toku_pthread_create(&tids[i], NULL, blocking_put_thread, &a); assert(r == 0);
    }
    blocking_put(db_env, db, nrows, sleeptime);
    for (int i = 0; i < nthreads-1; i++) {
        void *ret;
        r = toku_pthread_join(tids[i], &ret); assert(r == 0);
    }

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

    return 0;
}