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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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COPYING CONDITIONS NOTICE:
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation, and provided that the
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following conditions are met:
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* Redistributions of source code must retain this COPYING
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CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
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PATENT MARKING NOTICE (below), and the PATENT RIGHTS
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* Redistributions in binary form must reproduce this COPYING
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CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
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PATENT MARKING NOTICE (below), and the PATENT RIGHTS
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GRANT (below) in the documentation and/or other materials
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provided with the distribution.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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TokuDB, Tokutek Fractal Tree Indexing Library.
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Copyright (C) 2007-2013 Tokutek, Inc.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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UNIVERSITY PATENT NOTICE:
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The technology is licensed by the Massachusetts Institute of
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Technology, Rutgers State University of New Jersey, and the Research
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Foundation of State University of New York at Stony Brook under
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United States of America Serial No. 11/760379 and to the patents
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and/or patent applications resulting from it.
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PATENT MARKING NOTICE:
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This software is covered by US Patent No. 8,185,551.
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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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Tokutek as part of the Fractal Tree project.
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"PATENT CLAIMS" means the claims of patents that are owned or
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licensable by Tokutek, both currently or in the future; and that in
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the absence of this license would be infringed by THIS
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IMPLEMENTATION or by using or running THIS IMPLEMENTATION.
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"PATENT CHALLENGE" shall mean a challenge to the validity,
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patentability, enforceability and/or non-infringement of any of the
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PATENT CLAIMS or otherwise opposing any of the PATENT CLAIMS.
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Tokutek hereby grants to you, for the term and geographical scope of
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the PATENT CLAIMS, a non-exclusive, no-charge, royalty-free,
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irrevocable (except as stated in this section) patent license to
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make, have made, use, offer to sell, sell, import, transfer, and
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otherwise run, modify, and propagate the contents of THIS
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IMPLEMENTATION, where such license applies only to the PATENT
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CLAIMS. This grant does not include claims that would be infringed
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only as a consequence of further modifications of THIS
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IMPLEMENTATION. If you or your agent or licensee institute or order
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or agree to the institution of patent litigation against any entity
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(including a cross-claim or counterclaim in a lawsuit) alleging that
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THIS IMPLEMENTATION constitutes direct or contributory patent
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infringement, or inducement of patent infringement, then any rights
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granted to you under this License shall terminate as of the date
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such litigation is filed. If you or your agent or exclusive
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licensee institute or order or agree to the institution of a PATENT
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CHALLENGE, then Tokutek may terminate any rights granted to you
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#ident "Copyright (c) 2007-2013 Tokutek Inc. All rights reserved."
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#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."
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#define _MULTI_THREADED
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float tdiff (struct timeval *start, struct timeval *end) {
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return 1e6*(end->tv_sec-start->tv_sec) +(end->tv_usec - start->tv_usec);
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/* Simple function to check the return code and exit the program
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if the function call failed
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static void compResults(char *string, int rc) {
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printf("Error on : %s, rc=%d",
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pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
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void *rdlockThread(void *arg __attribute__((unused)))
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struct timeval start, end;
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printf("Entered thread, getting read lock with mp wait\n");
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gettimeofday(&start, 0);
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rc = pthread_rwlock_tryrdlock(&rwlock);
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gettimeofday(&end, 0);
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printf("pthread_rwlock_tryrdlock took %9.3fus\n", tdiff(&start,&end));
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printf("Retried too many times, failure!\n");
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printf("Could not get lock, do other work, then RETRY...\n");
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compResults("pthread_rwlock_tryrdlock() 1\n", rc);
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printf("unlock the read lock\n");
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gettimeofday(&start, 0);
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rc = pthread_rwlock_unlock(&rwlock);
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gettimeofday(&end, 0);
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compResults("pthread_rwlock_unlock()\n", rc);
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printf("%lu.%6lu to %lu.%6lu is %9.2f\n", start.tv_sec, start.tv_usec, end.tv_sec, end.tv_usec, tdiff(&start, &end));
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printf("Secondary thread complete\n");
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int main(int argc __attribute__((unused)), char **argv)
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struct timeval start, end;
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printf("Enter Testcase - %s\n", argv[0]);
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gettimeofday(&start, 0);
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gettimeofday(&end, 0);
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printf("nop Took %9.2f\n", tdiff(&start, &end));
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printf("Main, get and release the write lock %d times\n", N);
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gettimeofday(&start, 0);
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for (i=0; i<N; i++) {
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rc = pthread_rwlock_wrlock(&rwlock);
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rc = pthread_rwlock_unlock(&rwlock);
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gettimeofday(&end, 0);
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compResults("pthread_rwlock_wrlock()\n", rc);
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printf("Took %9.2fns/op\n", 1000*tdiff(&start, &end)/N);
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printf("Main, get the write lock\n");
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gettimeofday(&start, 0);
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rc = pthread_rwlock_wrlock(&rwlock);
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gettimeofday(&end, 0);
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compResults("pthread_rwlock_wrlock()\n", rc);
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printf("Took %9.2f\n", tdiff(&start, &end));
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printf("Main, create the try read lock thread\n");
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rc = pthread_create(&thread, NULL, rdlockThread, NULL);
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compResults("pthread_create\n", rc);
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printf("Main, wait a bit holding the write lock\n");
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printf("Main, Now unlock the write lock\n");
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gettimeofday(&start, 0);
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rc = pthread_rwlock_unlock(&rwlock);
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gettimeofday(&end, 0);
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compResults("pthread_rwlock_unlock()\n", rc);
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printf("Took %9.2f\n", tdiff(&start, &end));
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printf("Main, wait for the thread to end\n");
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rc = pthread_join(thread, NULL);
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compResults("pthread_join\n", rc);
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rc = pthread_rwlock_destroy(&rwlock);
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compResults("pthread_rwlock_destroy()\n", rc);
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printf("Main completed\n");