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548bc646b2
change minicron to count the period from the beginning of the callback's execution and not the end. For checkpoints, this makes them reliably start every 60 seconds.
248 lines
9.1 KiB
C++
248 lines
9.1 KiB
C++
/* -*- 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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/*
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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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GRANT (below).
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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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02110-1301, USA.
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COPYRIGHT NOTICE:
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TokuDB, Tokutek Fractal Tree Indexing Library.
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Copyright (C) 2007-2013 Tokutek, Inc.
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DISCLAIMER:
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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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PATENT RIGHTS GRANT:
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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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under this License.
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*/
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#ident "Copyright (c) 2007-2013 Tokutek Inc. All rights reserved."
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#ident "$Id$"
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#include <toku_portability.h>
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#include <errno.h>
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#include <string.h>
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#include "toku_assert.h"
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#include "fttypes.h"
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#include "minicron.h"
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static void
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toku_gettime (toku_timespec_t *a) {
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struct timeval tv;
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gettimeofday(&tv, 0);
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a->tv_sec = tv.tv_sec;
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a->tv_nsec = tv.tv_usec * 1000LL;
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}
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static int
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timespec_compare (toku_timespec_t *a, toku_timespec_t *b) {
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if (a->tv_sec > b->tv_sec) return 1;
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if (a->tv_sec < b->tv_sec) return -1;
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if (a->tv_nsec > b->tv_nsec) return 1;
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if (a->tv_nsec < b->tv_nsec) return -1;
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return 0;
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}
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// Implementation notes:
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// When calling do_shutdown or change_period, the mutex is obtained, the variables in the minicron struct are modified, and
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// the condition variable is signalled. Possibly the minicron thread will miss the signal. To avoid this problem, whenever
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// the minicron thread acquires the mutex, it must check to see what the variables say to do (e.g., should it shut down?).
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static void*
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minicron_do (void *pv)
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{
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struct minicron *CAST_FROM_VOIDP(p, pv);
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toku_mutex_lock(&p->mutex);
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while (1) {
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if (p->do_shutdown) {
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toku_mutex_unlock(&p->mutex);
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return 0;
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}
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if (p->period_in_ms == 0) {
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// if we aren't supposed to do it then just do an untimed wait.
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toku_cond_wait(&p->condvar, &p->mutex);
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}
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else if (p->period_in_ms <= 1000) {
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toku_mutex_unlock(&p->mutex);
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usleep(p->period_in_ms * 1000);
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toku_mutex_lock(&p->mutex);
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}
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else {
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// Recompute the wakeup time every time (instead of once per call to f) in case the period changges.
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toku_timespec_t wakeup_at = p->time_of_last_call_to_f;
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wakeup_at.tv_sec += (p->period_in_ms/1000);
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wakeup_at.tv_nsec += (p->period_in_ms % 1000) * 1000000;
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toku_timespec_t now;
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toku_gettime(&now);
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int compare = timespec_compare(&wakeup_at, &now);
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// if the time to wakeup has yet to come, then we sleep
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// otherwise, we continue
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if (compare > 0) {
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int r = toku_cond_timedwait(&p->condvar, &p->mutex, &wakeup_at);
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if (r!=0 && r!=ETIMEDOUT) fprintf(stderr, "%s:%d r=%d (%s)", __FILE__, __LINE__, r, strerror(r));
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assert(r==0 || r==ETIMEDOUT);
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}
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}
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// Now we woke up, and we should figure out what to do
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if (p->do_shutdown) {
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toku_mutex_unlock(&p->mutex);
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return 0;
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}
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if (p->period_in_ms > 1000) {
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toku_timespec_t now;
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toku_gettime(&now);
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toku_timespec_t time_to_call = p->time_of_last_call_to_f;
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time_to_call.tv_sec += p->period_in_ms/1000;
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time_to_call.tv_nsec += (p->period_in_ms % 1000) * 1000000;
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int compare = timespec_compare(&time_to_call, &now);
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if (compare <= 0) {
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toku_gettime(&p->time_of_last_call_to_f); // the measured period includes the time to make the call.
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toku_mutex_unlock(&p->mutex);
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int r = p->f(p->arg);
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assert(r==0);
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toku_mutex_lock(&p->mutex);
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}
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}
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else if (p->period_in_ms != 0) {
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toku_mutex_unlock(&p->mutex);
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int r = p->f(p->arg);
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assert(r==0);
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toku_mutex_lock(&p->mutex);
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}
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}
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}
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int
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toku_minicron_setup(struct minicron *p, uint32_t period_in_ms, int(*f)(void *), void *arg)
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{
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p->f = f;
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p->arg = arg;
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toku_gettime(&p->time_of_last_call_to_f);
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//printf("now=%.6f", p->time_of_last_call_to_f.tv_sec + p->time_of_last_call_to_f.tv_nsec*1e-9);
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p->period_in_ms = period_in_ms;
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p->do_shutdown = false;
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toku_mutex_init(&p->mutex, 0);
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toku_cond_init (&p->condvar, 0);
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return toku_pthread_create(&p->thread, 0, minicron_do, p);
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}
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void
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toku_minicron_change_period(struct minicron *p, uint32_t new_period)
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{
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toku_mutex_lock(&p->mutex);
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p->period_in_ms = new_period;
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toku_cond_signal(&p->condvar);
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toku_mutex_unlock(&p->mutex);
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}
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/* unlocked function for use by engine status which takes no locks */
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uint32_t
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toku_minicron_get_period_in_seconds_unlocked(struct minicron *p)
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{
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uint32_t retval = p->period_in_ms/1000;
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return retval;
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}
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/* unlocked function for use by engine status which takes no locks */
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uint32_t
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toku_minicron_get_period_in_ms_unlocked(struct minicron *p)
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{
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uint32_t retval = p->period_in_ms;
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return retval;
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}
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int
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toku_minicron_shutdown(struct minicron *p) {
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toku_mutex_lock(&p->mutex);
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assert(!p->do_shutdown);
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p->do_shutdown = true;
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//printf("%s:%d signalling\n", __FILE__, __LINE__);
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toku_cond_signal(&p->condvar);
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toku_mutex_unlock(&p->mutex);
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void *returned_value;
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//printf("%s:%d joining\n", __FILE__, __LINE__);
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int r = toku_pthread_join(p->thread, &returned_value);
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if (r!=0) fprintf(stderr, "%s:%d r=%d (%s)\n", __FILE__, __LINE__, r, strerror(r));
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assert(r==0); assert(returned_value==0);
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toku_cond_destroy(&p->condvar);
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toku_mutex_destroy(&p->mutex);
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//printf("%s:%d shutdowned\n", __FILE__, __LINE__);
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return 0;
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}
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bool
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toku_minicron_has_been_shutdown(struct minicron *p) {
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return p->do_shutdown;
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}
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