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sys_posix: support SCHED_FIFO and mlockall on more OSs

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Real-time scheduling and memory locking is available on posix compliant
OSs. This patch centralizes this functionality and brings support to
FreeBSD, NetBSD, and Solaris.

[ML: updated coding style]
This commit is contained in:
Stefan R. Filipek
2019-04-19 14:41:14 -04:00
committed by Miroslav Lichvar
parent a78031ce0d
commit c5c80ef400
7 changed files with 195 additions and 105 deletions
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109
sys_posix.c Normal file
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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2003
* Copyright (C) John G. Hasler 2009
* Copyright (C) Miroslav Lichvar 2009-2012, 2014-2018
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
This module is for POSIX compliant operating systems.
*/
#include "config.h"
#include "sysincl.h"
#include <sys/utsname.h>
#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
#include <pthread.h>
#include <sched.h>
#endif
#if defined(HAVE_MLOCKALL)
#include <sys/mman.h>
#endif
#if defined(HAVE_SETRLIMIT_MEMLOCK)
#include <sys/resource.h>
#endif
#include "sys_posix.h"
#include "conf.h"
#include "local.h"
#include "logging.h"
#include "util.h"
/* ================================================== */
#if defined(HAVE_PTHREAD_SETSCHEDPARAM)
/* Install SCHED_FIFO real-time scheduler with specified priority */
void
SYS_Posix_SetScheduler(int priority)
{
struct sched_param sched;
int pmax, pmin;
if (priority < 1 || priority > 99)
LOG_FATAL("Bad scheduler priority: %d", priority);
sched.sched_priority = priority;
pmax = sched_get_priority_max(SCHED_FIFO);
pmin = sched_get_priority_min(SCHED_FIFO);
if (priority > pmax) {
sched.sched_priority = pmax;
} else if (priority < pmin) {
sched.sched_priority = pmin;
}
if (pthread_setschedparam(pthread_self(), SCHED_FIFO, &sched) < 0) {
LOG(LOGS_ERR, "pthread_setschedparam() failed");
} else {
DEBUG_LOG("Enabled SCHED_FIFO with priority %d", sched.sched_priority);
}
}
#endif /* HAVE_PTHREAD_SETSCHEDPARAM */
/* ================================================== */
#if defined(HAVE_MLOCKALL)
/* Lock the process into RAM so that it will never be swapped out */
void
SYS_Posix_MemLockAll(void)
{
#if defined(HAVE_SETRLIMIT_MEMLOCK)
struct rlimit rlim;
/* Ensure we can reserve as much as we need */
rlim.rlim_max = RLIM_INFINITY;
rlim.rlim_cur = RLIM_INFINITY;
if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
LOG(LOGS_ERR, "setrlimit() failed");
return;
}
#endif
if (mlockall(MCL_CURRENT|MCL_FUTURE) < 0) {
LOG(LOGS_ERR, "mlockall() failed");
} else {
DEBUG_LOG("Successfully locked into RAM");
}
}
#endif /* HAVE_MLOCKALL */