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/*
* Copyright (C) 2013-2017 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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 code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(HAVE_LIB_PTHREAD) && defined(__linux__)
#include <semaphore.h>
#endif
static uint64_t opt_semaphore_posix_procs = DEFAULT_SEMAPHORE_PROCS;
static bool set_semaphore_posix_procs = false;
void stress_set_semaphore_posix_procs(const char *optarg)
{
set_semaphore_posix_procs = true;
opt_semaphore_posix_procs = get_uint64_byte(optarg);
check_range("sem-procs", opt_semaphore_posix_procs,
MIN_SEMAPHORE_PROCS, MAX_SEMAPHORE_PROCS);
}
#if defined(HAVE_LIB_PTHREAD) && defined(__linux__)
/*
* stress_semaphore_posix_init()
* initialize a POSIX semaphore
*/
void stress_semaphore_posix_init(void)
{
/* create a mutex */
if (sem_init(&shared->sem_posix.sem, 1, 1) >= 0) {
shared->sem_posix.init = true;
return;
}
if (opt_sequential) {
pr_inf(stdout, "semaphore init (POSIX) failed: errno=%d: "
"(%s), skipping semaphore stressor\n",
errno, strerror(errno));
} else {
pr_err(stderr, "semaphore init (POSIX) failed: errno=%d: "
"(%s)\n", errno, strerror(errno));
}
}
/*
* stress_semaphore_posix_destroy()
* destroy a POSIX semaphore
*/
void stress_semaphore_posix_destroy(void)
{
if (shared->sem_posix.init) {
if (sem_destroy(&shared->sem_posix.sem) < 0) {
pr_err(stderr, "semaphore destroy failed: errno=%d (%s)\n",
errno, strerror(errno));
}
}
}
/*
* semaphore_posix_thrash()
* exercise the semaphore
*/
static void semaphore_posix_thrash(
const char *name,
const uint64_t max_ops,
uint64_t *counter)
{
do {
int i;
struct timespec timeout;
if (clock_gettime(CLOCK_REALTIME, &timeout) < 0) {
pr_fail_dbg(name, "clock_gettime");
return;
}
timeout.tv_sec++;
for (i = 0; i < 1000; i++) {
if (sem_timedwait(&shared->sem_posix.sem, &timeout) < 0) {
if (errno == ETIMEDOUT)
goto timed_out;
if (errno != EINTR)
pr_fail_dbg(name, "sem_wait");
break;
}
(*counter)++;
if (sem_post(&shared->sem_posix.sem) < 0) {
pr_fail_dbg(name, "sem_post");
break;
}
timed_out:
if (!opt_do_run)
break;
}
} while (opt_do_run && (!max_ops || *counter < max_ops));
}
/*
* semaphore_posix_spawn()
* spawn a process
*/
static pid_t semaphore_posix_spawn(
const char *name,
const uint64_t max_ops,
uint64_t *counter)
{
pid_t pid;
again:
pid = fork();
if (pid < 0) {
if (opt_do_run && (errno == EAGAIN))
goto again;
return -1;
}
if (pid == 0) {
(void)setpgid(0, pgrp);
stress_parent_died_alarm();
semaphore_posix_thrash(name, max_ops, counter);
exit(EXIT_SUCCESS);
}
(void)setpgid(pid, pgrp);
return pid;
}
/*
* stress_sem()
* stress system by POSIX sem ops
*/
int stress_sem(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
pid_t pids[MAX_SEMAPHORE_PROCS];
uint64_t i;
(void)instance;
if (!set_semaphore_posix_procs) {
if (opt_flags & OPT_FLAGS_MAXIMIZE)
opt_semaphore_posix_procs = MAX_SEMAPHORE_PROCS;
if (opt_flags & OPT_FLAGS_MINIMIZE)
opt_semaphore_posix_procs = MIN_SEMAPHORE_PROCS;
}
if (!shared->sem_posix.init) {
pr_err(stderr, "%s: aborting, semaphore not initialised\n", name);
return EXIT_FAILURE;
}
memset(pids, 0, sizeof(pids));
for (i = 0; i < opt_semaphore_posix_procs; i++) {
pids[i] = semaphore_posix_spawn(name, max_ops, counter);
if (!opt_do_run || pids[i] < 0)
goto reap;
}
/* Wait for termination */
while (opt_do_run && (!max_ops || *counter < max_ops))
(void)shim_usleep(100000);
reap:
for (i = 0; i < opt_semaphore_posix_procs; i++) {
if (pids[i] > 0)
(void)kill(pids[i], SIGKILL);
}
for (i = 0; i < opt_semaphore_posix_procs; i++) {
if (pids[i] > 0) {
int status;
(void)waitpid(pids[i], &status, 0);
}
}
return EXIT_SUCCESS;
}
#else
void stress_semaphore_posix_init(void)
{
}
void stress_semaphore_posix_destroy(void)
{
}
int stress_sem(
uint64_t *const counter,
const uint32_t instance,
const uint64_t max_ops,
const char *name)
{
return stress_not_implemented(counter, instance, max_ops, name);
}
#endif
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