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/*
* Copyright (C) 2025 Colin Ian King.
*
* 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.
*
*/
#include "stress-ng.h"
#include "core-sync.h"
/*
* stress_sync_start_timeout()
* set the timeout for SIGALRM for a stressor
*/
static void stress_sync_start_timeout(void)
{
if (g_opt_timeout)
(void)alarm((unsigned int)g_opt_timeout);
}
/*
* stress_sync_s_pids_mmap()
* mmap an array of stress_pids_t of num elements; these need
* to map as shared so stressor and parent can load/store the
* state setting.
*/
stress_pid_t *stress_sync_s_pids_mmap(const size_t num)
{
stress_pid_t *s_pids;
const size_t size = num * sizeof(stress_pid_t);
s_pids = (stress_pid_t *)mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_SHARED, -1, 0);
if (s_pids != MAP_FAILED)
stress_set_vma_anon_name(s_pids, size, "s_pids");
return s_pids;
}
/*
* stress_sync_s_pids_munmap()
* unmap num sized stress_pids_t array
*/
int stress_sync_s_pids_munmap(stress_pid_t *s_pids, const size_t num)
{
return munmap((void *)s_pids, num * sizeof(stress_pid_t));
}
/*
* stress_sync_start_init()
* initialize the stress_pid_t state
*/
void stress_sync_start_init(stress_pid_t *s_pid)
{
s_pid->pid = -1;
stress_sync_state_store(s_pid, STRESS_SYNC_START_FLAG_STARTED);
}
/*
* stress_sync_start_wait_s_pid()
* put process into a stop (waiting) state, will be
* woken up by a parent call to stress_sync_start_cont_s_pid()
*/
void stress_sync_start_wait_s_pid(stress_pid_t *s_pid)
{
pid_t pid;
if (!(g_opt_flags & OPT_FLAGS_SYNC_START))
return;
pid = s_pid->oomable_child ? s_pid->oomable_child : s_pid->pid;
if (pid <= 1)
return;
stress_sync_state_store(s_pid, STRESS_SYNC_START_FLAG_WAITING);
if (kill(pid, SIGSTOP) < 0) {
pr_inf("cannot stop stressor on for --sync-start, errno=%d (%s)",
errno, strerror(errno));
}
stress_sync_state_store(s_pid, STRESS_SYNC_START_FLAG_RUNNING);
stress_sync_start_timeout();
}
/*
* stress_sync_start_wait()
* put stressor into a stop (waiting) state, will be
* woken up by a parent call to stress_sync_start_cont_s_pid()
*/
void stress_sync_start_wait(stress_args_t *args)
{
pid_t pid;
stress_pid_t *s_pid;
if (!(g_opt_flags & OPT_FLAGS_SYNC_START))
return;
s_pid = &args->stats->s_pid;
pid = s_pid->oomable_child ? s_pid->oomable_child : s_pid->pid;
if (pid <= 1)
return;
stress_sync_state_store(s_pid, STRESS_SYNC_START_FLAG_WAITING);
if (kill(pid, SIGSTOP) < 0) {
pr_inf("%s: cannot stop stressor on for --sync-start, errno=%d (%s)",
args->name, errno, strerror(errno));
}
stress_sync_state_store(s_pid, STRESS_SYNC_START_FLAG_RUNNING);
stress_sync_start_timeout();
}
/*
* stress_sync_start_cont_s_pid()
* wake up (continue) a stopped process
*/
void stress_sync_start_cont_s_pid(stress_pid_t *s_pid)
{
pid_t pid;
if (!(g_opt_flags & OPT_FLAGS_SYNC_START))
return;
pid = s_pid->oomable_child ? s_pid->oomable_child : s_pid->pid;
if (pid <= 1)
return;
(void)kill(pid, SIGCONT);
}
void stress_sync_start_cont_list(stress_pid_t *s_pids_head)
{
int unready, n_pids;
if (!(g_opt_flags & OPT_FLAGS_SYNC_START))
return;
do {
stress_pid_t *s_pid;
unready = 0;
n_pids = 0;
for (s_pid = s_pids_head; s_pid; s_pid = s_pid->next) {
uint8_t state;
n_pids++;
stress_sync_state_load(s_pid, &state);
if (state == STRESS_SYNC_START_FLAG_FINISHED)
continue;
if (state != STRESS_SYNC_START_FLAG_WAITING)
unready++;
}
if (!unready)
break;
(void)shim_usleep(10000);
unready = 0;
} while (stress_continue_flag());
if (!unready) {
do {
stress_pid_t *s_pid;
int running = 0, finished = 0;
uint8_t state;
for (s_pid = s_pids_head; s_pid; s_pid = s_pid->next) {
stress_sync_start_cont_s_pid(s_pid);
stress_sync_state_load(s_pid, &state);
if (state == STRESS_SYNC_START_FLAG_FINISHED)
finished++;
if (state == STRESS_SYNC_START_FLAG_RUNNING)
running++;
}
if ((running + finished) == n_pids)
break;
(void)shim_usleep(10000);
} while (stress_continue_flag());
}
}
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