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dmeventd: exit on idle

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Implementing exit when 'dmeventd' is idle.
Default idle timeout set to 1 hour - after this time period
dmeventd will cleanly exit.

On systems with 'systemd' - service is automatically started with
next contact on dmeventd communication socket/fifo.

On other systems - new dmeventd starts again when lvm2 command detects
its missing and monitoring is needed.
This commit is contained in:
Zdenek Kabelac 2015-10-22 20:36:46 +02:00
parent 4284ba65eb
commit 2af696c32f
2 changed files with 28 additions and 8 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.110 -
======================================
Support exit on idle for dmenventd (1 hour).
Add support to allow unmonitor device from plugin itself.
New design for thread co-operation in dmeventd.
Dmeventd read device status with 'noflush'.

33
daemons/dmeventd/dmeventd.c
View File

@ -87,11 +87,15 @@ static pthread_mutex_t _global_mutex;
static const size_t THREAD_STACK_SIZE = 300 * 1024;
/* Default idle exit timeout 1 hour (in seconds) */
static const time_t DMEVENTD_IDLE_EXIT_TIMEOUT = 60 * 60;
static int _debug_level = 0;
static int _use_syslog = 1;
static int _systemd_activation = 0;
static int _foreground = 0;
static int _restart = 0;
static time_t _idle_since = 0;
static char **_initial_registrations = 0;
/* FIXME Make configurable at runtime */
@ -279,6 +283,7 @@ static void _lib_put(struct dso_data *data)
DEBUGLOG("Unholding control device.");
dm_hold_control_dev(0);
dm_lib_release();
_idle_since = time(NULL);
}
}
}
@ -346,6 +351,7 @@ static struct dso_data *_load_dso(struct message_data *data)
if (dm_list_empty(&_dso_registry)) {
DEBUGLOG("Holding control device open.");
dm_hold_control_dev(1);
_idle_since = 0;
}
/*
@ -2106,7 +2112,7 @@ int main(int argc, char *argv[])
.client_path = DM_EVENT_FIFO_CLIENT,
.server_path = DM_EVENT_FIFO_SERVER
};
int nothreads;
time_t now, idle_exit_timeout = DMEVENTD_IDLE_EXIT_TIMEOUT;
//struct sys_log logdata = {DAEMON_NAME, LOG_DAEMON};
opterr = 0;
@ -2197,23 +2203,36 @@ int main(int argc, char *argv[])
kill(getppid(), SIGTERM);
log_notice("dmeventd ready for processing.");
_idle_since = time(NULL);
if (_initial_registrations)
_process_initial_registrations();
for (;;) {
if (_idle_since) {
if (_exit_now) {
log_info("dmeventd detected break while being idle "
"for %ld second(s), exiting.",
(long) (time(NULL) - _idle_since));
break;
} else if (idle_exit_timeout) {
now = time(NULL);
if (now < _idle_since)
_idle_since = now; /* clock change? */
now -= _idle_since;
if (now >= idle_exit_timeout) {
log_info("dmeventd was idle for %ld second(s), "
"exiting.", (long) now);
break;
}
}
} else if (_exit_now) {
_exit_now = 0;
/*
* When '_exit_now' is set, signal has been received,
* but can not simply exit unless all
* threads are done processing.
*/
_lock_mutex();
nothreads = (dm_list_empty(&_thread_registry) &&
dm_list_empty(&_thread_registry_unused));
_unlock_mutex();
if (nothreads)
break;
log_warn("WARNING: There are still devices being monitored.");
log_warn("WARNING: Refusing to exit.");
}