void thread_impl_t::set_state( THREAD_STATE state )
{
ULONG prev_state = ThreadState;
if (prev_state == StateTerminated)
return;
ThreadState = state;
switch (state)
{
case StateWait:
runlist_remove();
break;
case StateRunning:
runlist_add();
break;
case StateTerminated:
notify_watchers();
if (prev_state == StateRunning)
runlist_remove();
break;
default:
die("switch to unknown thread state\n");
}
// ready to complete some I/O?
if (num_active_threads() == 0)
check_completions();
}
int crond_main(int argc UNUSED_PARAM, char **argv)
{
time_t t2;
unsigned rescan;
unsigned sleep_time;
unsigned opts;
INIT_G();
/* "-b after -f is ignored", and so on for every pair a-b */
opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
/* -l and -d have numeric param */
":l+" IF_FEATURE_CROND_D(":d+");
opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
&G.log_level, &G.log_filename, &G.crontab_dir_name
IF_FEATURE_CROND_D(,&G.log_level));
/* both -d N and -l N set the same variable: G.log_level */
if (!(opts & OPT_f)) {
/* close stdin, stdout, stderr.
* close unused descriptors - don't need them. */
bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
}
if (!(opts & OPT_d) && G.log_filename == NULL) {
/* logging to syslog */
openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
logmode = LOGMODE_SYSLOG;
}
//signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
reopen_logfile_to_stderr();
xchdir(G.crontab_dir_name);
log8("crond (busybox "BB_VER") started, log level %d", G.log_level);
rescan_crontab_dir();
write_pidfile(CONFIG_PID_FILE_PATH "/crond.pid");
/* Main loop */
t2 = time(NULL);
rescan = 60;
sleep_time = 60;
for (;;) {
struct stat sbuf;
time_t t1;
long dt;
/* Synchronize to 1 minute, minimum 1 second */
t1 = t2;
sleep(sleep_time - (time(NULL) % sleep_time));
t2 = time(NULL);
dt = (long)t2 - (long)t1;
reopen_logfile_to_stderr();
/*
* The file 'cron.update' is checked to determine new cron
* jobs. The directory is rescanned once an hour to deal
* with any screwups.
*
* Check for time jump. Disparities over an hour either way
* result in resynchronization. A negative disparity
* less than an hour causes us to effectively sleep until we
* match the original time (i.e. no re-execution of jobs that
* have just been run). A positive disparity less than
* an hour causes intermediate jobs to be run, but only once
* in the worst case.
*
* When running jobs, the inequality used is greater but not
* equal to t1, and less then or equal to t2.
*/
if (stat(G.crontab_dir_name, &sbuf) != 0)
sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
if (G.crontab_dir_mtime != sbuf.st_mtime) {
G.crontab_dir_mtime = sbuf.st_mtime;
rescan = 1;
}
if (--rescan == 0) {
rescan = 60;
rescan_crontab_dir();
}
process_cron_update_file();
log5("wakeup dt=%ld", dt);
if (dt < -60 * 60 || dt > 60 * 60) {
bb_error_msg("time disparity of %ld minutes detected", dt / 60);
/* and we do not run any jobs in this case */
} else if (dt > 0) {
/* Usual case: time advances forward, as expected */
flag_starting_jobs(t1, t2);
start_jobs();
sleep_time = 60;
if (check_completions() > 0) {
/* some jobs are still running */
sleep_time = 10;
}
}
/* else: time jumped back, do not run any jobs */
} /* for (;;) */
return 0; /* not reached */
}
