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changed to fallback to ITIMER_REAL if ITIMER_VIRTUAL fails. fix for WSL

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hyunghwan.chung 2019-10-12 14:55:37 +00:00
parent 277dc64ac4
commit 5d1d42f608
1 changed files with 33 additions and 2 deletions
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35
moo/lib/std.c
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@ -3296,6 +3296,10 @@ static int unset_signal_handler (int sig)
return 0;
}
static int is_signal_handler_set (int sig)
{
return !!g_sig_state[sig].handler;
}
#endif
/* ========================================================================= */
@ -3561,7 +3565,24 @@ static MOO_INLINE void start_ticker (void)
itv.it_interval.tv_usec = MOO_TICKER_INTERVAL_USECS;
itv.it_value.tv_sec = 0;
itv.it_value.tv_usec = MOO_TICKER_INTERVAL_USECS;
setitimer (ITIMER_VIRTUAL, &itv, MOO_NULL);
if (setitimer(ITIMER_VIRTUAL, &itv, MOO_NULL) == -1)
{
/* WSL supports ITIMER_VIRTUAL only as of windows 10.0.18362.413.
the following is a fallback which will get */
unset_signal_handler (SIGVTALRM);
if (set_signal_handler(SIGALRM, swproc_all_moos, SA_RESTART) >= 0)
{
/* i double the interval as ITIMER_REAL is against the wall clock.
* if the underlying system is under heavy load, some signals
* will get lost */
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = MOO_TICKER_INTERVAL_USECS * 2;
itv.it_value.tv_sec = 0;
itv.it_value.tv_usec = MOO_TICKER_INTERVAL_USECS * 2;
setitimer(ITIMER_REAL, &itv, MOO_NULL);
}
}
}
}
@ -3569,7 +3590,7 @@ static MOO_INLINE void stop_ticker (void)
{
/* ignore the signal fired by the activated timer.
* unsetting the signal may cause the program to terminate(default action) */
if (set_signal_handler(SIGVTALRM, SIG_IGN, 0) >= 0)
if (is_signal_handler_set(SIGVTALRM) && set_signal_handler(SIGVTALRM, SIG_IGN, 0) >= 0)
{
struct itimerval itv;
itv.it_interval.tv_sec = 0;
@ -3578,6 +3599,16 @@ static MOO_INLINE void stop_ticker (void)
itv.it_value.tv_usec = 0;
setitimer (ITIMER_VIRTUAL, &itv, MOO_NULL);
}
if (is_signal_handler_set(SIGALRM) && set_signal_handler(SIGALRM, SIG_IGN, 0) >= 0)
{
struct itimerval itv;
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = 0; /* make setitimer() one-shot only */
itv.it_value.tv_usec = 0;
setitimer (ITIMER_REAL, &itv, MOO_NULL);
}
}
#else