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selftests/timers/posix-timers: Validate overrun after unblock

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When a timer signal is blocked and later unblocked then one signal should
be delivered with the correct number of overruns since the timer was queued.

Validate that behaviour.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Thomas Gleixner 2024-06-10 18:42:12 +02:00 committed by Frederic Weisbecker
parent f924f868ed
commit 73339b82f8
1 changed files with 60 additions and 1 deletions
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61
tools/testing/selftests/timers/posix_timers.c
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@ -540,10 +540,66 @@ static void check_gettime(int which, const char *name)
ksft_test_result(wraps > 1, "check_gettime %s\n", name);
}
static void check_overrun(int which, const char *name)
{
struct timespec start, now;
struct tmrsig tsig = { };
struct itimerspec its;
struct sigaction sa;
struct sigevent sev;
timer_t timerid;
sigset_t set;
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = siginfo_handler;
sigemptyset(&sa.sa_mask);
if (sigaction(SIGUSR1, &sa, NULL))
fatal_error(name, "sigaction()");
/* Block the signal */
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &set, NULL))
fatal_error(name, "sigprocmask(SIG_BLOCK)");
memset(&sev, 0, sizeof(sev));
sev.sigev_notify = SIGEV_SIGNAL;
sev.sigev_signo = SIGUSR1;
sev.sigev_value.sival_ptr = &tsig;
if (timer_create(which, &sev, &timerid))
fatal_error(name, "timer_create()");
/* Start the timer to expire in 100ms and 100ms intervals */
its.it_value.tv_sec = 0;
its.it_value.tv_nsec = 100000000;
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 100000000;
if (timer_settime(timerid, 0, &its, NULL))
fatal_error(name, "timer_settime()");
if (clock_gettime(which, &start))
fatal_error(name, "clock_gettime()");
do {
if (clock_gettime(which, &now))
fatal_error(name, "clock_gettime()");
} while (calcdiff_ns(now, start) < NSECS_PER_SEC);
/* Unblock it, which should deliver a signal */
if (sigprocmask(SIG_UNBLOCK, &set, NULL))
fatal_error(name, "sigprocmask(SIG_UNBLOCK)");
if (timer_delete(timerid))
fatal_error(name, "timer_delete()");
ksft_test_result(tsig.signals == 1 && tsig.overruns == 9,
"check_overrun %s\n", name);
}
int main(int argc, char **argv)
{
ksft_print_header();
ksft_set_plan(15);
ksft_set_plan(18);
ksft_print_msg("Testing posix timers. False negative may happen on CPU execution \n");
ksft_print_msg("based timers if other threads run on the CPU...\n");
@ -574,6 +630,9 @@ int main(int argc, char **argv)
check_gettime(CLOCK_MONOTONIC, "CLOCK_MONOTONIC");
check_gettime(CLOCK_PROCESS_CPUTIME_ID, "CLOCK_PROCESS_CPUTIME_ID");
check_gettime(CLOCK_THREAD_CPUTIME_ID, "CLOCK_THREAD_CPUTIME_ID");
check_overrun(CLOCK_MONOTONIC, "CLOCK_MONOTONIC");
check_overrun(CLOCK_PROCESS_CPUTIME_ID, "CLOCK_PROCESS_CPUTIME_ID");
check_overrun(CLOCK_THREAD_CPUTIME_ID, "CLOCK_THREAD_CPUTIME_ID");
ksft_finished();
}