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 <[email protected]>
---
tools/testing/selftests/timers/posix_timers.c | 61 +++++++++++++++++++++++++-
1 file changed, 60 insertions(+), 1 deletion(-)
--- a/tools/testing/selftests/timers/posix_timers.c
+++ b/tools/testing/selftests/timers/posix_timers.c
@@ -540,10 +540,66 @@ static void check_gettime(int which, con
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();
}