zyfeier commented on PR #8175:
URL: https://github.com/apache/nuttx/pull/8175#issuecomment-1396333791
> @zyfeier
>
> > Increase the sem count when the holder task exit, to avoid lock failure
at next time.
>
> Could you explain the lock failure more concretely? Is it possible to
detect the failure with ostest?
Here is the test case for this issue, need enable
CONFIG_PRIORITY_INHERITANCE and CONFIG_SMP.
This case will finally stop at` nxmutex_lock(&group->tg_joinlock)`, and we
can see no one is holding
this lock, but the semcount value is 0.
```
static pthread_t g_bench_threads;
int priority = 98;
static void bench_spawn_helper(void *args)
{
UNUSED(args);
pthread_exit(NULL);
}
static void thread_test(void)
{
struct sched_param param;
pthread_attr_t attr;
int policy;
pthread_attr_init(&attr);
pthread_getschedparam(0, &policy, ¶m);
param.sched_priority = priority;
pthread_attr_setschedparam(&attr, ¶m);
pthread_create(&g_bench_threads, &attr,
(pthread_startroutine_t)bench_spawn_helper, NULL);
printf("Pthread Create Success!\n");
pthread_attr_destroy(&attr);
}
int main(int argc, FAR char *argv[])
{
int i = 0;
for (;;)
{
thread_test();
pthread_cancel(g_bench_threads);
printf("No.%d -> Test Success!\n", i);
i++;
}
return 0;
}
```
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