[LTP] pthread_detach/1-2: Fix race condition between thread exit and join

[linuxtestproject.agent@gmail.com]

Hi Wei,

On Fri, 8 May 2026 10:00:58 +0000, Wei Gao wrote:
> pthread_detach/1-2: Fix race condition between thread exit and join

> +       /* Wait for the main thread to allow exit */
> +       do {
> +               ret = sem_wait(&sem_exit);
> +       }
> +       while ((ret == -1) && (errno == EINTR));

> +       /* Allow the thread to exit */
> +       do {
> +               ret = sem_post(&sem_exit);
> +       }
> +       while ((ret == -1) && (errno == EINTR));

> +       sem_destroy(&sem_exit);

Correct fix. The second semaphore ensures the child is still alive when
pthread_join() is called, eliminating the race.

Reviewed-by: LTP AI Reviewer <ltp-ai@noreply.github.com>

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- 1-2.c: uses testfrmw.h harness with test_main() instead of posixtest.h
  and main() — not introduced by this patch.

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