mailing list of musl libc

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 #include "pthread_impl.h"
#include <threads.h>

int __pthread_join(pthread_t, void **);

static int __pthread_detach(pthread_t t)
{
	/* Cannot detach a thread that's already exiting */
	if (a_swap(t->exitlock, 1))
		return __pthread_join(t, 0);
	t->detached = 2;
	__unlock(t->exitlock);
	return 0;
}

weak_alias(__pthread_detach, pthread_detach);
weak_alias(__pthread_detach, thrd_detach);