mailing list of musl libc

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 #include <threads.h>

int __pthread_key_create(tss_t *k, void (*dtor)(void *));

int tss_create(tss_t *tss, tss_dtor_t dtor)
{
	/* Different error returns are possible. C glues them together into
	   just failure notification. Can't be optimized to a tail call,
	   unless thrd_error equals EAGAIN. */
	return __pthread_key_create(tss, dtor) ? thrd_error : thrd_success;
}