void
linux_e_lwp_exit(struct lwp *l)
{
struct linux_emuldata *led;
struct linux_sys_futex_args cup;
register_t retval;
int error, zero = 0;
led = l->l_emuldata;
if (led->led_clear_tid == NULL) {
return;
}
/* Emulate LINUX_CLONE_CHILD_CLEARTID */
error = copyout(&zero, led->led_clear_tid, sizeof(zero));
#ifdef DEBUG_LINUX
if (error != 0)
printf("%s: cannot clear TID\n", __func__);
#endif
SCARG(&cup, uaddr) = led->led_clear_tid;
SCARG(&cup, op) = LINUX_FUTEX_WAKE;
SCARG(&cup, val) = 0x7fffffff; /* Awake everyone */
SCARG(&cup, timeout) = NULL;
SCARG(&cup, uaddr2) = NULL;
SCARG(&cup, val3) = 0;
if ((error = linux_sys_futex(curlwp, &cup, &retval)) != 0)
printf("%s: linux_sys_futex failed\n", __func__);
release_futexes(l);
led = l->l_emuldata;
l->l_emuldata = NULL;
kmem_free(led, sizeof(*led));
}
void
linux_thread_detach(struct thread *td)
{
struct linux_sys_futex_args cup;
struct linux_emuldata *em;
int *child_clear_tid;
int error;
em = em_find(td);
KASSERT(em != NULL, ("thread_detach: emuldata not found.\n"));
LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid);
release_futexes(td, em);
child_clear_tid = em->child_clear_tid;
if (child_clear_tid != NULL) {
LINUX_CTR2(thread_detach, "thread(%d) %p",
em->em_tid, child_clear_tid);
error = suword32(child_clear_tid, 0);
if (error != 0)
return;
cup.uaddr = child_clear_tid;
cup.op = LINUX_FUTEX_WAKE;
cup.val = 1; /* wake one */
cup.timeout = NULL;
cup.uaddr2 = NULL;
cup.val3 = 0;
error = linux_sys_futex(td, &cup);
/*
* this cannot happen at the moment and if this happens it
* probably means there is a user space bug
*/
if (error != 0)
linux_msg(td, "futex stuff in thread_detach failed.");
}
}