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#include "stddef.h"
#include <__thread.h>
#include <libc/futex.h>
#include <stdatomic.h>
#include <sys/mman.h>
#include <threads.h>
int thrd_join(thrd_t thr, int *res)
{
struct __thread_self *tcb = (struct __thread_self *)thr;
if (tcb == NULL)
return thrd_error;
int state = atomic_load_explicit(&tcb->state, memory_order_seq_cst);
if (state == THREAD_STATE_DETACHED)
return thrd_error; // Cannot join a detached thread
while (atomic_load_explicit(&tcb->state, memory_order_seq_cst) != THREAD_STATE_EXITED) {
int cur = atomic_load_explicit(&tcb->state, memory_order_seq_cst);
int r = __futex_wait((volatile int *)&tcb->state, cur);
if (r < 0)
return thrd_error;
}
if (res) {
*res = tcb->res;
}
atomic_store_explicit(&tcb->state, THREAD_STATE_JOINABLE, memory_order_seq_cst);
__futex_wake((volatile int *)&tcb->state, 1);
if (tcb->map_base == NULL || tcb->map_size == 0)
return thrd_error;
munmap(tcb->map_base, tcb->map_size);
return thrd_success;
}
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